diff --git a/package.json b/package.json
index f3ea4c9..ac59c3c 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
     "dev": "ts-node src/cli/index.ts",
     "server": "ts-node src/server/index.ts",
     "server:build": "node dist/server/index.js",
+    "build:frontend": "tsc -p src/server/public/tsconfig.json",
     "test": "jest",
     "lint": "eslint src/**/*.ts",
     "prepublishOnly": "npm run build"
diff --git a/src/server/public/app.js b/src/server/public/app.js
index fc9a159..fabd637 100644
--- a/src/server/public/app.js
+++ b/src/server/public/app.js
@@ -1,268 +1,324 @@
+"use strict";
+// ── Types ────────────────────────────────────────────
+// ── State ────────────────────────────────────────────
 let authToken = sessionStorage.getItem('authToken');
-let selectedFilePath = '';
-let currentConfig = {};
-
+let selectedFilePath = null;
+const sseMap = new Map();
+let pollTimer = null;
+// ── DOM helpers ───────────────────────────────────────
+const $ = (sel) => document.querySelector(sel);
+const $$ = (sel) => document.querySelectorAll(sel);
+const el = (id) => document.getElementById(id);
+// ── API ───────────────────────────────────────────────
 function apiHeaders() {
-  const h = { 'Content-Type': 'application/json' };
-  if (authToken) h['Authorization'] = `Basic ${authToken}`;
-  return h;
+    const h = { 'Content-Type': 'application/json' };
+    if (authToken)
+        h['Authorization'] = `Basic ${authToken}`;
+    return h;
 }
-
 async function api(method, url, body) {
-  const res = await fetch(url, {
-    method,
-    headers: apiHeaders(),
-    body: body ? JSON.stringify(body) : undefined
-  });
-  if (res.status === 401) {
+    const res = await fetch(url, {
+        method,
+        headers: apiHeaders(),
+        body: body ? JSON.stringify(body) : undefined,
+    });
+    if (res.status === 401) {
+        sessionStorage.removeItem('authToken');
+        authToken = null;
+        showLoginScreen();
+        throw new Error('Unauthorized');
+    }
+    return res;
+}
+async function apiJson(method, url, body) {
+    const res = await api(method, url, body);
+    const data = await res.json();
+    if (!res.ok)
+        throw new Error(data.error || 'Request failed');
+    return data;
+}
+// ── Screen switching ──────────────────────────────────
+function showLoginScreen() {
+    el('login-screen').classList.remove('hidden');
+    el('main-screen').classList.add('hidden');
+}
+function showMainScreen() {
+    el('login-screen').classList.add('hidden');
+    el('main-screen').classList.remove('hidden');
+}
+// ── Tab navigation ────────────────────────────────────
+function switchTab(name) {
+    $$('button.tab').forEach(b => b.classList.remove('active'));
+    document.querySelector(`button.tab[data-tab="${name}"]`)?.classList.add('active');
+    $$('.tab-content').forEach(c => c.classList.remove('active'));
+    const pane = document.getElementById(name);
+    if (pane)
+        pane.classList.add('active');
+    if (name === 'dashboard')
+        loadJobs();
+    if (name === 'files')
+        loadFilesList();
+}
+$$('button.tab').forEach(btn => {
+    btn.addEventListener('click', () => switchTab(btn.dataset.tab || ''));
+});
+// ── Mini tabs (video source) ──────────────────────────
+$$('button.tab-mini').forEach(btn => {
+    btn.addEventListener('click', () => {
+        $$('button.tab-mini').forEach(b => b.classList.remove('active'));
+        btn.classList.add('active');
+        $$('.src-panel').forEach(p => p.classList.remove('active'));
+        const panel = document.getElementById('src-' + (btn.dataset.src || ''));
+        if (panel)
+            panel.classList.add('active');
+    });
+});
+// ── Login ─────────────────────────────────────────────
+el('login-form').addEventListener('submit', async (e) => {
+    e.preventDefault();
+    const username = el('login-username').value;
+    const password = el('login-password').value;
+    try {
+        const res = await fetch('/api/auth/login', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ username, password }),
+        });
+        const data = await res.json();
+        if (data.authenticated) {
+            authToken = data.token;
+            if (authToken)
+                sessionStorage.setItem('authToken', authToken);
+            showMainScreen();
+            initApp();
+        }
+        else {
+            el('login-error').textContent = data.error;
+            el('login-error').classList.remove('hidden');
+        }
+    }
+    catch {
+        el('login-error').textContent = 'Connection failed';
+        el('login-error').classList.remove('hidden');
+    }
+});
+el('logout-btn').addEventListener('click', () => {
     sessionStorage.removeItem('authToken');
     authToken = null;
-    showLogin();
-    throw new Error('Unauthorized');
-  }
-  return res;
+    sseMap.forEach(s => s.close());
+    sseMap.clear();
+    if (pollTimer)
+        clearInterval(pollTimer);
+    showLoginScreen();
+});
+// ── Utils ─────────────────────────────────────────────
+function escapeHtml(str) {
+    if (!str)
+        return '';
+    return String(str)
+        .replace(/&/g, '&')
+        .replace(/</g, '&lt;')
+        .replace(/>/g, '&gt;')
+        .replace(/"/g, '&quot;');
 }
-
-async function apiJson(method, url, body) {
-  const res = await api(method, url, body);
-  const data = await res.json();
-  if (!res.ok) throw new Error(data.error || 'Request failed');
-  return data;
-}
-
-// Login
-function showLogin() {
-  document.getElementById('login-screen').classList.remove('hidden');
-  document.getElementById('main-screen').classList.add('hidden');
-  document.getElementById('login-error').classList.add('hidden');
-}
-
-function showMain() {
-  document.getElementById('login-screen').classList.add('hidden');
-  document.getElementById('main-screen').classList.remove('hidden');
-}
-
-document.getElementById('login-form').addEventListener('submit', async (e) => {
-  e.preventDefault();
-  const username = document.getElementById('login-username').value;
-  const password = document.getElementById('login-password').value;
-  try {
-    const res = await fetch('/api/auth/login', {
-      method: 'POST',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({ username, password })
-    });
-    const data = await res.json();
-    if (data.authenticated) {
-      authToken = data.token;
-      sessionStorage.setItem('authToken', authToken);
-      showMain();
-      initApp();
-    } else {
-      document.getElementById('login-error').textContent = data.error;
-      document.getElementById('login-error').classList.remove('hidden');
+function formatSize(bytes) {
+    if (!bytes)
+        return '0 B';
+    const units = ['B', 'KB', 'MB', 'GB'];
+    let i = 0;
+    let size = bytes;
+    while (size >= 1024 && i < units.length - 1) {
+        size /= 1024;
+        i++;
     }
-  } catch (err) {
-    document.getElementById('login-error').textContent = 'Connection failed';
-    document.getElementById('login-error').classList.remove('hidden');
-  }
-});
-
-document.getElementById('logout-btn').addEventListener('click', () => {
-  sessionStorage.removeItem('authToken');
-  authToken = null;
-  showLogin();
-});
-
-// Tab navigation
-document.querySelectorAll('button.tab').forEach(btn => {
-  btn.addEventListener('click', () => {
-    document.querySelectorAll('button.tab').forEach(b => b.classList.remove('active'));
-    btn.classList.add('active');
-    document.querySelectorAll('.tab-content').forEach(c => c.classList.remove('active'));
-    document.getElementById(btn.dataset.tab).classList.add('active');
-    if (btn.dataset.tab === 'dashboard') loadJobs();
-    if (btn.dataset.tab === 'files') loadFilesList();
-  });
-});
-
-// Mini tabs (video source)
-document.querySelectorAll('button.tab-mini').forEach(btn => {
-  btn.addEventListener('click', () => {
-    document.querySelectorAll('button.tab-mini').forEach(b => b.classList.remove('active'));
