feat: add shared toolbox header and appearance

CHANGELOG.md

@@ -3,6 +3,24 @@
 All notable changes to the independently versioned Toolbox SDK packages are
 recorded here. The packages currently share one release version.
 
+## 0.2.0 — 2026-07-22
+
+### Added
+
+- A reusable, genuinely centered `ToolboxHeader` with standard Help, Gitea
+  source, Personalize, and Apps controls.
+- Shared versioned browser preferences in `@add-ideas/toolbox-contract`, using
+  the portal's existing storage key so light, dark, and system mode follow the
+  user between same-origin Toolbox apps.
+
+### Changed
+
+- `AppShell` now uses the common top bar in both connected and standalone mode,
+  derives its source link from manifest metadata, and offers app switching from
+  a consistent Apps menu.
+- Explicit relative `manifestUrl` values now resolve against the deployed page
+  URL, including nested-path deployments.
+
 ## 0.1.1 — 2026-07-20
 
 ### Fixed