Release v3.5: USB-card recovery, per-card adaptive buffer, one user folder, audit fixes

- Recover an unplugged/replugged output sound card automatically (issue #5):
  detect the dead WASAPI device and remember the receive-output selection so it
  re-ticks and re-opens when the card returns.
- Adaptive per-card WASAPI buffer target sized to each card's pull chunk, held
  stable so it never flits about under CPU/network load.
- Consolidate all per-user data (config, profiles, logs, sounds) into one
  "user settings and logs" folder; migrate every older layout; exclude it from
  the updater so custom cue sounds now survive updates.
- Mic-privacy detector: warn once when a Windows-blocked mic is switched on, or a
  profile loads with one already on.
- All warning/notice dialogs now come to the foreground even when minimised.
- Apply volume + mute on profile load (were saved but not restored).
- Crash-safe (atomic) profile/config saves.
- Fix two resource leaks (push-mode capture MMDevice; UPnP DeviceFound handler).
- Remove dead code (baseline-diff machinery, dead ASIO probes, no-op stubs).
- Docs: readme.html, MANUAL.md, About-box changelog and release notes for v3.5.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/RemSound.App/ProfilePasswordDialog.cs

@@ -13,7 +13,7 @@ namespace RemSound.App;
 /// </summary>
 internal static class ProfilePasswordDialog
 {
-    public static string? Show(IWin32Window owner, string profileTitle, string currentPassword, bool requireNonEmpty = false)
+    public static string? Show(string profileTitle, string currentPassword, bool requireNonEmpty = false)
     {
         using var dialog = new Form
         {
@@ -99,6 +99,12 @@ internal static class ProfilePasswordDialog
         dialog.AcceptButton = okButton;
         dialog.CancelButton = cancelButton;
 
-        return dialog.ShowDialog(owner) == DialogResult.OK ? textBox.Text.Trim() : null;
+        // Run with a foreground 1×1 owner so the prompt jumps to the front even when RemSound is
+        // sitting minimised in the tray — e.g. a quick profile switch to a passwordless-but-
+        // streaming profile trips the password gate mid-switch, and the user must be able to read
+        // and answer it there and then. Centres on screen, forces focus, then closes.
+        return ForegroundDialog.Show(owner => dialog.ShowDialog(owner)) == DialogResult.OK
+            ? textBox.Text.Trim()
+            : null;
     }
 }