feat: enhance TextMate grammar for colored output channel

[recca0120]

Summary

• Enhanced TextMate grammar (collision.tmLanguage.json) for syntax-highlighted PHPUnit/Pest output
• Added 2-space indent to CollisionPrinter test result lines for grammar matching
• Embedded PHP syntax highlighting in source code snippets via include: source.php
• Colored output: green (passed), red (failed), yellow (skipped), gray (duration/info), blue (file links)

Test plan

• npx vitest run — all tests pass
• pnpm run typecheck — no type errors

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.48%. Comparing base (01438e9) to head (e937874).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #351   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files          77       77           
  Lines        2813     2813           
  Branches      495      495           
=======================================
  Hits         2658     2658           
  Misses        140      140           
  Partials       15       15           

Flag	Coverage Δ
unittests	94.48% <100.00%> (ø)

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