fix(web): round the trailing PR checks hover surface

[nkumar-aw]

The checks button at the end of a thread details PR row paints a square hover surface over the row's rounded edge. Neighboring editor and Git action controls already round their outer corners.

Add last:rounded-e-lg to the checks segment. It rounds the outer edge only when checks end the row. Checks before a Fix or Merge action keep square inner corners. This is a small, focused fix for an obvious visual bug, with no product behavior change.

Verification

• Start an isolated dev server with pnpm exec vp run dev --home-dir /Users/nandakumar/Personal/t3code/.t3.
• Create a test thread and link merged PR chore(deps): upgrade @effect/tsgo to 0.46.1 #16360. Hover its green checks button. Before: all four corners measure 0px. After: right corners measure 10px; left corners stay 0px.
• Open and dismiss the checks popover. Hover remains rounded and the popover still works.
• Link failing, non-draft PR fix(server): Claude threads no longer get ACP and Codex tool instructions #16482. Checks before its Fix action still measure 0px on all corners.
• Inspect neighboring editor, Git action, branch, script, and Changes controls. Their outer corners remain rounded.
• pnpm exec vp test run apps/web/src/components/pullRequest/pullRequestDetail.logic.test.ts apps/web/src/components/ThreadStatusIndicators.test.ts: 181 tests pass.
• pnpm exec vp lint apps/web/src/components/chat/threadDetailsPanelStyles.ts: passes.
• pnpm --filter @t3tools/web typecheck: passes.
• pnpm --filter @t3tools/web build: passes, with chunk-size warnings.

Verified in the web client on macOS. Desktop uses this same web component; Electron and native mobile were not tested. Mobile viewport resizing timed out in the Browser panel. Node is v26.7.0; the repository requests ^24.13.1.

Nightlies build from main, not a separate nightly branch, so this PR targets main.

Before / after

Screenshots show the same hovered button in the dev server. The crops enlarge the panel without changing its content. Evidence lives in the fork's evidence-only prerelease, not in the code diff.

Before	After

Model: GPT-6.1 Sol (openai/gpt-6.1-sol). Harness: OpenCode through T3 Code.

[macroscopeapp]

Approvability

Verdict: Approved at 69f0ccb

Macroscope's review found this PR approvable — This focused one-line CSS-class change rounds the trailing PR checks hover surface without changing application logic or existing control behavior. Its impact is limited to presentation in the web thread-details panel.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 9503155 and 69f0ccb.

📒 Files selected for processing (1)

• apps/web/src/components/chat/threadDetailsPanelStyles.ts

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📝 Walkthrough

Walkthrough

The split-checks style now rounds the trailing end of the last segment.

Changes

Thread details panel styling

Layer / File(s)	Summary
Round the last split-checks segment apps/web/src/components/chat/threadDetailsPanelStyles.ts	THREAD_DETAILS_PANEL_SPLIT_CHECKS_CLASS adds last:rounded-e-lg to round the trailing end of the last segment.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Bug fix

Suggested reviewers: rakshithbhat03

Merge Risk: ⚪ Minimal · up to 69f0c

The change is limited to the checks segment’s trailing corner styling and does not alter when checks appear. No merge-blocking issue was identified.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: rounding the trailing hover surface for PR checks.
Description check	✅ Passed	The description explains the visual problem, the change, why the focused fix needs no prior approval, and the verification results. It also includes before-and-after screenshots and notes untested env…
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.

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[nkumar-aw]

Closing to recreate this PR from my personal account with the same fix and screenshots.

[parzival1l]

Replaced by #16548 from my personal account. This PR stays closed.