-    btn.classList.add('active');
-    document.querySelectorAll('.src-panel').forEach(p => p.classList.remove('active'));
-    document.getElementById('src-' + btn.dataset.src).classList.add('active');
-  });
-});
-
-// File upload
-document.getElementById('video-upload').addEventListener('change', () => {
-  const file = document.getElementById('video-upload').files[0];
-  if (file) selectedFilePath = null;
-});
-
-// Refresh browse files
-document.getElementById('refresh-files').addEventListener('click', loadBrowseFiles);
+    return `${size.toFixed(1)} ${units[i]}`;
+}
+// ── Browse files (for New Job) ────────────────────────
 async function loadBrowseFiles() {
-  try {
-    const data = await apiJson('GET', '/api/files');
-    const sel = document.getElementById('video-select');
-    sel.innerHTML = '<option value="">-- Select file --</option>';
-    data.files.forEach(f => {
-      sel.innerHTML += `<option value="${f.filePath}">${f.filename} (${formatSize(f.size)})</option>`;
-    });
-  } catch (err) {
-    console.error(err);
-  }
+    try {
+        const data = await apiJson('GET', '/api/files');
+        const sel = el('video-select');
+        sel.innerHTML = '<option value="">-- Select file --</option>';
+        data.files.forEach(f => {
+            const opt = document.createElement('option');
+            opt.value = f.filePath;
+            opt.textContent = `${f.filename} (${formatSize(f.size)})`;
+            sel.appendChild(opt);
+        });
+    }
+    catch (err) {
+        console.error(err);
+    }
 }
-
-document.getElementById('video-select').addEventListener('change', (e) => {
-  if (e.target.value) selectedFilePath = e.target.value;
+el('refresh-files').addEventListener('click', loadBrowseFiles);
+el('video-select').addEventListener('change', function () {
+    if (this.value)
+        selectedFilePath = this.value;
 });
-
-// YouTube download
-document.getElementById('download-url').addEventListener('click', async () => {
-  const url = document.getElementById('youtube-url').value;
-  if (!url) return;
-  const status = document.getElementById('download-status');
-  status.textContent = 'Downloading...';
-  status.className = 'status';
-  try {
-    const data = await apiJson('POST', '/api/files/youtube', { url });
-    status.textContent = `Downloaded: ${data.filename}`;
-    status.className = 'status success';
-    selectedFilePath = data.filePath;
-    document.getElementById('video-select').innerHTML += `<option value="${data.filePath}" selected>${data.filename}</option>`;
-  } catch (err) {
-    status.textContent = `Error: ${err.message}`;
-    status.className = 'status error';
-  }
+// ── File upload ───────────────────────────────────────
+el('video-upload').addEventListener('change', function () {
+    if (this.files?.length)
+        selectedFilePath = null; // will upload on submit
 });
-
-// New job form
-document.getElementById('new-job-form').addEventListener('submit', async (e) => {
-  e.preventDefault();
-  if (!selectedFilePath) {
-    const fileEl = document.getElementById('video-upload');
-    if (fileEl.files.length > 0) {
-      const formData = new FormData();
-      formData.append('video', fileEl.files[0]);
-      try {
-        const res = await fetch('/api/files/upload', { method: 'POST', headers: { Authorization: `Basic ${authToken}` }, body: formData });
-        const data = await res.json();
-        if (!res.ok) throw new Error(data.error || 'Upload failed');
-        selectedFilePath = data.filePath;
-      } catch (err) {
-        alert('Upload error: ' + err.message);
+// ── YouTube download ──────────────────────────────────
+el('download-url').addEventListener('click', async () => {
+    const url = el('youtube-url').value;
+    if (!url)
         return;
-      }
-    } else {
-      alert('Please select a video file or source');
-      return;
+    const status = el('download-status');
+    status.textContent = 'Downloading...';
+    status.className = 'status';
+    try {
+        const data = await apiJson('POST', '/api/files/youtube', { url });
+        status.textContent = `Downloaded: ${data.filename}`;
+        status.className = 'status success';
+        selectedFilePath = data.filePath;
+        const sel = el('video-select');
+        const opt = document.createElement('option');
+        opt.value = data.filePath;
+        opt.textContent = data.filename;
+        opt.selected = true;
+        sel.appendChild(opt);
+    }
+    catch (err) {
+        status.textContent = `Error: ${err.message}`;
+        status.className = 'status error';
     }
-  }
-
-  const fd = new FormData(e.target);
-  const config = {};
-  for (const [key, val] of fd.entries()) {
-    if (key === '') continue;
-    if (val === 'on') config[key] = true;
-    else if (val === 'off') config[key] = false;
-    else if (!isNaN(val) && val !== '') config[key] = parseFloat(val);
-    else config[key] = val;
-  }
-
-  const outputOptions = {
-    audio: fd.get('output-audio') === 'on',
-    subtitles: fd.get('output-subtitles') === 'on',
-    muxed: fd.get('output-muxed') === 'on'
-  };
-
-  // Build config with vision/tts providers
-  if (config.visionProvider) {
-    config.visionProviders = {};
-    config.visionProviders[config.visionProvider] = {
-      model: config.visionModel || 'gpt-4o',
-      maxTokens: config.visionMaxTokens ? parseInt(config.visionMaxTokens) : 300
-    };
-  }
-  if (config.ttsProvider) {
-    config.ttsProviders = {};
-    config.ttsProviders[config.ttsProvider] = {
-      model: config.ttsModel || 'tts-1',
-      voice: config.ttsVoice || 'alloy'
-    };
-  }
-
-  delete config.visionModel;
-  delete config.visionMaxTokens;
-  delete config.ttsModel;
-  delete config['output-audio'];
-  delete config['output-subtitles'];
-  delete config['output-muxed'];
-
-  try {
-    const data = await apiJson('POST', '/api/jobs', { videoPath: selectedFilePath, config, outputOptions });
-    await apiJson('POST', `/api/jobs/${data.job.id}/start`);
-    selectedFilePath = '';
-    document.getElementById('video-upload').value = '';
-    document.getElementById('new-job-form').reset();
-    document.querySelector('.tab[data-tab="dashboard"]').click();
-    loadJobs();
-  } catch (err) {
-    alert('Error creating job: ' + err.message);
-  }
 });
-
-// Load jobs
+// ── New Job form ──────────────────────────────────────
+el('new-job-form').addEventListener('submit', async (e) => {
+    e.preventDefault();
+    if (!selectedFilePath) {
+        const fileEl = el('video-upload');
+        if (fileEl.files?.length) {
+            const formData = new FormData();
+            formData.append('video', fileEl.files[0]);
+            try {
+                const headers = {};
+                if (authToken)
+                    headers['Authorization'] = `Basic ${authToken}`;
+                const res = await fetch('/api/files/upload', { method: 'POST', headers, body: formData });
+                const data = await res.json();
+                if (!res.ok)
+                    throw new Error(data.error || 'Upload failed');
+                selectedFilePath = data.filePath;
+            }
+            catch (err) {
+                alert('Upload error: ' + err.message);
+                return;
+            }
+        }
+        else {
+            alert('Please select a video file or source');
+            return;
+        }
+    }
+    const fd = new FormData(e.target);
+    const config = {};
+    for (const [key, val] of fd.entries()) {
+        if (key === '')
+            continue;
+        if (val === 'on')
+            config[key] = true;
+        else if (val === 'off')
+            config[key] = false;
+        else if (!isNaN(val) && val !== '')
+            config[key] = parseFloat(val);
+        else
+            config[key] = val;
+    }
+    const outputOptions = {
+        audio: fd.get('output-audio') === 'on',
