chore: bump version to 1.4.7, sync changelog and forge post

- csproj <Version> -> 1.4.7
- repo.json AssemblyVersion + TestingAssemblyVersion -> 1.4.7.0
- repo.json DownloadLink{Install,Update,Testing} URLs -> /v1.4.7/
- repo.json + HellionChat.yaml changelog: prepend v1.4.7 block, retire
  v1.4.3 (slim rule keeps the last 3-4 versions)
- docs/CHANGELOG.md + docs/ROADMAP.md: v1.4.7 section, next-cycle
  pointer flipped to v1.4.8 Hook-Layer-Cycle
- README.md release badge + version stamps + Project Status block
  rewritten for v1.4.7
- .github/forge-posts/v1.4.7.md (new): DE body with subtitle
  "Backlog Cleanup and Mid-Features" / versionsnatur "Mid-Feature-Patch"
- Pin diagnostic logs (RehydratePinnedTabs / TryPin / Unpin /
  PromoteToPermanent) downgraded from Info to Debug so non-debug
  console stays quiet on release builds

docs/CHANGELOG.md

@@ -10,6 +10,45 @@ to the release pages for details.
 
 ---
 
+## Hellion Chat 1.4.7 — Backlog Cleanup and Mid-Features (2026-05-13)
+
+Eighth sub-patch of the v1.4.x polish-sweep series. First user-visible feature bundle since v1.4.5 — pinned tell tabs
+that survive relog, opt-in Honorific glow rendering, a configurable sidebar, plus a Settings-Save channel-preservation
+fix surfaced during smoke testing.
+
+- TempTell Pin: right-click a TempTell tab in the sidebar and choose "Pin Tab" / "Tab anpinnen". Pinned tabs survive
+  plugin reload and character logout, keep their conversation history (loaded on demand from the message store on
+  rehydrate), and stay bound to the same `/tell` partner. Hard cap of 5 pinned tabs in a pool separate from the 15-tab
+  auto-tell pool — total ceiling is 20 tabs. The sidebar groups pinned tabs into their own section with a divider header
+- Honorific glow outlines now render via an 8-direction DrawList pre-pass when the title carries a Glow colour. Opt-in
+  via **Settings → Integrations → Render glow outlines (Honorific)** (default off). Honorific's gradient surface
+  (`Color3`, `GradientColourSet`, `GradientAnimationStyle`) is parsed and stashed for a later cycle but renders as the
+  primary colour until then — the v1.4.7 DTO already mirrors all four extra fields so the JSON roundtrip doesn't
+  silent-drop them
+- Sidebar width configurable in **Theme & Layout** (44–160 px, default 44 stays icon-only). The icon button stretches
+  with the configured width so a widened sidebar looks intentional, not a 36 px icon floating in empty space
+- `Configuration.UpdateFrom` now preserves the runtime `CurrentChannel` across the persistent-tab merge alongside
+  `Messages` and `LastSendUnread`. `TabSwitched` deep-clones the seeded channel from the previous tab instead of sharing
+  the same `UsedChannel` instance. Together these fix a regression where Settings-Save on a Party or Linkshell tab
+  popped the chat input back to `/tell <pinned-partner>` on the next interaction
+- `Util/ImGuiUtil.cs` `DrawArrows` IconButton id uses `(id + 1).ToString()` with explicit parentheses instead of the
+  operator-precedence quirk `id + 1.ToString()` (which resolved to `id.ToString() + "1"`). Single live caller is
+  `Ui/DbViewer.cs:227` page-navigation
+- Internal: `IPluginLogProxy` indirection over Dalamud's `IPluginLog` routes all ~91 `Plugin.Log` call sites through a
+  testable proxy. `MessageStore.Migrate0` can now run in xUnit without loading `Dalamud.dll`, closing the gap F12.1 left
+  in v1.4.6. Production wrapper `DalamudPluginLogProxy` and Build-Suite `FakePluginLogProxy` mirror the full
+  `IPluginLog` surface (`Verbose`/`Debug`/`Information`/`Info`/`Warning`/`Error`/`Fatal`) with single-string,
+  `Exception+string`, and `params object[]` overloads
+- Internal: TempTab counter switched from an `Interlocked` cached field to a derived `Tabs.Count(predicate)`. Pin-state
+  transitions (TryPin / Unpin / Promote) are cold-path and don't need lock-free reads; counter mutation surface dropped
+  from 5 to 0 sites. Build-Suite floor 688 → 710 (+22)
+- Schema bump v16 → v17 is additive: new `Tab.IsPinned` bool, default false. Existing v16 configs load cleanly and get
+  their `Version` stamp bumped after the gate check
+
+Based on Chat 2 1.35.3 (upstream Infiziert90/ChatTwo, EUPL-1.2).
+
+---
+
 ## Hellion Chat 1.4.6 — Code Hygiene and Refactor (2026-05-12)
 
 Maintenance patch. No user-visible behaviour changes; tightens the development feedback loop, fixes two