fix(app): hide child sessions from sidebar root window

[Astro-Han]

Summary

Filter child/subagent sessions out of the PawWork sidebar root session window. Current child sessions still appear under their parent session through the existing showChild path.

Why

When the active session is a subagent child session, buildPawworkSessionWindow was merging that active child into the top-level sidebar rows. The parent row also renders the current child below it, so the same subagent session title appeared twice.

Related Issue

No GitHub issue yet. Reported from v2026.5.5 sidebar behavior.

Human Review Status

Pending. A human should make the final merge decision after reviewing the final diff and verification evidence.

Review Focus

Check that root sessions still stay visible when pinned or active, while child sessions from normal, pinned, or active inputs do not become top-level sidebar rows.

Risk Notes

Low. This changes only the sidebar window helper. It does not change session storage, subagent creation, titles, routing, or the child-row rendering path.

How To Verify

Focused layout tests: 45 passed
Command: bun test --preload ./happydom.ts src/pages/layout/helpers.test.ts src/pages/layout/pawwork-session-nav.test.ts src/pages/layout/pawwork-session-window.test.ts
App typecheck: passed
Command: bun run typecheck
Diff check: no whitespace errors
Command: git diff --check

Screenshots or Recordings

Not captured. The changed behavior is covered at the sidebar window data-helper level; Electron manual verification was not run.

Checklist

• Human review status is stated above as pending, approved, or not required
• I linked the related issue, or stated why there is no issue
• This PR has type, primary area, and priority labels, or I requested maintainer labeling
• I described the review focus and any meaningful risks
• I listed the relevant verification steps and the key result for each
• I did not introduce unrelated refactors, dependencies, generated files, or file changes beyond the stated scope
• I manually checked visible UI or copy changes when needed, with screenshots or recordings
• I considered macOS and Windows impact for platform, packaging, updater, signing, paths, shell, or permissions changes
• I called out docs, release notes, dependencies, permissions, credentials, deletion behavior, generated content, or local file changes when relevant
• I reviewed the final diff for unrelated changes and suspicious dependency changes
• I am targeting dev, and my PR title and commit messages use Conventional Commits in English

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: a552cd2b-8085-419f-b741-092c390517c8

📥 Commits

Reviewing files that changed from the base of the PR and between b917193 and 746ce1c.

📒 Files selected for processing (3)

• packages/app/src/pages/layout.tsx
• packages/app/src/pages/layout/pawwork-session-window.test.ts
• packages/app/src/pages/layout/pawwork-session-window.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-subagent-sidebar-duplicate

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[gemini-code-assist]

Code Review

This pull request updates the session window logic to ensure that only root sessions (those without a parentID) are displayed in the top-level sidebar. It introduces a rootSessions helper function and updates buildPawworkSessionWindow to filter normal, pinned, and active sessions. Corresponding tests have been added to verify this behavior. The review feedback suggests improving the rootSessions helper with defensive checks to handle potentially null or undefined items in the session array.

[Astro-Han]

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Review triggered.

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