feat: add GPUI app foundation with revision log display
- Set up GPUI application with main window and basic layout
- Add toolbar, sidebar (bookmarks placeholder), main content area, and status bar
- Implement repository detection by searching for .jj directory
- Add revision log view showing commit history
- Display change ID, description, author, timestamp for each revision
- Show working copy (@) and immutable (◆) markers
- Support bookmark indicators on revisions
- Highlight selected revision in the log
- Add FP issue tracking for project tasks
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