+        subtitles: fd.get('output-subtitles') === 'on',
+        muxed: fd.get('output-muxed') === 'on',
+    };
+    if (config.visionProvider) {
+        const vp = {};
+        vp[config.visionProvider] = {
+            model: config.visionModel || 'gpt-4o',
+            maxTokens: config.visionMaxTokens ? parseInt(config.visionMaxTokens) : 300,
+        };
+        config.visionProviders = vp;
+    }
+    if (config.ttsProvider) {
+        const tp = {};
+        tp[config.ttsProvider] = {
+            model: config.ttsModel || 'tts-1',
+            voice: config.ttsVoice || 'alloy',
+        };
+        config.ttsProviders = tp;
+    }
+    delete config.visionModel;
+    delete config.visionMaxTokens;
+    delete config.ttsModel;
+    delete config['output-audio'];
+    delete config['output-subtitles'];
+    delete config['output-muxed'];
+    try {
+        const data = await apiJson('POST', '/api/jobs', {
+            videoPath: selectedFilePath,
+            config,
+            outputOptions,
+        });
+        await apiJson('POST', `/api/jobs/${data.job.id}/start`);
+        selectedFilePath = null;
+        el('video-upload').value = '';
+        el('new-job-form').reset();
+        switchTab('dashboard');
+    }
+    catch (err) {
+        alert('Error creating job: ' + err.message);
+    }
+});
+// ── Job list & rendering ──────────────────────────────
 async function loadJobs() {
-  try {
-    const data = await apiJson('GET', '/api/jobs');
-    renderJobs(data.jobs);
-    data.jobs.forEach(j => {
-      if (j.status === 'processing' || j.status === 'queued') {
-        connectSSE(j.id);
-      }
-    });
-  } catch (err) {
-    console.error(err);
-  }
+    try {
+        const data = await apiJson('GET', '/api/jobs');
+        renderJobs(data.jobs);
+        data.jobs.forEach(j => {
+            if (j.status === 'processing' || j.status === 'queued') {
+                connectSSE(j.id);
+            }
+        });
+    }
+    catch (err) {
+        console.error(err);
+    }
 }
-
 function renderJobs(jobs) {
-  const container = document.getElementById('jobs-list');
-  if (!jobs.length) {
-    container.innerHTML = '<p class="empty">No jobs yet. Create one from the "New Job" tab.</p>';
-    return;
-  }
-
-  container.innerHTML = jobs.map(j => {
-    const segs = JSON.parse(j.segments || '[]');
-    const progressClass = j.status === 'completed' ? 'completed' : j.status === 'failed' ? 'failed' : '';
-    const downloads = [];
-    if (j.status === 'completed') {
-      if (j.output_audio) downloads.push(`<a href="/api/jobs/${j.id}/download/audio" download>Audio</a>`);
-      if (j.output_subtitles_srt) downloads.push(`<a href="/api/jobs/${j.id}/download/subtitles?format=srt" download>SRT</a>`);
-      if (j.output_subtitles_vtt) downloads.push(`<a href="/api/jobs/${j.id}/download/subtitles?format=vtt" download>VTT</a>`);
-      if (j.output_muxed) downloads.push(`<a href="/api/jobs/${j.id}/download/muxed" download>Muxed</a>`);
+    const container = el('jobs-list');
+    if (!jobs.length) {
+        container.innerHTML = '<p class="empty">No jobs yet. Create one from the "New Job" tab.</p>';
+        return;
     }
-
-    let actions = '';
-    if (j.status === 'pending' || j.status === 'queued') {
-      actions += `<button class="start-job" data-id="${j.id}">Start</button>`;
-    }
-    if (j.status === 'processing') {
-      actions += `<button class="pause-job" data-id="${j.id}">Pause</button>`;
-    }
-    if (j.status === 'failed' || j.status === 'paused' || j.status === 'cancelled') {
-      actions += `<button class="restart-job" data-id="${j.id}">Restart</button>`;
-    }
-    if (j.status !== 'processing') {
-      actions += `<button class="delete-job danger" data-id="${j.id}">Delete</button>`;
-    }
-
-    return `
+    container.innerHTML = jobs.map(j => {
+        const segs = JSON.parse(j.segments || '[]');
+        const progressClass = j.status === 'completed' ? 'completed' : j.status === 'failed' ? 'failed' : '';
+        const downloads = [];
+        if (j.status === 'completed') {
+            if (j.output_audio)
+                downloads.push(`<a href="/api/jobs/${j.id}/download/audio" download>Audio</a>`);
+            if (j.output_subtitles_srt)
+                downloads.push(`<a href="/api/jobs/${j.id}/download/subtitles?format=srt" download>SRT</a>`);
+            if (j.output_subtitles_vtt)
+                downloads.push(`<a href="/api/jobs/${j.id}/download/subtitles?format=vtt" download>VTT</a>`);
+            if (j.output_muxed)
+                downloads.push(`<a href="/api/jobs/${j.id}/download/muxed" download>Muxed</a>`);
+        }
+        let actions = '';
+        if (j.status === 'pending' || j.status === 'queued') {
+            actions += `<button class="act-start" data-id="${j.id}">Start</button>`;
+        }
+        if (j.status === 'processing') {
+            actions += `<button class="act-pause" data-id="${j.id}">Pause</button>`;
+        }
+        if (j.status === 'failed' || j.status === 'paused' || j.status === 'cancelled') {
+            actions += `<button class="act-restart" data-id="${j.id}">Restart</button>`;
+        }
+        if (j.status !== 'processing') {
+            actions += `<button class="act-delete danger" data-id="${j.id}">Delete</button>`;
+        }
+        return `
       <div class="job-card" data-id="${j.id}">
         <div class="job-card-header">
           <h3>${escapeHtml(j.video_filename)}</h3>
@@ -272,7 +328,7 @@ function renderJobs(jobs) {
         <div class="progress-bar"><div class="progress-fill ${progressClass}" style="width:${j.progress}%"></div></div>
         <div class="job-meta">
           <span>${Math.round(j.progress)}%</span>
-          <span>Index: ${j.current_index}/${j.total_units}</span>
+          <span>Idx: ${j.current_index}/${j.total_units}</span>
           <span>${new Date(j.created_at).toLocaleString()}</span>
         </div>
         ${j.error ? `<div class="error-msg">${escapeHtml(j.error)}</div>` : ''}
@@ -282,243 +338,223 @@ function renderJobs(jobs) {
         </div>
         <button class="toggle-detail" data-id="${j.id}">${segs.length} segments</button>
       </div>`;
-  }).join('');
-
-  // Wire up buttons
-  container.querySelectorAll('.start-job').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id, 'start')));
-  container.querySelectorAll('.pause-job').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id, 'pause')));
-  container.querySelectorAll('.restart-job').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id, 'restart')));
-  container.querySelectorAll('.delete-job').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id, 'delete')));
-  container.querySelectorAll('.toggle-detail').forEach(b => b.addEventListener('click', () => {
-    const detail = container.querySelector(`.job-detail[data-id="${b.dataset.id}"]`);
-    detail.classList.toggle('open');
-    b.textContent = detail.classList.contains('open') ? 'Hide segments' : `${JSON.parse((jobs.find(j => j.id === b.dataset.id) || {}).segments || '[]').length} segments`;
-  }));
+    }).join('');
+    // Wire up action buttons
+    container.querySelectorAll('.act-start').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id || '', 'start')));
+    container.querySelectorAll('.act-pause').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id || '', 'pause')));
+    container.querySelectorAll('.act-restart').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id || '', 'restart')));
+    container.querySelectorAll('.act-delete').forEach(b => b.addEventListener('click', () => handleJobAction(b.dataset.id || '', 'delete')));
+    container.querySelectorAll('.toggle-detail').forEach(b => {
+        b.addEventListener('click', () => {
+            const jobId = b.dataset.id || '';
+            const detail = container.querySelector(`.job-detail[data-id="${jobId}"]`);
+            if (!detail)
