Release v4.7: keep trying your configured peer after a reboot (#15)

Removes the heartbeat "adopt a live address" feature (added v1.6). On a LAN with
more than one RemSound machine it could latch a receiver onto an unrelated sender
that happened to be pinging the audio port — then never recover to the real peer,
needing a manual restart (the singer's #15, with log). The feature guessed peer
identity from an untracked ping source with no way to verify it was the same peer;
on the stable VPN/LAN addresses RemSound is actually used with, it only ever caused
harm, since same-address reconnect already works via the continuous heartbeat.
Removed TryAdoptLiveHeartbeatAddress + IsPrivateLanAddress (MainForm) and
GetUntrackedPingSources + recentPingSources (HeartbeatService); the identity-safe
discovery-based following (by verified peer ID) stays. Manual troubleshooting entry
rewritten to match.

Also bundles the held changes since v4.6: status reads line-by-line with GB totals
and double-press-to-copy, CPU/memory in the status, the Install Scripts folder, and
the what's-new-after-failed-update fix. Version 4.7; About + RELEASE_NOTES updated.

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

src/RemSound.App/RemSound.App.csproj

@@ -14,7 +14,7 @@
          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>4.6</Version>
+    <Version>4.7</Version>
   </PropertyGroup>
 
   <ItemGroup>