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/Util/IconUtil.cs

@@ -49,9 +49,21 @@ public readonly unsafe ref struct GfdFileView
         var entries = Entries;
         if (DirectLookup)
         {
-            if (iconId <= entries.Length)
+            // Resolve redirects on the direct-lookup path too — the binary-search
+            // path follows them, and skipping them here was inconsistent for
+            // contiguous ID sets.
+            var visited = 0;
+            while (iconId <= entries.Length)
             {
                 entry = entries[(int)(iconId - 1)];
+                if (followRedirect && entry.Redirect != 0 && entry.Redirect != iconId)
+                {
+                    if (++visited > entries.Length)
+                        break; // cycle guard
+                    iconId = entry.Redirect;
+                    continue;
+                }
+
                 return !entry.IsEmpty;
             }
 
@@ -146,12 +158,17 @@ public readonly unsafe ref struct GfdFileView
 internal static class IconUtil
 {
     private static byte[]? GfdFile;
-    public static unsafe GfdFileView GfdFileView
+    public static GfdFileView GfdFileView
     {
         get
         {
-            GfdFile ??= Plugin.DataManager.GetFile("common/font/gfdata.gfd")!.Data;
-            return new GfdFileView(new ReadOnlySpan<byte>(Unsafe.AsPointer(ref GfdFile[0]), GfdFile.Length));
+            if (GfdFile is null)
+            {
+                var file = Plugin.DataManager.GetFile("common/font/gfdata.gfd")
+                    ?? throw new FileNotFoundException("Failed to load common/font/gfdata.gfd from the game data.");
+                GfdFile = file.Data;
+            }
+            return new GfdFileView(GfdFile);
         }
     }