Unify right panel with tabbed Files/Editor/Diffs views

[BunsDev]

Summary

• Move workspace file tree from the left sidebar into a unified right panel alongside the code editor and diff viewer
• Add a minimal tab header with icon+label toggle buttons (Files, Editor, Diffs) to switch between panel views, inspired by the Vercel PR diff UI
• Replace three separate SidebarProvider instances with a single resizable sidebar coordinated via a new Zustand store (rightPanelStore)
• Sync existing codeViewerStore and diffViewerStore opens/closes with the unified panel via effects
• Maintain mobile support via Sheet wrapper for the right panel content

Files changed

• rightPanelStore.ts — New Zustand store for unified right panel state (tab + open/close), persisted to localStorage
• RightPanelHeader.tsx — New minimal header component with icon+label toggle buttons and close button
• _chat.$threadId.tsx — Major rewrite replacing 3 separate sidebar providers with single unified right sidebar
• Sidebar.tsx — Remove inline file tree; replace show/hide toggle with "Open file tree" button that opens right panel
• HeaderPanelsMenu.tsx — Use rightPanelStore directly for Files/Editor/Diffs toggles
• ChatHeader.tsx — Simplify props passed to HeaderPanelsMenu
• useLayoutActions.ts — Point code viewer and diff viewer sidebar width keys to shared right panel key

Test plan

• Verify file tree appears in right panel "Files" tab
• Verify code editor appears in right panel "Editor" tab
• Verify diff viewer appears in right panel "Diffs" tab
• Verify tab toggle buttons work (clicking active tab closes panel)
• Verify mobile sheet wrapper works on small viewports
• Verify panel state persists across page reloads
• Verify existing code viewer and diff viewer store integrations still work

🤖 Generated with Claude Code

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