feat(sidebar): add Mod+B keybinding to toggle sidebar

[sak0a]

Summary

• Adds sidebar.toggle command mapped to Mod+B (⌘B on Mac, Ctrl+B on other platforms)
• Implements global shortcut handler at the SidebarProvider level so toggle works across all routes
• Persists sidebar open/closed state to cookie (sidebar_state) for retention across reloads
• Updates SidebarTrigger visibility to respect sidebar state via data-state attribute
• Adds new Sidebar keybinding category in settings (between Command Palette and Chat)
• Includes comprehensive tests for shortcut resolution and label generation

Testing

• ✅ Keybinding test verifies Mod+B resolves to sidebar.toggle when terminal not focused
• ✅ Keybinding test verifies Mod+B is ignored when terminal is focused
• ✅ Label generation test confirms shortcut displays as ⌘B on Mac, Ctrl+B on other platforms
• Manual: Test toggle works in chat view
• Manual: Test toggle works in settings view
• Manual: Test toggle works in no-active-thread state
• Manual: Verify sidebar state persists across page reload
• Manual: Verify Mod+B doesn't toggle sidebar when typing in composer

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a2747075-6ec8-4ee3-9c96-f64c239bcf60

📥 Commits

Reviewing files that changed from the base of the PR and between a68d236 and d56c535.

📒 Files selected for processing (10)

• apps/web/src/components/AppSidebarLayout.tsx
• apps/web/src/components/NoActiveThreadState.tsx
• apps/web/src/components/chat/ChatHeader.tsx
• apps/web/src/components/ui/sidebar.tsx
• apps/web/src/keybindings.test.ts
• apps/web/src/lib/keybindingCategories.ts
• apps/web/src/routes/_chat.index.tsx
• apps/web/src/routes/_settings.diagnostics.tsx
• packages/contracts/src/keybindings.ts
• packages/shared/src/keybindings.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/port-3497-sidebar-toggle

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