Isolate command palette renders

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What Changed

• Moved command palette dialog state/effects into a sibling controller so the app shell (AppSidebarLayout/Outlet) is no longer rendered under CommandDialog.Root.
• Changed the sidebar search trigger to open the palette through the existing command palette store instead of requiring Base UI dialog context above the whole app.
• Extracted the command palette effects touched by this change into named hooks.

Why

react-doctor plus a manual hot-path pass identified CommandPalette as a high-blast-radius render risk: the dialog root previously wrapped the entire sidebar and routed chat UI. Isolating the dialog/controller keeps palette open/close state changes out of the app shell subtree while preserving the composer handle context.

UI Changes

Behavior should be unchanged. React Scan before/after recordings were captured for the same interaction: open command palette, type settings, close, reopen, close.

• Before recording: /workspace/react-scan-recordings/before-command-palette.webm
• After recording: /workspace/react-scan-recordings/after-command-palette.webm
• Preview frames also captured in /workspace/react-scan-recordings/before-frame.png and /workspace/react-scan-recordings/after-frame.png

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Validation:

• bun fmt
• bun lint (passes with existing warnings, 0 errors)
• bun typecheck
• bunx react-doctor@latest . --verbose (73/100, 253 existing findings across 88 files)

  

Note

Isolate command palette renders into dedicated controller and dialog components

• Refactors CommandPalette.tsx by extracting keyboard shortcut handling, open-state management, and dialog rendering into separate components (CommandPaletteController, CommandPaletteDialog) and hooks (useCommandPaletteShortcut, useCloseCommandPaletteOnUnmount).
• Extracts browse-path prefetching into usePrefetchBrowsePaths and add-project intent handling into useOpenAddProjectIntent to reduce the size of OpenCommandPaletteDialog.
• Updates Sidebar.tsx to replace CommandDialogTrigger with a direct SidebarMenuButton that calls useCommandPaletteStore to open the palette.

^{Macroscope summarized 7dbf310.}