+                return;
+            detail.classList.toggle('open');
+            const job = jobs.find(j => j.id === jobId);
+            const segs = job ? JSON.parse(job.segments || '[]') : [];
+            b.textContent = detail.classList.contains('open') ? 'Hide segments' : `${segs.length} segments`;
+        });
+    });
 }
-
 async function handleJobAction(id, action) {
-  const method = action === 'delete' ? 'DELETE' : 'POST';
-  const url = `/api/jobs/${id}${action === 'delete' ? '' : '/' + action}`;
-  try {
-    await api(method, url);
-    loadJobs();
-  } catch (err) {
-    alert(`Error: ${err.message}`);
-  }
+    const method = action === 'delete' ? 'DELETE' : 'POST';
+    const url = `/api/jobs/${id}${action === 'delete' ? '' : '/' + action}`;
+    try {
+        await api(method, url);
+        loadJobs();
+    }
+    catch (err) {
+        alert(`Error: ${err.message}`);
+    }
 }
-
-// Jobs refresh
-document.getElementById('refresh-jobs').addEventListener('click', loadJobs);
-
-// Auto-refresh jobs
-let jobsInterval;
-function startJobsPolling() {
-  jobsInterval = setInterval(loadJobs, 5000);
+el('refresh-jobs').addEventListener('click', loadJobs);
+// ── Polling ───────────────────────────────────────────
+function startPolling() {
+    if (pollTimer)
+        return;
+    pollTimer = window.setInterval(loadJobs, 5000);
 }
-function stopJobsPolling() {
-  clearInterval(jobsInterval);
+// ── SSE live progress ─────────────────────────────────
+function connectSSE(jobId) {
+    if (sseMap.has(jobId))
+        return;
+    const es = new EventSource(`/api/jobs/${jobId}/progress?token=${encodeURIComponent(authToken)}`);
+    es.onmessage = (event) => {
+        const data = JSON.parse(event.data);
+        updateJobCard(jobId, data);
+        if (data.status === 'completed' || data.status === 'failed' || data.status === 'cancelled') {
+            es.close();
+            sseMap.delete(jobId);
+        }
+    };
+    es.onerror = () => {
+        es.close();
+        sseMap.delete(jobId);
+    };
+    sseMap.set(jobId, es);
 }
-
-// Settings
+function updateJobCard(jobId, data) {
+    const card = document.querySelector(`.job-card[data-id="${jobId}"]`);
+    if (!card)
+        return;
+    const badge = card.querySelector('.status-badge');
+    if (badge) {
+        badge.className = `status-badge status-${data.status}`;
+        badge.textContent = data.status;
+    }
+    const fill = card.querySelector('.progress-fill');
+    if (fill) {
+        fill.style.width = data.progress + '%';
+        fill.className = 'progress-fill';
+        if (data.status === 'completed')
+            fill.classList.add('completed');
+        else if (data.status === 'failed')
+            fill.classList.add('failed');
+    }
+    const metaSpans = card.querySelectorAll('.job-meta span');
+    if (metaSpans[0])
+        metaSpans[0].textContent = Math.round(data.progress) + '%';
+    if (metaSpans[1])
+        metaSpans[1].textContent = `Idx: ${data.currentIndex}/${data.totalUnits}`;
+    const log = card.querySelector('.segment-log');
+    if (log && data.segments) {
+        log.innerHTML = data.segments.map(s => `<div class="segment-entry"><span class="segment-time">[${s.startTime.toFixed(1)}s]</span> ${escapeHtml(s.description)}</div>`).join('');
+    }
+    const toggleBtn = card.querySelector('.toggle-detail');
+    if (toggleBtn && data.segments) {
+        toggleBtn.textContent = `${data.segments.length} segments`;
+    }
+}
+// ── Settings ──────────────────────────────────────────
 async function loadSettings() {
-  try {
-    const data = await apiJson('GET', '/api/config');
-    const container = document.getElementById('settings-fields');
-    const config = data.config || {};
-    currentConfig = config;
-    let html = '';
-    for (const [key, value] of Object.entries(config)) {
-      html += `<label>${key} <input type="text" name="${key}" value="${escapeHtml(String(value))}"></label>`;
+    try {
+        const data = await apiJson('GET', '/api/config');
+        const container = el('settings-fields');
+        const entries = Object.entries(data.config || {});
+        if (!entries.length) {
+            container.innerHTML = '<p class="empty">No custom settings yet. Settings from .env are used as defaults.</p>';
+            return;
+        }
+        container.innerHTML = entries.map(([key, value]) => `<label>${escapeHtml(key)} <input type="text" name="${escapeHtml(key)}" value="${escapeHtml(String(value))}"></label>`).join('');
     }
-    if (!Object.keys(config).length) {
-      html = '<p class="empty">No custom settings yet. Settings from .env are used as defaults.</p>';
+    catch (err) {
+        console.error(err);
     }
-    container.innerHTML = html;
-  } catch (err) {
-    console.error(err);
-  }
 }
-
-document.getElementById('settings-form').addEventListener('submit', async (e) => {
-  e.preventDefault();
-  const fd = new FormData(e.target);
-  const config = {};
-  for (const [key, val] of fd.entries()) {
-    config[key] = val;
-  }
-  try {
-    await apiJson('PUT', '/api/config', config);
-    alert('Settings saved');
-  } catch (err) {
-    alert('Error: ' + err.message);
-  }
+el('settings-form').addEventListener('submit', async (e) => {
+    e.preventDefault();
+    const fd = new FormData(e.target);
+    const config = {};
+    for (const [key, val] of fd.entries()) {
+        config[key] = val;
+    }
+    try {
+        await apiJson('PUT', '/api/config', config);
+        alert('Settings saved');
+    }
+    catch (err) {
+        alert('Error: ' + err.message);
+    }
 });
-
-// Files list
+// ── Files list ────────────────────────────────────────
 let selectedFiles = new Set();
 async function loadFilesList() {
-  try {
-    const data = await apiJson('GET', '/api/files');
-    const tbody = document.querySelector('#files-table tbody');
-    tbody.innerHTML = data.files.map(f => `
+    try {
+        const data = await apiJson('GET', '/api/files');
+        const tbody = document.querySelector('#files-table tbody');
+        tbody.innerHTML = data.files.map(f => `
       <tr>
         <td><input type="checkbox" class="file-checkbox" data-path="${escapeHtml(f.filePath)}"></td>
         <td>${escapeHtml(f.filename)}</td>
         <td>${formatSize(f.size)}</td>
       </tr>
     `).join('');
-
-    document.querySelectorAll('.file-checkbox').forEach(cb => {
-      cb.addEventListener('change', () => updateFileSelection());
-    });
-  } catch (err) {
-    console.error(err);
-  }
+        tbody.querySelectorAll('.file-checkbox').forEach(cb => {
+            cb.addEventListener('change', updateFileSelection);
+        });
+    }
+    catch (err) {
+        console.error(err);
+    }
 }
-
 function updateFileSelection() {
-  selectedFiles.clear();
-  document.querySelectorAll('.file-checkbox:checked').forEach(cb => {
-    selectedFiles.add(cb.dataset.path);
-  });
-  document.getElementById('delete-selected-files').disabled = selectedFiles.size === 0;
+    selectedFiles.clear();
+    document.querySelectorAll('.file-checkbox:checked').forEach(cb => {
+        if (cb.dataset.path)
+            selectedFiles.add(cb.dataset.path);
+    });
+    el('delete-selected-files').disabled = selectedFiles.size === 0;
 }
-
-document.getElementById('select-all-files').addEventListener('change', (e) => {
-  document.querySelectorAll('.file-checkbox').forEach(cb => { cb.checked = e.target.checked; });
-  updateFileSelection();
+el('select-all-files').addEventListener('change', function () {
+    document.querySelectorAll('.file-checkbox').forEach(cb => {
+        cb.checked = this.checked;
+    });
+    updateFileSelection();
 });
-
-document.getElementById('delete-selected-files').addEventListener('click', async () => {
-  if (!confirm(`Delete ${selectedFiles.size} file(s)?`)) return;
-  for (const path of selectedFiles) {
-    // Files are served from uploads dir, delete via fs on server... 
