feat(command-palette): add useOpenCommandPalette hook

[IzumiSy]

Motivation

The built-in CommandPalette could only be opened via Cmd/Ctrl+K or the default sidebar entry. That made it awkward to wire palette entry points from page actions, empty states, or custom navigation UI.

This change adds a small programmatic API for opening the existing palette, while also letting callers seed the initial input so the palette can open ready to search.

Design Decision

I kept the public surface narrow with useOpenCommandPalette() instead of introducing a broader control object, ref API, or new AppShell prop.

The hook accepts an optional { search } argument. That keeps plain open as the default case, and it reuses the palette's existing input parsing rules for mode switching. For example, callers can pass PO: alice to open directly into a prefix-based search source without adding a separate source/query API.

Summary

• add useOpenCommandPalette() and export OpenCommandPaletteOptions
• support openCommandPalette({ search }) to prefill the input on open
• reuse existing prefix parsing so programmatic open can start directly in search-source mode
• add tests for the new hook and prefilled search behavior

[IzumiSy]

/review

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