refactor: remove unused CommitTrendChart component

[wdeveloper16]

Summary

• Deletes src/components/dashboard/CommitTrendChart.tsx — exported from the dashboard barrel but never imported anywhere in the app (0 usages across the entire codebase)
• Removes its two-line re-export from src/components/dashboard/index.ts

Net: 2 files changed, 195 lines deleted.

Test plan

• npm run format:check — passes
• npm run lint — passes (0 warnings)
• npm run build — clean build, no TS errors

[xiao-xiao-mao]

This PR removes the unused CommitTrendChart component exports and the unused TEXT_OPACITY export from the theme. The cleanup looks safe and straightforward. No issues found from the diff.

[anderdc]

Closing — CommitTrendChart is actively used by open PR #284. Merging this deletion would break that work.

[wdeveloper16]

Hi, @anderdc
I noticed that the related PR: #284 was closed as not planed.
Actually, I also thought the dashboard redesign is really not necessary.
Would be you able to reopen and consider this PR again, since the commitTrendChart is really unused? 😉
Hope to keep clean and concise codebase by removing unused file or component as well.