Add appearance theme support (dark/light/system) using CSS custom
property overrides. In light mode the Tailwind zinc scale is inverted
and semantic surface/border tokens are swapped, so all existing
utility classes pick up the new palette automatically.
- Add AppearanceTheme type and theme field to WorkspaceSettings
- Add setTheme IPC channel wiring (contracts, preload, handler, service)
- Add [data-theme='light'] CSS overrides for zinc scale, surface tokens,
scrollbar, and markdown prose colours
- Add Appearance section to SettingsPanel with radio-button theme picker
- Apply data-theme attribute on document root via useEffect in App.tsx,
with matchMedia listener for the system option
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Add persisted session and pattern metadata for pinning, archiving, manual titles, and favorite patterns. Expose backend query and mutation APIs for session library features, and cover the shared helpers with tests.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Add backend support for Copilot connection and account-status UX without introducing raw provider credential management.
This change extends sidecar capabilities with explicit connection diagnostics, adds a refreshable capabilities IPC path, classifies common Copilot CLI failure modes, and includes a frontend handover document describing the new payload and expected UI states.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
