Fix CI checks polling feedback

[AmethystLiang]

Summary\n- Make checks polling signatures order-insensitive so provider ordering flaps do not reset backoff\n- Preserve checks polling backoff during comment-only entry refreshes\n- Add focused coverage for reordered check arrays\n\n## Validation\n- pnpm exec vitest run --config config/vitest.config.ts src/renderer/src/components/right-sidebar/checks-panel-polling.test.ts\n- pnpm run typecheck:web\n- git diff --check --cached

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 1445f873-3f4c-46e7-952f-3e6a1e54f6a8

📥 Commits

Reviewing files that changed from the base of the PR and between 9c8d9be and 3891b29.

📒 Files selected for processing (3)

• src/renderer/src/components/right-sidebar/ChecksPanel.tsx
• src/renderer/src/components/right-sidebar/checks-panel-polling.test.ts
• src/renderer/src/components/right-sidebar/checks-panel-polling.ts

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📝 Walkthrough

Walkthrough

This PR fixes the checks polling backoff mechanism in two parts. First, it makes the checks signature computation stable against array reordering by mapping each check to a structured key of name, status, and conclusion, then sorting these keys before stringification. Second, it guards the polling state reset in ChecksPanel to occur only when the entry refresh will actually fetch checks, preventing comment-only refreshes from resetting the backoff baseline. A new test verifies the backoff remains consistent even when check ordering changes.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description covers the three main objectives (order-insensitive signatures, backoff preservation, and test coverage) and includes validation steps, but is missing required sections like Screenshots, Testing checklist, AI Review Report, and Security Audit from the template.	Add the missing template sections: Screenshots (with 'No visual change' if applicable), complete Testing checklist items, AI Review Report with cross-platform compatibility verification, and Security Audit summary.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Fix CI checks polling feedback' directly relates to the main changes: fixing checks polling behavior by making signatures order-insensitive and preserving backoff during comment-only refreshes.
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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