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

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+## Why
+
+The current UI is locked to dark presentation, which does not match all user preferences or accessibility needs. Adding multi-theme support now improves usability and lets returning users keep a consistent visual experience.
+
+## What Changes
+
+- Add a theme switcher in the top-right header area.
+- Support four theme modes: **system**, **light**, **dark**, and **high-contrast**.
+- Render theme options as icons (not text-only controls).
+- Persist selected theme in client storage with **localStorage as primary** and **cookie fallback**.
+- Restore persisted theme for returning users.
+- Use **system** as default when no prior selection exists.
+
+## Capabilities
+
+### New Capabilities
+- `theme-switcher-control`: Provide an icon-based theme switcher in the header with system/light/dark/high-contrast options.
+- `theme-preference-persistence`: Persist and restore user-selected theme using localStorage first, with cookie fallback.
+- `theme-default-system`: Apply system theme automatically when no saved preference exists.
+
+### Modified Capabilities
+- None.
+
+## Impact
+
+- **Frontend/UI:** Header controls and global styling system updated for four theme modes.
+- **State management:** Client-side preference state handling added for theme selection and restoration.
+- **Accessibility:** High-contrast option improves readability for users needing stronger contrast.
+- **APIs/Backend:** No required backend API changes expected.