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

_bmad/bmm/workflows/bmad-quick-flow/quick-dev/steps/step-06-resolve-findings.md

@@ -3,7 +3,7 @@ name: 'step-06-resolve-findings'
 description: 'Handle review findings interactively, apply fixes, update tech-spec with final status'
 
 workflow_path: '{project-root}/_bmad/bmm/workflows/bmad-quick-flow/quick-dev'
-thisStepFile: '{workflow_path}/steps/step-06-resolve-findings.md'
+thisStepFile: './step-06-resolve-findings.md'
 ---
 
 # Step 6: Resolve Findings