About box shows only the newest 5 releases (screen-reader crash fix)

The About box's release notes had accumulated the ENTIRE version history back to v1.0 —
~70 KB in a single TextBox — and reading a control value that size crashes some screen
readers (user reports, 2026-08-11). The box now displays only the newest five version
blocks via a pure trim (TrimToLastVersions), ending with a plain pointer to the full
history on the GitHub releases page. The full constant stays in source as the archive.

Gate: new step pins the trim logic on synthetic notes AND the real shipped text (exactly
5 versions, size well under the crashing range — 5,516 chars vs ~70,000) so the crash
can't quietly return as releases accumulate. 73/73. Readme About section updated + MANUAL
regenerated; 5.8 notes mention the change.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

readme.html

@@ -1236,7 +1236,7 @@ Use whatever key combinations you prefer (for example Ctrl+Shift+Up / Ctrl+Shift
 
 <h3>The About dialog and release notes</h3>
 
-<p>To see which version you're on without checking for updates, open <strong>Help &rarr; About RemSound</strong> (Alt+H, A). The dialog shows the version number and the release notes for the version you're running, in a scrollable read-only box. Close (or Esc) dismisses it.</p>
+<p>To see which version you're on without checking for updates, open <strong>Help &rarr; About RemSound</strong> (Alt+H, A). The dialog shows the version number and the release notes for the newest five versions, in a scrollable read-only box &mdash; newest first, so what just changed is right at the top. Notes for every older version live on the RemSound releases page on GitHub. Close (or Esc) dismisses it.</p>
 
 <h2 id="recording">21. Recording to a file</h2>