feat(home): clean up designs

[jspw]

Summary

Cleanup the UI of Dashboard and individual project view

Closes #

Changes

Type of change

• Bug fix
• New feature
• Improvement / refactor
• Documentation
• Chore / dependency update

Commit / PR title

• PR title follows Conventional Commits (type(scope): description or type: description)
• All commit messages in this PR follow Conventional Commits

Testing

• Tested in Extension Development Host (F5)
• Verified existing functionality is not broken
• Added/updated tests (if applicable)

UI changes

• No UI changes in this PR
• Follows the design system (VS Code CSS variables, no hardcoded colors, no external UI libs) — run /ui-patterns for reference
• Tested on both dark and light VS Code themes

Checklist

• This PR targets dev (feature/fix work should not target main)
• My code follows the project's coding conventions
• I have read the CONTRIBUTING guide
• No new dependencies added without discussion
• No console.log or debug statements left in
• If this PR will be merged to main, it will use Squash and merge or Rebase and merge instead of Create a merge commit