-    // Not implementing server-side file deletion for now
-  }
-  alert('File deletion not yet implemented');
-});
-
-document.getElementById('refresh-files-list').addEventListener('click', loadFilesList);
-
-// Pre-fill new job form with config defaults
-async function loadConfigDefaults() {
-  try {
-    const data = await apiJson('GET', '/api/config');
-    const config = data.config || {};
-
-    if (config.visionProvider) {
-      const sel = document.querySelector('[name="visionProvider"]');
-      sel.innerHTML = '<option value="openai">OpenAI</option><option value="gemini">Gemini</option><option value="ollama">Ollama</option><option value="openrouter">OpenRouter</option>';
-      sel.value = config.visionProvider;
-    }
-    if (config.visionModel) document.querySelector('[name="visionModel"]').value = config.visionModel;
-    if (config.ttsProvider) {
-      const sel = document.querySelector('[name="ttsProvider"]');
-      sel.innerHTML = '<option value="openai">OpenAI</option><option value="elevenlabs">ElevenLabs</option><option value="google">Google Cloud</option>';
-      sel.value = config.ttsProvider;
-    }
-    if (config.ttsModel) document.querySelector('[name="ttsModel"]').value = config.ttsModel;
-    if (config.ttsVoice) document.querySelector('[name="ttsVoice"]').value = config.ttsVoice;
-    if (config.ttsSpeedFactor) document.querySelector('[name="ttsSpeedFactor"]').value = config.ttsSpeedFactor;
-    if (config.ttsInstructions) document.querySelector('[name="ttsInstructions"]').value = config.ttsInstructions;
-    if (config.batchWindowDuration) document.querySelector('[name="batchWindowDuration"]').value = config.batchWindowDuration;
-    if (config.framesInBatch) document.querySelector('[name="framesInBatch"]').value = config.framesInBatch;
-    if (config.captureIntervalSeconds) document.querySelector('[name="captureIntervalSeconds"]').value = config.captureIntervalSeconds;
-    if (config.contextWindowSize) document.querySelector('[name="contextWindowSize"]').value = config.contextWindowSize;
-    if (config.defaultPrompt) document.querySelector('[name="defaultPrompt"]').value = config.defaultPrompt;
-    if (config.changePrompt) document.querySelector('[name="changePrompt"]').value = config.changePrompt;
-    if (config.batchPrompt) document.querySelector('[name="batchPrompt"]').value = config.batchPrompt;
-  } catch (err) {
-    console.error(err);
-  }
-}
-
-// Setup SSE for live progress
-const sseConnections = {};
-function connectSSE(jobId) {
-  if (sseConnections[jobId]) return;
-  const source = new EventSource(`/api/jobs/${jobId}/progress?token=${encodeURIComponent(authToken)}`);
-  source.onmessage = (event) => {
-    const data = JSON.parse(event.data);
-    updateJobCard(jobId, data);
-    if (data.status === 'completed' || data.status === 'failed' || data.status === 'cancelled') {
-      source.close();
-      delete sseConnections[jobId];
-    }
-  };
-  source.onerror = () => {
-    source.close();
-    delete sseConnections[jobId];
-  };
-  sseConnections[jobId] = source;
-}
-
-function updateJobCard(jobId, data) {
-  const card = document.querySelector(`.job-card[data-id="${jobId}"]`);
-  if (!card) return;
-
-  const badge = card.querySelector('.status-badge');
-  badge.className = `status-badge status-${data.status}`;
-  badge.textContent = data.status;
-
-  const fill = card.querySelector('.progress-fill');
-  fill.style.width = data.progress + '%';
-  fill.className = 'progress-fill';
-  if (data.status === 'completed') fill.classList.add('completed');
-  if (data.status === 'failed') fill.classList.add('failed');
-
-  const metaSpans = card.querySelectorAll('.job-meta span');
-  if (metaSpans[0]) metaSpans[0].textContent = Math.round(data.progress) + '%';
-  if (metaSpans[1]) metaSpans[1].textContent = `Index: ${data.currentIndex}/${data.totalUnits}`;
-
-  // Update segments
-  const log = card.querySelector('.segment-log');
-  if (data.segments && log) {
-    log.innerHTML = data.segments.map((s, i) => `<div class="segment-entry"><span class="segment-time">[${s.startTime.toFixed(1)}s]</span> ${escapeHtml(s.description)}</div>`).join('');
-  }
-
-  // Update segment count button
-  const toggleBtn = card.querySelector('.toggle-detail');
-  if (toggleBtn && data.segments) {
-    toggleBtn.textContent = `${data.segments.length} segments`;
-  }
-}
-
-// Initialize
-function initApp() {
-  loadJobs();
-  loadBrowseFiles();
-  loadConfigDefaults();
-  startJobsPolling();
-}
-
-// Escape HTML for safe rendering
-function escapeHtml(str) {
-  if (!str) return '';
-  return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
-}
-
-function formatSize(bytes) {
-  if (!bytes) return '0 B';
-  const units = ['B', 'KB', 'MB', 'GB'];
-  let i = 0;
-  let size = bytes;
-  while (size >= 1024 && i < units.length - 1) { size /= 1024; i++; }
-  return `${size.toFixed(1)} ${units[i]}`;
-}
-
-// Check if already authenticated
-(async () => {
-  if (authToken) {
-    try {
-      const res = await fetch('/api/auth/check', { headers: { Authorization: `Basic ${authToken}` } });
-      const data = await res.json();
-      if (data.authenticated) {
-        showMain();
-        initApp();
+el('delete-selected-files').addEventListener('click', () => {
+    if (!confirm(`Delete ${selectedFiles.size} file(s)?`))
         return;
-      }
-    } catch (e) {}
-  }
-  showLogin();
+    alert('File deletion not yet implemented');
+});
+el('refresh-files-list').addEventListener('click', loadFilesList);
+// ── Config defaults for New Job form ─────────────────
+async function loadConfigDefaults() {
+    try {
+        const data = await apiJson('GET', '/api/config');
+        const c = data.config || {};
+        if (c.visionProvider) {
+            const sel = document.querySelector('[name="visionProvider"]');
+            if (sel) {
+                sel.innerHTML = '<option value="openai">OpenAI</option><option value="gemini">Gemini</option><option value="ollama">Ollama</option><option value="openrouter">OpenRouter</option>';
+                sel.value = c.visionProvider;
+            }
+        }
+        if (c.ttsProvider) {
+            const sel = document.querySelector('[name="ttsProvider"]');
+            if (sel) {
+                sel.innerHTML = '<option value="openai">OpenAI</option><option value="elevenlabs">ElevenLabs</option><option value="google">Google Cloud</option>';
+                sel.value = c.ttsProvider;
+            }
+        }
+        const fields = [
+            ['visionModel'], ['ttsModel'], ['ttsVoice'], ['ttsSpeedFactor'],
+            ['ttsInstructions', 'textarea'], ['batchWindowDuration'], ['framesInBatch'],
+            ['captureIntervalSeconds'], ['contextWindowSize'],
+            ['defaultPrompt', 'textarea'], ['changePrompt', 'textarea'], ['batchPrompt', 'textarea'],
+        ];
+        for (const [name, tag] of fields) {
+            const el = document.querySelector(`[name="${name}"]`);
+            if (el && c[name] !== undefined)
+                el.value = c[name];
+        }
+    }
+    catch (err) {
+        console.error(err);
+    }
+}
+// ── Init ──────────────────────────────────────────────
+function initApp() {
+    loadJobs();
+    loadBrowseFiles();
+    loadConfigDefaults();
+    startPolling();
+}
+// ── Startup ───────────────────────────────────────────
+(async () => {
+    if (authToken) {
+        try {
+            const res = await fetch('/api/auth/check', {
+                headers: { Authorization: `Basic ${authToken}` },
+            });
+            const data = await res.json();
+            if (data.authenticated) {
+                showMainScreen();
+                initApp();
+                return;
+            }
+        }
+        catch { /* fall through to login */ }
+    }
+    showLoginScreen();
 })();
diff --git a/src/server/public/app.ts b/src/server/public/app.ts
new file mode 100644
index 0000000..a8e69dd
--- /dev/null
+++ b/src/server/public/app.ts
@@ -0,0 +1,642 @@
+// ── Types ────────────────────────────────────────────
