chore: code quality sweep 2026-05-04 / 2026-05-05

General code-quality and robustness pass across the plugin: thread-
safety on IPC state, resource-disposal cleanups, input validation,
defensive null-checks and a few small UX glitches. Compliance docs
(THIRD_PARTY_NOTICES, PRIVACY, COPYRIGHT) refreshed to v1.0.3.

Highlights
- ExtraChat IPC state synchronised across threads
- ChatLogWindow autocomplete no longer leaks the unmanaged
  ImGuiListClipper allocation
- ChatLogWindow + Popout style stack stays balanced when config
  toggles mid-frame
- Retention sweep and privacy cleanup wait for the actual filter
  pass instead of the fire-and-forget Task that started it
- Configuration.LatestVersion bumped to 13 to match the active
  migration path
- GameFunctions placeholder buffer guarded against oversized
  replacement names
- TellTarget.IsSet, ResolveTempInputChannel, InputPreview, IconUtil,
  Lender, Payloads, ExtraPayload all hardened against null / empty /
  EOF / cycle inputs
- FontManager Lodestone download stays in scope for a follow-up
  (timeout + lazy init pending)
- AutoTranslate replaced the msvcrt.dll memcmp P/Invoke with a
  managed Span comparison
- Privacy cleanup worker thread marked IsBackground = true
- Database cleanup now removes both legacy files in one click
- Tell-target name redacted in the verbose debug log

Compliance
- THIRD_PARTY_NOTICES: last-reviewed bumped to v1.0.3, Pidgin 3.5.1,
  SQLitePCLRaw.lib.e_sqlite3 3.50.3 listed as direct dependency with
  CVE-2025-6965 / CVE-2025-7709 rationale
- PRIVACY: last-reviewed bumped to v1.0.3, BetterTTV trigger wording
  clarified (list fetch at startup vs. on-demand image fetch)
- COPYRIGHT: upstream attribution range widened

Build: 0 warnings, 0 errors. No behavioural changes that would alter
existing user configuration or stored chat history.

HellionChat/Plugin.cs

@@ -529,10 +529,15 @@ public sealed class Plugin : IDalamudPlugin
                 if (deleted > 0)
                 {
                     Log.Information($"Retention sweep deleted {deleted} expired messages.");
+                    // Run the clear+refilter synchronously on the framework thread.
+                    // Earlier this called FilterAllTabsAsync(), which is fire-and-forget
+                    // — the .Wait() here would return as soon as the inner Task.Run was
+                    // dispatched, racing the next sweep cycle against the still-running
+                    // filter pass. See AUDIT-2026-05-05 [QUAL-02].
                     Framework.Run(() =>
                     {
                         MessageManager.ClearAllTabs();
-                        MessageManager.FilterAllTabsAsync();
+                        MessageManager.FilterAllTabs();
                     }).Wait();
                 }
                 else