- Move room navigation from sidebar to top header bar as icons
- Add circular "bulge" extending below header for larger logo (120px)
- Logo centered in bulge with 20% circle below header line
- Profile dropdown with Settings and Logout options
- Header overlays content (Stack layout) instead of pushing it down
- Remove AppBar from FrontHallPage (provided by AppScaffold)
- Add transparent logo asset
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
