fix: unify theme system - fix theme switching persistence

- Unified localStorage key to 'theme-preference' across all components
- Fixed header.tsx using wrong localStorage key ('theme' instead of 'theme-preference')
- Added localStorage hybrid persistence for instant theme changes
- Removed router.refresh() which was causing stale data revert
- Replaced Blue theme with Sepia
- Consolidated auth() calls to prevent race conditions
- Updated UserSettingsData types to include all themes

mcp-server/node_modules/.prisma/client/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "prisma-client-695acdec538e6176bd4e5288817cc61667217cda4bd3eacb6556ee22de6c4cd1",
+  "name": "prisma-client-335178138a2302fddc6069fd0c4da8598be3b531edb6ec6288b57b847324be3b",
   "main": "index.js",
   "types": "index.d.ts",
   "browser": "index-browser.js",