bulk commit changes!

openspec/changes/archive/2026-02-13-p06-theming/tasks.md

@@ -0,0 +1,26 @@
+## 1. Theme Foundation
+
+- [x] 1.1 Define root-level theme state model for system, light, dark, and high-contrast
+- [x] 1.2 Add CSS token/variable mapping so all theme modes can be resolved consistently
+
+## 2. Theme Switcher UI
+
+- [x] 2.1 Add icon-based theme switcher control to top-right header area
+- [x] 2.2 Provide accessible labels and active-state indication for each icon option
+
+## 3. Theme Preference Persistence
+
+- [x] 3.1 Persist selected theme in localStorage when available
+- [x] 3.2 Implement cookie fallback persistence when localStorage is unavailable
+- [x] 3.3 Restore persisted preference for returning users
+
+## 4. System Default Behavior
+
+- [x] 4.1 Apply system mode when no persisted preference exists
+- [x] 4.2 Ensure saved user preference overrides system default on subsequent visits
+
+## 5. Validation and Documentation
+
+- [x] 5.1 Validate theme switching and persistence across refreshes and browser restarts
+- [x] 5.2 Validate icon controls with keyboard navigation and screen reader labels
+- [x] 5.3 Update README/docs with theme options and persistence behavior