(CODUX-119) Document desktop system bar behavior

[numnx]

🧩 Task: Document desktop system bar behavior

Automated task PR opened by Code UX for T03.

📋 Summary

Sprint: Sprint 187 · Fix System Bar · Task: T03

Restore the Electron desktop system bar so it is visible in the app, shows the Code UX version, exposes an update action, and reliably supports maximize/restore by double-clicking the bar.

🤖 Model & Provider

Provider	Codex CLI
Model	gpt-5.5

⏱️ Timing

Started	2026-07-08 13:14:00 UTC
Finished	2026-07-08 13:16:53 UTC
Duration	2m 53s

📊 Token Usage

Metric	Value
Input tokens	62,426
Cached input tokens	647,424
Output tokens	6,106
Total tokens	715,956
Invocations	1
Tool calls	31
Active time	2m 33s

Included usage estimate (subscription/local login): $0.82

✅ QA Review

⏳ QA review runs after this PR is opened. Check the task card in the dashboard for the outcome once it lands.

📝 Full Task Prompt

## Objective
Document the restored Electron desktop system bar behavior so future changes preserve the visible version label, update action, and double-click maximize/restore contract.

## Scope
- Edit `docs/deployment/electron-desktop.md`
- Edit `docs/dashboard/design-system-shell-navigation.md`
- Edit `docs-web/user/installation.md`
- Existing docs links in `docs/index.md` and `docs/SUMMARY.md` already include the Electron desktop page, so only verify them unless a new page is created
- Documents behavior implemented by T01 and T02

## Implementation Requirements
1. Add a concise section to `docs/deployment/electron-desktop.md` describing the frameless desktop system bar, version label from `package.json`/`__APP_VERSION__`, update button behavior, preload IPC boundary, and double-click maximize/restore behavior.
2. Extend `docs/dashboard/design-system-shell-navigation.md` with system-bar design constraints: compact `h-9` chrome, no-drag interactive controls, accessible labels, and stable behavior across macOS traffic lights and Windows/Linux custom controls.
3. Update `docs-web/user/installation.md` under Updating or Desktop app notes to explain that the desktop title bar update button opens the latest GitHub Releases page and does not perform an in-app automatic update.
4. Verify `docs/index.md` and `docs/SUMMARY.md` still link to `docs/deployment/electron-desktop.md`; only edit those files if the documentation structure changes.

## Constraints
- Do not claim Code UX has automatic background updates unless code implementing that exists.
- Keep docs user-facing where appropriate and avoid raw implementation-only wording in `docs-web/user/installation.md`.
- Preserve existing release artifact and installer guidance.
- Do not add a new docs page unless the existing Electron page cannot house the behavior cleanly.

## Verification
- Run `pnpm run lint`.
- Manually verify the updated docs mention version display, update button behavior, and double-click maximize/restore exactly once in the relevant desktop sections.
- Success means docs match the implemented behavior and no TypeScript/lint errors are introduced.

🌿 Branch Info

Base: feature/CODUX-187-fix-system-bar
Head: task/feature-codux-187-fix-system-bar-t03-codex-mrc3mzx3

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🤖 Generated by Code UX