chore: bump version to 1.4.8, sync manifest

- csproj <Version>, Plugin.cs schema-gate self-reference, repo.json
  (AssemblyVersion, TestingAssemblyVersion, 3x DownloadLink URLs).
- README.md shield badge, version header, Project Status body.
- docs/CHANGELOG.md gains a v1.4.8 section above v1.4.7.
- docs/ROADMAP.md flips Next Cycle to v1.4.9 (Plugin-Load Render
  Polish), v1.4.8 moves into the released history above v1.4.7.
- Config schema stays at v17, Migration v17 stays additive.

repo.json Changelog field and HellionChat.yaml changelog block plus
the new forge-posts/v1.4.8.md follow in a separate commit (slim-drop
of v1.4.4 happens there).

docs/ROADMAP.md

@@ -10,11 +10,28 @@ the plugin's privacy-first scope during brainstorming.
 
 ---
 
-## Next Cycle (v1.4.8)
+## Next Cycle (v1.4.9)
 
-**Hook-Layer Cycle.** Receive-suppressed-tells toggle (cross-reference XIVIM #73 bubble-layer sub-task), Database Viewer
-full-text search via SQLite FTS5, plus preparation for the later Ad-Block cycle. Hook-layer investigation is shared
-across these items so they cluster naturally in one sub-patch.
+**Plugin-Load Render Polish.** Erststart-Frame-Hitch (~110 ms UiBuilder) and the related Font-Atlas + Auto-Translate
+warmup costs surface every load and are reproducible in `/xlstats`. The cycle also unblocks the lazy-window refactor
+sketched in `feedback_lazy_window_dalamud` and the slash-command centralisation that comes with it.
+
+---
+
+## v1.4.8 — Hook-Layer and Polish Quick-Wins (released 2026-05-14)
+
+Ninth sub-patch of the v1.4.x Polish Sweep series. Database Viewer gains an optional FTS5 full-text search across the
+full chat history, built asynchronously on first run after the update with a progress toast; the local page-filter
+remains the default mode. Custom theme files auto-reload when edited while the theme is active (1 Hz disk-stat throttle,
+so per-frame cost is free). Retention sweep no longer blocks the framework thread — `Framework.Run(...).Wait()` is
+replaced by `Framework.RunOnTick(...)`, removing the ~194 ms hitch per sweep. Status-bar height is now derived from
+`GetTextLineHeightWithSpacing()` plus a DPI-aware spacer so the bar renders correctly at Windows display scaling above
+100 %. Receive-suppressed-tells routing was investigated and **postponed to v1.5.x**: when other plugins suppress tells
+via `CheckMessageHandled`, FFXIV's chat-pipeline skips the `RaptureLogModule.AddMsgSourceEntry` path, which means the
+`ContentIdResolverHook` does not fire and tell-partner identification breaks. The fix belongs next to the planned ad-block
+hook layer where the same patch surface comes up anyway. Migration v17 stays (no schema bump). H3 leaves a foundation
+note in the Vault (`Projekte/FFXIV/Hellion Chat/v1.5.x Ad-Block Foundation.md`) covering the NoSoliciting filter +
+bubble-layer hook pattern as a ready-made template for the v1.5.x cycle.
 
 ---