[codex] Fix issue 3 app launch and UI bugs

[EtienneLescot]

Summary

Fixes the three bug reports grouped in #3:

• prevent multiple OpenScreen app instances by adding Electron single-instance locking
• reduce HUD drag lag by batching drag movement IPC updates to animation frames
• tighten the editor background tab strip so the active tab no longer visually spills outside its track

Validation

• cmd /c npx biome check electron\main.ts src\components\launch\LaunchWindow.tsx src\components\video-editor\SettingsPanel.tsx
• cmd /c npx tsc --noEmit
• git diff --check

Note: full npm run lint is still blocked by pre-existing repo-wide LF/CRLF formatting diagnostics unrelated to this change.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 1415f42c-c2dd-44d0-8b40-495a2b686a0a

📥 Commits

Reviewing files that changed from the base of the PR and between 5ed545b and 5952120.

📒 Files selected for processing (3)

• electron/main.ts
• src/components/launch/LaunchWindow.tsx
• src/components/video-editor/SettingsPanel.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-issue-3

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: a08c30acb8

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