fix: keyboard shortcuts in packaged app

[Dhruv-Sharma29]

Summary

Fixes keyboard shortcuts becoming unreliable in the packaged Tauri desktop app.

Changes

• Register the global keyboard shortcut handler during the capture phase.
• Prevent Monaco and WebView handlers from swallowing application shortcuts.
• Ignore shortcuts while IME composition is active.
• Preserve existing shortcut behavior in development mode.

Testing

• git diff --check passes.
• Frontend build could not be run because dependencies are not installed.

closes #214

[Copilot]

🔵 Needs a closer look

Shortcut/event-order changes in a packaged desktop WebView context are hard to validate here (and the frontend build/tests were not run), so a human verification pass is warranted.

Pull request overview

This PR adjusts the frontend keyboard shortcut listener so application shortcuts remain reliable in the packaged Tauri desktop app, particularly when focus is inside Monaco/WebView-controlled elements.

Changes:

• Register the window keydown listener in the capture phase to avoid missing events swallowed during bubbling.
• Skip shortcut handling while IME composition is active via event.isComposing.

File summaries

File	Description
frontend/src/app/page.tsx	Move shortcut handling to capture-phase keydown and ignore IME composition events to improve shortcut reliability in packaged Tauri.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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