fix: balance Workbench pinned grid

[jonathanperis]

Summary

• Balance the Workbench pinned-card grid around GitHub's six-profile-pin limit
• Give the sixth pinned card a deterministic wide span so it reaches the right edge instead of rendering as a skinny orphan
• Add odd-count fallback spans so one/three/five pinned cards do not leave an orphaned final row

Test Plan

• git diff --check
• bun run lint
• PUBLIC_GA_ID=G-35CN95481D bun run build (with local GitHub auth token available for live repo data)
• Local preview visual check: final speedy-bird-lynx card reaches the right edge of the Workbench grid

Summary by CodeRabbit

• Bug Fixes
  • Improved responsive layout behavior for revealed items in the workbench grid.
  • Single-item and certain last-item grid placements now expand correctly across the full width.
  • Adjusted item spanning rules to create more consistent column placement across different list sizes.

[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: Pro Plus

Run ID: 2699e689-3314-40bf-bcf1-059160b8c42f

📥 Commits

Reviewing files that changed from the base of the PR and between bb0ae45 and 78be4ee.

📒 Files selected for processing (1)

• src/styles/globals.css

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📝 Walkthrough

Walkthrough

Updated .workbench-grid child reveal column spans in src/styles/globals.css, including revised nth-child placements and additional full-width cases for single and selected last items.

Changes

Workbench grid reveal placement

Layer / File(s)	Summary
Grid span rules src/styles/globals.css	The .reveal placement rules in .workbench-grid use revised nth-child spans and additional full-width cases for single and selected last items.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: balancing the Workbench pinned grid layout.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/workbench-pinned-grid

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