v0.6.3: UI wording -> "messages"; folder spacing + tint

- User-facing "artifact(s)" -> "messages" across the UI (feed count, empty
  states, preview, About, Storage). Model/API/skill keep "artifact" internally
  — no agent-contract change.
- Sidebar: Keep/Deleted folders get spacing between them and share the "All
  sources" bold + blue-tint styling (special folders).
- Fix: About page points to Settings -> API Keys (was stale "Settings ->
  Account / API token").

152 tests pass; inline JS re-validated with node --check.

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

CHANGELOG.md

@@ -9,6 +9,20 @@ former name, "Daybook".)
 
 _Nothing yet._
 
+## [0.6.3] — 2026-09-07
+
+### Changed
+- **User-facing wording: "artifact(s)" → "messages"** throughout the UI (feed
+  count, empty states, preview, About, Storage). The model, API
+  (`/api/artifacts`), and posting skill keep "artifact" as the internal term —
+  no contract change for agents.
+- Sidebar: the Keep/Deleted folders now have spacing between them and share the
+  "All sources" bold+blue-tint styling (they're special folders).
+
+### Fixed
+- About page now points to Settings → API Keys (was the stale "Settings →
+  Account / personal API token").
+
 ## [0.6.2] — 2026-09-07
 
 ### Changed
@@ -221,7 +235,8 @@ First tagged release.
 - Dockerised (Gunicorn + whitenoise), SQLite, `git`-based deploy with a
   runbook (`deploy/cloud_agent_deploy.md`) and health check.
 
-[Unreleased]: https://git.cygnus.systems/peter/daybook/compare/v0.6.2...HEAD
+[Unreleased]: https://git.cygnus.systems/peter/daybook/compare/v0.6.3...HEAD
+[0.6.3]: https://git.cygnus.systems/peter/daybook/compare/v0.6.2...v0.6.3
 [0.6.2]: https://git.cygnus.systems/peter/daybook/compare/v0.6.1...v0.6.2
 [0.6.1]: https://git.cygnus.systems/peter/daybook/compare/v0.6.0...v0.6.1
 [0.6.0]: https://git.cygnus.systems/peter/daybook/compare/v0.5.1...v0.6.0