refactor(office): reorganize office layout with topbar navigation

[jlia0]

Summary

Move navigation items from sidebar into a top bar within the office layout. Reorganize routes into (office) layout group with the office page as the main entry point. Update sidebar hiding logic to account for new office routes. Make agent characters clickable to open detail panel.

Changes

• Create (office) layout group with dedicated topbar navigation
• Rename dashboard page to (office) route with office.tsx as the entry point
• Move tasks, projects routes into (office) group
• Extract agent-detail-panel component for agent information display
• Update AppShell sidebar hiding logic for new office routes
• Add onClick handler to agent characters and scene
• Reduce padding in prompt input and ensure consistent dark mode styling

Testing

• Office layout renders with topbar navigation
• Agent characters are clickable and open detail panel
• Sidebar hides for office routes
• Navigation between office sections works as expected

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