+
+interface Job {
+  id: string;
+  video_path: string;
+  video_filename: string;
+  status: 'pending' | 'queued' | 'processing' | 'paused' | 'completed' | 'failed' | 'cancelled';
+  config: string;
+  progress: number;
+  current_index: number;
+  total_units: number;
+  segments: string;
+  last_context: string;
+  current_time_position: number;
+  error: string | null;
+  created_at: string;
+  updated_at: string;
+  completed_at: string | null;
+  output_audio: string | null;
+  output_subtitles_srt: string | null;
+  output_subtitles_vtt: string | null;
+  output_muxed: string | null;
+  output_options: string;
+}
+
+interface AudioSegment {
+  audioFile: string;
+  startTime: number;
+  duration: number;
+  description: string;
+}
+
+interface ProgressData {
+  id: string;
+  status: string;
+  progress: number;
+  currentIndex: number;
+  totalUnits: number;
+  segments: AudioSegment[];
+  error: string | null;
+  output_audio: string | null;
+  output_subtitles_srt: string | null;
+  output_subtitles_vtt: string | null;
+  output_muxed: string | null;
+}
+
+interface FileInfo {
+  filename: string;
+  filePath: string;
+  size: number;
+}
+
+// ── State ────────────────────────────────────────────
+
+let authToken: string | null = sessionStorage.getItem('authToken');
+let selectedFilePath: string | null = null;
+const sseMap = new Map<string, EventSource>();
+let pollTimer: number | null = null;
+
+// ── DOM helpers ───────────────────────────────────────
+
+const $ = (sel: string): HTMLElement => document.querySelector(sel) as HTMLElement;
+const $$ = (sel: string): NodeListOf<HTMLElement> => document.querySelectorAll(sel);
+const el = (id: string): HTMLElement => document.getElementById(id)!;
+
+// ── API ───────────────────────────────────────────────
+
+function apiHeaders(): Record<string, string> {
+  const h: Record<string, string> = { 'Content-Type': 'application/json' };
+  if (authToken) h['Authorization'] = `Basic ${authToken}`;
+  return h;
+}
+
+async function api(method: string, url: string, body?: unknown): Promise<Response> {
+  const res = await fetch(url, {
+    method,
+    headers: apiHeaders(),
+    body: body ? JSON.stringify(body) : undefined,
+  });
+  if (res.status === 401) {
+    sessionStorage.removeItem('authToken');
+    authToken = null;
+    showLoginScreen();
+    throw new Error('Unauthorized');
+  }
+  return res;
+}
+
+async function apiJson<T>(method: string, url: string, body?: unknown): Promise<T> {
+  const res = await api(method, url, body);
+  const data = await res.json();
+  if (!res.ok) throw new Error(data.error || 'Request failed');
+  return data as T;
+}
+
+// ── Screen switching ──────────────────────────────────
+
+function showLoginScreen(): void {
+  el('login-screen').classList.remove('hidden');
+  el('main-screen').classList.add('hidden');
+}
+
+function showMainScreen(): void {
+  el('login-screen').classList.add('hidden');
+  el('main-screen').classList.remove('hidden');
+}
+
+// ── Tab navigation ────────────────────────────────────
+
+function switchTab(name: string): void {
+  $$('button.tab').forEach(b => b.classList.remove('active'));
+  document.querySelector<HTMLElement>(`button.tab[data-tab="${name}"]`)?.classList.add('active');
+
+  $$('.tab-content').forEach(c => c.classList.remove('active'));
+  const pane = document.getElementById(name);
+  if (pane) pane.classList.add('active');
+
+  if (name === 'dashboard') loadJobs();
+  if (name === 'files') loadFilesList();
+}
+
+$$('button.tab').forEach(btn => {
+  btn.addEventListener('click', () => switchTab(btn.dataset.tab || ''));
+});
+
+// ── Mini tabs (video source) ──────────────────────────
+
+$$('button.tab-mini').forEach(btn => {
+  btn.addEventListener('click', () => {
+    $$('button.tab-mini').forEach(b => b.classList.remove('active'));
+    btn.classList.add('active');
+    $$('.src-panel').forEach(p => p.classList.remove('active'));
+    const panel = document.getElementById('src-' + (btn.dataset.src || ''));
+    if (panel) panel.classList.add('active');
+  });
+});
+
+// ── Login ─────────────────────────────────────────────
+
+el('login-form').addEventListener('submit', async (e) => {
+  e.preventDefault();
+  const username = (el('login-username') as HTMLInputElement).value;
+  const password = (el('login-password') as HTMLInputElement).value;
+  try {
+    const res = await fetch('/api/auth/login', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ username, password }),
+    });
+    const data = await res.json();
+    if (data.authenticated) {
+      authToken = data.token;
+      if (authToken) sessionStorage.setItem('authToken', authToken);
+      showMainScreen();
+      initApp();
+    } else {
+      el('login-error').textContent = data.error;
+      el('login-error').classList.remove('hidden');
+    }
+  } catch {
+    el('login-error').textContent = 'Connection failed';
+    el('login-error').classList.remove('hidden');
+  }
+});
+
+el('logout-btn').addEventListener('click', () => {
+  sessionStorage.removeItem('authToken');
+  authToken = null;
+  sseMap.forEach(s => s.close());
+  sseMap.clear();
+  if (pollTimer) clearInterval(pollTimer);
+  showLoginScreen();
+});
+
+// ── Utils ─────────────────────────────────────────────
+
+function escapeHtml(str: string | null | undefined): string {
+  if (!str) return '';
+  return String(str)
+    .replace(/&/g, '&amp;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;');
+}
+
+function formatSize(bytes: number): string {
+  if (!bytes) return '0 B';
+  const units = ['B', 'KB', 'MB', 'GB'];
+  let i = 0;
+  let size = bytes;
+  while (size >= 1024 && i < units.length - 1) { size /= 1024; i++; }
+  return `${size.toFixed(1)} ${units[i]}`;
+}
+
+// ── Browse files (for New Job) ────────────────────────
+
+async function loadBrowseFiles(): Promise<void> {
+  try {
+    const data = await apiJson<{ files: FileInfo[] }>('GET', '/api/files');
+    const sel = el('video-select') as HTMLSelectElement;
+    sel.innerHTML = '<option value="">-- Select file --</option>';
+    data.files.forEach(f => {
+      const opt = document.createElement('option');
+      opt.value = f.filePath;
+      opt.textContent = `${f.filename} (${formatSize(f.size)})`;
+      sel.appendChild(opt);
+    });
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+el('refresh-files').addEventListener('click', loadBrowseFiles);
+
+(el('video-select') as HTMLSelectElement).addEventListener('change', function () {
+  if (this.value) selectedFilePath = this.value;
+});
+
+// ── File upload ───────────────────────────────────────
+
+(el('video-upload') as HTMLInputElement).addEventListener('change', function () {
+  if (this.files?.length) selectedFilePath = null; // will upload on submit
+});
+
+// ── YouTube download ──────────────────────────────────
+
+el('download-url').addEventListener('click', async () => {
+  const url = (el('youtube-url') as HTMLInputElement).value;
+  if (!url) return;
+  const status = el('download-status');
+  status.textContent = 'Downloading...';
+  status.className = 'status';
+  try {
+    const data = await apiJson<{ filePath: string; filename: string }>('POST', '/api/files/youtube', { url });
+    status.textContent = `Downloaded: ${data.filename}`;
+    status.className = 'status success';
+    selectedFilePath = data.filePath;
+    const sel = el('video-select') as HTMLSelectElement;
+    const opt = document.createElement('option');
+    opt.value = data.filePath;
+    opt.textContent = data.filename;
+    opt.selected = true;
+    sel.appendChild(opt);
+  } catch (err: any) {
+    status.textContent = `Error: ${err.message}`;
+    status.className = 'status error';
+  }
+});
+
+// ── New Job form ──────────────────────────────────────
+
+el('new-job-form').addEventListener('submit', async (e) => {
+  e.preventDefault();
+  if (!selectedFilePath) {
+    const fileEl = el('video-upload') as HTMLInputElement;
+    if (fileEl.files?.length) {
+      const formData = new FormData();
