Support repository-aware labels for GitHub blob URL smart chips

[Copilot]

Description:

Direct GitHub file links were rendered as repository chips, hiding file context. This change updates blob URL chips to include the repository name (without owner) and handle long paths while preserving existing behavior for repo/issue/PR/user/project URLs.

• URL parsing

  • parseGitHubURL detects blob file URLs and extracts path.
  • GitHubURLInfo includes optional path?: string.

• Chip title selection

  • Blob URL titles now use:
    • (repository name without owner)/(path) when the title is less than 60 characters.
    • (repository name without owner) - (base file name) when the full path title is 60+ characters.
  • onLinkPreview applies this title formatting before rendering repository cards.
  • createRepositoryCard continues supporting an optional title override (default: data.full_name).

• Coverage updates

  • Added/updated tests for blob path parsing, repository card custom title support, and end-to-end preview title behavior for:
    • normal blob paths
    • long blob paths with basename fallback

const filePattern = /github\.com\/([^/]+)\/([^/]+)\/blob\/[^/]+\/([^?#]+)/;
// ...
const title = urlInfo.path
  ? createRepositoryTitle(repo.name, urlInfo.path)
  : undefined;
card = createRepositoryCard(repo, title);

Related Issues:

• [feature] Support file URLs

Checklist:

• Review the CONTRIBUTING.md documentation.
• Add a reference to a related issue in the repository.
• Add a description of the changes proposed in the pull request.
• Add unit tests if applicable.
• Update documentation if applicable.
• Add a note in the CHANGELOG.md if applicable.

[ianlewis]

@copilot The title should include the repo name in addition to the filename. It should also handle situations where the path is very long.

The title should be (repository name without owner)(path) if less than 60 characters. Otherwise, it should be (repository name without owner) - (base file name).

[Copilot]

Updated in ee760d8. Blob URL titles now use repoName/path when the result is under 60 chars, and fall back to repoName - basename for long paths. I also updated src/addon.test.ts to cover both title formats.