fix(web): hide back button for single linked pull requests

[maria-rcks]

Hide the linked-pull-request back button when a thread has only one visible linked PR. Threads with multiple visible PRs retain navigation to their list; the standalone pull requests page already omits this button.

Verified in the real web client with GitHub PR data: single-PR thread header hides the arrow, and the standalone PR page has no arrow. Blacksmith web typecheck, scoped lint (existing warnings), and 111 existing PR detail/list tests passed. Multi-PR runtime verification and the CI watcher are blocked by GitHub's rate limit; source review confirms the existing multi-PR action is preserved.

Before:

After:

Pull requests page:

Implemented with GPT-6 in Codex.

[macroscopeapp]

Approvability

Verdict: Approved at 8b143c4

Macroscope's review found this PR approvable — This is a focused one-file UI bug fix that hides an unnecessary back button when a thread has only one visible linked pull request. Existing pull-request availability and data behavior remain unchanged, with no schema, security, infrastructure, or default-setting impact.

Notes:

• Diff unchanged. Approvability was decided on eligibility alone.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: fa32294e-8b7d-41dd-80b6-d022485e80c7

📥 Commits

Reviewing files that changed from the base of the PR and between 0c5771d and 8b143c4.

📒 Files selected for processing (1)

• apps/web/src/components/ChatView.tsx

Included review availability: Your plan provides up to 10 included reviews per hour; 6 remain after this review.

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📝 Walkthrough

Walkthrough

Changes

Pull Request Navigation

Layer / File(s)	Summary
Visible pull request navigation apps/web/src/components/ChatView.tsx	ChatView counts visible pull requests. PullRequestDetailPanel.onBack is supplied only when more than one visible pull request exists.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Suggested reviewers: t3dotgg

Merge Risk: ⚪ Minimal · up to 8b143

This change safely hides the back button for standalone linked pull requests while preserving navigation for lists with multiple pull requests.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the primary change: hiding the back button for a single linked pull request.
Description check	✅ Passed	The description explains what changed, why it changed, verification results, limitations, and UI changes with before/after screenshots. It does not use the template headings or include the checklist, …

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Dismissing prior approval to re-evaluate 8b143c4