+      formData.append('video', fileEl.files[0]);
+      try {
+        const headers: Record<string, string> = {};
+        if (authToken) headers['Authorization'] = `Basic ${authToken}`;
+        const res = await fetch('/api/files/upload', { method: 'POST', headers, body: formData });
+        const data = await res.json();
+        if (!res.ok) throw new Error(data.error || 'Upload failed');
+        selectedFilePath = data.filePath;
+      } catch (err: any) {
+        alert('Upload error: ' + err.message);
+        return;
+      }
+    } else {
+      alert('Please select a video file or source');
+      return;
+    }
+  }
+
+  const fd = new FormData(e.target as HTMLFormElement);
+  const config: Record<string, unknown> = {};
+  for (const [key, val] of fd.entries()) {
+    if (key === '') continue;
+    if (val === 'on') config[key] = true;
+    else if (val === 'off') config[key] = false;
+    else if (!isNaN(val as any) && val !== '') config[key] = parseFloat(val as string);
+    else config[key] = val;
+  }
+
+  const outputOptions = {
+    audio: fd.get('output-audio') === 'on',
+    subtitles: fd.get('output-subtitles') === 'on',
+    muxed: fd.get('output-muxed') === 'on',
+  };
+
+  if (config.visionProvider) {
+    const vp: Record<string, unknown> = {};
+    vp[config.visionProvider as string] = {
+      model: config.visionModel || 'gpt-4o',
+      maxTokens: config.visionMaxTokens ? parseInt(config.visionMaxTokens as string) : 300,
+    };
+    config.visionProviders = vp;
+  }
+  if (config.ttsProvider) {
+    const tp: Record<string, unknown> = {};
+    tp[config.ttsProvider as string] = {
+      model: config.ttsModel || 'tts-1',
+      voice: config.ttsVoice || 'alloy',
+    };
+    config.ttsProviders = tp;
+  }
+
+  delete config.visionModel;
+  delete config.visionMaxTokens;
+  delete config.ttsModel;
+  delete config['output-audio'];
+  delete config['output-subtitles'];
+  delete config['output-muxed'];
+
+  try {
+    const data = await apiJson<{ job: Job }>('POST', '/api/jobs', {
+      videoPath: selectedFilePath,
+      config,
+      outputOptions,
+    });
+    await apiJson('POST', `/api/jobs/${data.job.id}/start`);
+    selectedFilePath = null;
+    (el('video-upload') as HTMLInputElement).value = '';
+    (el('new-job-form') as HTMLFormElement).reset();
+    switchTab('dashboard');
+  } catch (err: any) {
+    alert('Error creating job: ' + err.message);
+  }
+});
+
+// ── Job list & rendering ──────────────────────────────
+
+async function loadJobs(): Promise<void> {
+  try {
+    const data = await apiJson<{ jobs: Job[] }>('GET', '/api/jobs');
+    renderJobs(data.jobs);
+    data.jobs.forEach(j => {
+      if (j.status === 'processing' || j.status === 'queued') {
+        connectSSE(j.id);
+      }
+    });
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+function renderJobs(jobs: Job[]): void {
+  const container = el('jobs-list');
+  if (!jobs.length) {
+    container.innerHTML = '<p class="empty">No jobs yet. Create one from the "New Job" tab.</p>';
+    return;
+  }
+
+  container.innerHTML = jobs.map(j => {
+    const segs: AudioSegment[] = JSON.parse(j.segments || '[]');
+    const progressClass = j.status === 'completed' ? 'completed' : j.status === 'failed' ? 'failed' : '';
+    const downloads: string[] = [];
+
+    if (j.status === 'completed') {
+      if (j.output_audio) downloads.push(`<a href="/api/jobs/${j.id}/download/audio" download>Audio</a>`);
+      if (j.output_subtitles_srt) downloads.push(`<a href="/api/jobs/${j.id}/download/subtitles?format=srt" download>SRT</a>`);
+      if (j.output_subtitles_vtt) downloads.push(`<a href="/api/jobs/${j.id}/download/subtitles?format=vtt" download>VTT</a>`);
+      if (j.output_muxed) downloads.push(`<a href="/api/jobs/${j.id}/download/muxed" download>Muxed</a>`);
+    }
+
+    let actions = '';
+    if (j.status === 'pending' || j.status === 'queued') {
+      actions += `<button class="act-start" data-id="${j.id}">Start</button>`;
+    }
+    if (j.status === 'processing') {
+      actions += `<button class="act-pause" data-id="${j.id}">Pause</button>`;
+    }
+    if (j.status === 'failed' || j.status === 'paused' || j.status === 'cancelled') {
+      actions += `<button class="act-restart" data-id="${j.id}">Restart</button>`;
+    }
+    if (j.status !== 'processing') {
+      actions += `<button class="act-delete danger" data-id="${j.id}">Delete</button>`;
+    }
+
+    return `
+      <div class="job-card" data-id="${j.id}">
+        <div class="job-card-header">
+          <h3>${escapeHtml(j.video_filename)}</h3>
+          <div class="job-actions">${actions}</div>
+        </div>
+        <span class="status-badge status-${j.status}">${j.status}</span>
+        <div class="progress-bar"><div class="progress-fill ${progressClass}" style="width:${j.progress}%"></div></div>
+        <div class="job-meta">
+          <span>${Math.round(j.progress)}%</span>
+          <span>Idx: ${j.current_index}/${j.total_units}</span>
+          <span>${new Date(j.created_at).toLocaleString()}</span>
+        </div>
+        ${j.error ? `<div class="error-msg">${escapeHtml(j.error)}</div>` : ''}
+        ${downloads.length ? `<div class="download-links">${downloads.join('')}</div>` : ''}
+        <div class="job-detail" data-id="${j.id}">
+          <div class="segment-log">${segs.map((s, i) => `<div class="segment-entry"><span class="segment-time">[${s.startTime.toFixed(1)}s]</span> ${escapeHtml(s.description)}</div>`).join('')}</div>
+        </div>
+        <button class="toggle-detail" data-id="${j.id}">${segs.length} segments</button>
+      </div>`;
+  }).join('');
+
+  // Wire up action buttons
+  container.querySelectorAll<HTMLElement>('.act-start').forEach(b =>
+    b.addEventListener('click', () => handleJobAction(b.dataset.id || '', 'start')));
+  container.querySelectorAll<HTMLElement>('.act-pause').forEach(b =>
+    b.addEventListener('click', () => handleJobAction(b.dataset.id || '', 'pause')));
+  container.querySelectorAll<HTMLElement>('.act-restart').forEach(b =>
+    b.addEventListener('click', () => handleJobAction(b.dataset.id || '', 'restart')));
+  container.querySelectorAll<HTMLElement>('.act-delete').forEach(b =>
+    b.addEventListener('click', () => handleJobAction(b.dataset.id || '', 'delete')));
+  container.querySelectorAll<HTMLElement>('.toggle-detail').forEach(b => {
+    b.addEventListener('click', () => {
+      const jobId = b.dataset.id || '';
+      const detail = container.querySelector<HTMLElement>(`.job-detail[data-id="${jobId}"]`);
+      if (!detail) return;
+      detail.classList.toggle('open');
+      const job = jobs.find(j => j.id === jobId);
+      const segs: AudioSegment[] = job ? JSON.parse(job.segments || '[]') : [];
+      b.textContent = detail.classList.contains('open') ? 'Hide segments' : `${segs.length} segments`;
+    });
+  });
+}
+
+async function handleJobAction(id: string, action: string): Promise<void> {
+  const method = action === 'delete' ? 'DELETE' : 'POST';
+  const url = `/api/jobs/${id}${action === 'delete' ? '' : '/' + action}`;
+  try {
+    await api(method, url);
+    loadJobs();
+  } catch (err: any) {
+    alert(`Error: ${err.message}`);
+  }
+}
+
+el('refresh-jobs').addEventListener('click', loadJobs);
+
+// ── Polling ───────────────────────────────────────────
+
+function startPolling(): void {
+  if (pollTimer) return;
+  pollTimer = window.setInterval(loadJobs, 5000);
+}
+
+// ── SSE live progress ─────────────────────────────────
+
+function connectSSE(jobId: string): void {
+  if (sseMap.has(jobId)) return;
+  const es = new EventSource(`/api/jobs/${jobId}/progress?token=${encodeURIComponent(authToken!)}`);
+  es.onmessage = (event: MessageEvent) => {
+    const data: ProgressData = JSON.parse(event.data);
+    updateJobCard(jobId, data);
+    if (data.status === 'completed' || data.status === 'failed' || data.status === 'cancelled') {
+      es.close();
+      sseMap.delete(jobId);
+    }
+  };
+  es.onerror = () => {
+    es.close();
