feat: wrap HUD output in markdown blockquote for dim styling

[ComBba]

Summary

Wraps HUD line in markdown blockquote for dim/muted appearance.

Why

ANSI dim codes cause TUI rendering bugs; blockquotes use theme's markdownBlockQuote color which maps to muted colors in most themes.

Changes

• appendUsageLineToOutputText() adds > prefix
• Tests updated

Note

Theme-dependent — most popular themes (one-dark, aura, kanagawa) render blockquotes in muted gray; some themes (catppuccin) render in yellow.

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📥 Commits

Reviewing files that changed from the base of the PR and between 897bbc0 and 088405a.

📒 Files selected for processing (2)

• src/plugin.ts
• tests/build-usage-line.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/blockquote-hud

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