Release prep v5.3: version bump, About changelog, release notes

- csproj <Version> 5.2 -> 5.3.
- About box: prepend the v5.3 entry (single-app sending, lock-screen service,
  freer ASIO driver switching).
- RELEASE_NOTES.md rewritten for v5.3.

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

RELEASE_NOTES.md

@@ -1,36 +1,47 @@
-# RemSound v5.2
+# RemSound v5.3
 
-A stability and polish release. No new features — this one is bug fixes and internal tidy-ups from a deep code review, so it should just feel a bit more solid.
+Send a single application's sound, and stream a machine from its lock screen. Plus freer use of pro (ASIO) sound cards.
 
-## Fixes you might notice
+## Send one application, not the whole device
 
-- **Changing the codec or send rate while streaming** could, in rare cases, crash RemSound with no warning. Fixed.
-- **Recording "both sent and received" into a single file** could lose small amounts of audio and drift out of sync over a long session. It now stays sample-accurate for the whole recording.
-- **After installing**, RemSound now honours your "start minimised" setting on the first relaunch (and still comes to the front when you're not starting minimised).
-- **Uninstalling** one copy no longer switches off a different copy's "run at startup".
-- Starting a split "received only" recording with **no peers connected** now tells you clearly, instead of quietly making an empty folder.
-- The **clipping indicator** in the diagnostics works again.
+Until now you sent a whole audio device — everything coming out of your PC. In the send list you can now choose a **specific application** instead: just your music player, just your game, just a call. Only that program's sound goes out; the rest of your PC stays private.
 
-## Under the hood
+- Tick any app that's **currently making sound**, or **name an app** so RemSound catches it the moment it opens.
+- Whole-device sending works exactly as before — this is an extra choice, not a replacement.
 
-- The automatic-update restart now brings the window to the front, the same way the installer does.
-- The router port opened by UPnP is properly removed when you close RemSound.
-- Lighter on memory and disk — fewer background file reads while you work, and tidier release of resources when the window closes or switches profiles.
+## Stream from the lock screen, before anyone signs in
+
+There's a new, **optional RemSound service**. It can send a machine's audio from the Windows **lock screen** — so you can hear a computer that's powered on but not yet logged in, which the normal app can't do because nothing runs until you sign in.
+
+- Install it **once**, from the RemSound installer (it offers to set it up for you). It needs administrator rights that one time only.
+- It runs quietly in the background and **steps aside automatically** the instant you open RemSound normally, handing the audio back to the app.
+- It **updates itself** whenever RemSound updates — there's nothing to maintain.
+
+If you never want it, don't install it: nothing about the normal app changes.
+
+## Freer with professional (ASIO) sound cards
+
+- You can now **switch between ASIO drivers** while RemSound is open.
+- RemSound **releases the sound card** when it isn't using it, so another program (a DAW, for example) can take it over instead of being locked out.
+
+## Also
+
+- Per-application sending is fully wired through the app, and a range of fixes and internal tidy-ups from continued review.
 
 ## Compatibility
 
-Nothing about the over-the-network format changed, so **v5.2 talks to v3.3 through v5.1** with no trouble — you don't have to update both ends at once. (Everyone still needs **v3.3 or newer**, where end-to-end encryption came in.)
+Nothing about the over-the-network format changed, so **v5.3 talks to v3.3 through v5.2** with no trouble — you don't have to update both ends at once. (Everyone still needs **v3.3 or newer**, where end-to-end encryption came in.)
 
 ## Install
 
-1. Download `RemSound-v5.2.zip` from this release.
+1. Download `RemSound-v5.3.zip` from this release.
 2. Close RemSound.
 3. Extract the zip **over your existing RemSound folder**, overwriting program files when prompted. The zip is program files only — it won't touch your settings, profiles, logs or recordings.
 4. Run `RemSound.exe`.
 
 ## Upgrading
 
-**From v3.6 or newer:** Help → Check for updates installs v5.2 with the in-app updater — and if it can't finish, it puts your old version back exactly as it was.
+**From v3.6 or newer:** Help → Check for updates installs v5.3 with the in-app updater — and if it can't finish, it puts your old version back exactly as it was.
 
 **From v1.9–v3.5:** Check for updates works, but uses your current version's older updater for this one hop. If auto-update has been failing on your machine, install by hand using the steps above.
 

src/RemSound.App/AboutDialog.cs

@@ -20,6 +20,16 @@ internal sealed class AboutDialog : Form
     /// updates" path.</summary>
     private const string ReleaseNotes =
         """
+        RemSound v5.3
+
+        Send a single app, and stream from the lock screen.
+
+        Send one application, not the whole device. In the send list you can now pick a specific program — just your music player, or just your game — and send only its sound, keeping the rest of your PC private. Tick apps that are already running, or name ones to be caught the instant they open.
+
+        Stream before you even sign in. A new, optional RemSound service can send a machine's audio from the Windows lock screen, so you can hear a computer that's switched on but not yet logged in. You install it once from the RemSound installer; it runs quietly in the background, steps aside the moment you open RemSound normally, and updates itself whenever RemSound does.
+
+        Freer with pro (ASIO) sound cards. You can now switch between ASIO drivers while RemSound is open, and RemSound lets go of the sound card when it isn't using it, so another app — a DAW, say — can take over. Plus fixes and polish under the hood.
+
         RemSound v5.2
 
         A stability and polish release — bug fixes and tidy-ups from a deep code review. No new features; it should just feel a bit more solid.

src/RemSound.App/RemSound.App.csproj

@@ -18,7 +18,7 @@
          tag_name on the latest GitHub release; bump it on every public release. The
          AssemblyVersion / FileVersion default to this value, and Assembly.GetName().Version
          is what the About dialog and the updater both read. -->
-    <Version>5.2</Version>
+    <Version>5.3</Version>
   </PropertyGroup>
 
   <ItemGroup>