+    sseMap.delete(jobId);
+  };
+  sseMap.set(jobId, es);
+}
+
+function updateJobCard(jobId: string, data: ProgressData): void {
+  const card = document.querySelector<HTMLElement>(`.job-card[data-id="${jobId}"]`);
+  if (!card) return;
+
+  const badge = card.querySelector('.status-badge');
+  if (badge) {
+    badge.className = `status-badge status-${data.status}`;
+    badge.textContent = data.status;
+  }
+
+  const fill = card.querySelector<HTMLElement>('.progress-fill');
+  if (fill) {
+    fill.style.width = data.progress + '%';
+    fill.className = 'progress-fill';
+    if (data.status === 'completed') fill.classList.add('completed');
+    else if (data.status === 'failed') fill.classList.add('failed');
+  }
+
+  const metaSpans = card.querySelectorAll<HTMLElement>('.job-meta span');
+  if (metaSpans[0]) metaSpans[0].textContent = Math.round(data.progress) + '%';
+  if (metaSpans[1]) metaSpans[1].textContent = `Idx: ${data.currentIndex}/${data.totalUnits}`;
+
+  const log = card.querySelector<HTMLElement>('.segment-log');
+  if (log && data.segments) {
+    log.innerHTML = data.segments.map(s =>
+      `<div class="segment-entry"><span class="segment-time">[${s.startTime.toFixed(1)}s]</span> ${escapeHtml(s.description)}</div>`
+    ).join('');
+  }
+
+  const toggleBtn = card.querySelector<HTMLElement>('.toggle-detail');
+  if (toggleBtn && data.segments) {
+    toggleBtn.textContent = `${data.segments.length} segments`;
+  }
+}
+
+// ── Settings ──────────────────────────────────────────
+
+async function loadSettings(): Promise<void> {
+  try {
+    const data = await apiJson<{ config: Record<string, string> }>('GET', '/api/config');
+    const container = el('settings-fields');
+    const entries = Object.entries(data.config || {});
+    if (!entries.length) {
+      container.innerHTML = '<p class="empty">No custom settings yet. Settings from .env are used as defaults.</p>';
+      return;
+    }
+    container.innerHTML = entries.map(([key, value]) =>
+      `<label>${escapeHtml(key)} <input type="text" name="${escapeHtml(key)}" value="${escapeHtml(String(value))}"></label>`
+    ).join('');
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+el('settings-form').addEventListener('submit', async (e) => {
+  e.preventDefault();
+  const fd = new FormData(e.target as HTMLFormElement);
+  const config: Record<string, string> = {};
+  for (const [key, val] of fd.entries()) {
+    config[key] = val as string;
+  }
+  try {
+    await apiJson('PUT', '/api/config', config);
+    alert('Settings saved');
+  } catch (err: any) {
+    alert('Error: ' + err.message);
+  }
+});
+
+// ── Files list ────────────────────────────────────────
+
+let selectedFiles = new Set<string>();
+
+async function loadFilesList(): Promise<void> {
+  try {
+    const data = await apiJson<{ files: FileInfo[] }>('GET', '/api/files');
+    const tbody = document.querySelector('#files-table tbody')!;
+    tbody.innerHTML = data.files.map(f => `
+      <tr>
+        <td><input type="checkbox" class="file-checkbox" data-path="${escapeHtml(f.filePath)}"></td>
+        <td>${escapeHtml(f.filename)}</td>
+        <td>${formatSize(f.size)}</td>
+      </tr>
+    `).join('');
+
+    tbody.querySelectorAll<HTMLInputElement>('.file-checkbox').forEach(cb => {
+      cb.addEventListener('change', updateFileSelection);
+    });
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+function updateFileSelection(): void {
+  selectedFiles.clear();
+  document.querySelectorAll<HTMLInputElement>('.file-checkbox:checked').forEach(cb => {
+    if (cb.dataset.path) selectedFiles.add(cb.dataset.path);
+  });
+  (el('delete-selected-files') as HTMLButtonElement).disabled = selectedFiles.size === 0;
+}
+
+(el('select-all-files') as HTMLInputElement).addEventListener('change', function () {
+  document.querySelectorAll<HTMLInputElement>('.file-checkbox').forEach(cb => {
+    cb.checked = this.checked;
+  });
+  updateFileSelection();
+});
+
+el('delete-selected-files').addEventListener('click', () => {
+  if (!confirm(`Delete ${selectedFiles.size} file(s)?`)) return;
+  alert('File deletion not yet implemented');
+});
+
+el('refresh-files-list').addEventListener('click', loadFilesList);
+
+// ── Config defaults for New Job form ─────────────────
+
+async function loadConfigDefaults(): Promise<void> {
+  try {
+    const data = await apiJson<{ config: Record<string, string> }>('GET', '/api/config');
+    const c = data.config || {};
+
+    if (c.visionProvider) {
+      const sel = document.querySelector<HTMLSelectElement>('[name="visionProvider"]');
+      if (sel) {
+        sel.innerHTML = '<option value="openai">OpenAI</option><option value="gemini">Gemini</option><option value="ollama">Ollama</option><option value="openrouter">OpenRouter</option>';
+        sel.value = c.visionProvider;
+      }
+    }
+    if (c.ttsProvider) {
+      const sel = document.querySelector<HTMLSelectElement>('[name="ttsProvider"]');
+      if (sel) {
+        sel.innerHTML = '<option value="openai">OpenAI</option><option value="elevenlabs">ElevenLabs</option><option value="google">Google Cloud</option>';
+        sel.value = c.ttsProvider;
+      }
+    }
+    const fields: [string, string?][] = [
+      ['visionModel'], ['ttsModel'], ['ttsVoice'], ['ttsSpeedFactor'],
+      ['ttsInstructions', 'textarea'], ['batchWindowDuration'], ['framesInBatch'],
+      ['captureIntervalSeconds'], ['contextWindowSize'],
+      ['defaultPrompt', 'textarea'], ['changePrompt', 'textarea'], ['batchPrompt', 'textarea'],
+    ];
+    for (const [name, tag] of fields) {
+      const el = document.querySelector<HTMLInputElement | HTMLTextAreaElement>(`[name="${name}"]`);
+      if (el && c[name] !== undefined) el.value = c[name];
+    }
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+// ── Init ──────────────────────────────────────────────
+
+function initApp(): void {
+  loadJobs();
+  loadBrowseFiles();
+  loadConfigDefaults();
+  startPolling();
+}
+
+// ── Startup ───────────────────────────────────────────
+
+(async () => {
+  if (authToken) {
+    try {
+      const res = await fetch('/api/auth/check', {
+        headers: { Authorization: `Basic ${authToken}` },
+      });
+      const data = await res.json();
+      if (data.authenticated) {
+        showMainScreen();
+        initApp();
+        return;
+      }
+    } catch { /* fall through to login */ }
+  }
+  showLoginScreen();
+})();
diff --git a/src/server/public/index.html b/src/server/public/index.html
index f1a9421..8446d1b 100644
--- a/src/server/public/index.html
+++ b/src/server/public/index.html
@@ -43,7 +43,7 @@
       </div>
     </div>
 
-    <div id="new-job" class="tab-content hidden">
+    <div id="new-job" class="tab-content">
       <h2>Create New Job</h2>
       <form id="new-job-form">
         <fieldset>
@@ -118,7 +118,7 @@
       </form>
     </div>
 
-    <div id="settings" class="tab-content hidden">
+    <div id="settings" class="tab-content">
       <h2>Server Configuration</h2>
       <p class="hint">These settings are stored on the server and used as defaults for new jobs.</p>
       <form id="settings-form">
@@ -127,7 +127,7 @@
       </form>
     </div>
 
-    <div id="files" class="tab-content hidden">
+    <div id="files" class="tab-content">
       <h2>Uploaded Files</h2>
       <div class="toolbar">
         <button id="refresh-files-list">Refresh</button>
@@ -140,6 +140,6 @@
   </div>
 </div>
 
-<script src="/app.js"></script>
+<script type="module" src="/app.js"></script>
 </body>
 </html>
diff --git a/src/server/public/tsconfig.json b/src/server/public/tsconfig.json
new file mode 100644
index 0000000..6306c37
--- /dev/null
+++ b/src/server/public/tsconfig.json
@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "ES2020",
+    "moduleResolution": "node",
+    "strict": true,
+    "esModuleInterop": true,
+    "outDir": ".",
+    "rootDir": ".",
+    "sourceMap": false,
+    "declaration": false,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"]
+  },
+  "files": ["app.ts"]
+}