fix: CamelCase author names fail automatic search matching

[rinseaid]

Summary

• Authors with CamelCase prefixes (Mc, Mac) silently fail automatic search
• scoreMatch() calls .toLowerCase() before parsing authors, destroying the casing that normalizeForMatching() relies on to split prefixes like "McGowan" → "Mc Gowan"
• The CamelCase split regex /([a-z])([A-Z])/g never matches on already-lowercased input, so "mcgowan" stays unsplit and fails the author presence check
• Automatic mode sets requireAuthor: true, so these results get matchScore: 0 and fall below the 50-point threshold
• Interactive search is unaffected because it uses requireAuthor: false
• Affected names include McGowan, McFadden, McAllister, McGinnis, and any Mc/Mac prefix author

Files Changed

File	Change
src/lib/utils/ranking-algorithm.ts	Remove premature .toLowerCase() before author parsing so CamelCase survives into normalizeForMatching(). Add /i flag to split regex, move lowercase into filter comparison.
tests/utils/ranking-algorithm.test.ts	Add test cases for CamelCase author name matching (McGowan, McFadden)

Testing

• All existing tests pass (vitest run)
• Existing McFadden test (expects matchScore < 45 for title mismatch) still passes at 37.5
• New tests verify McGowan and McFadden score ≥ 50 when title and author both match
• Verified against live Prowlarr results: McGowan "The Housekeeper" scores 78 with fix vs 0 without

AI Disclosure

Found the bug manually by tracing why automatic searches kept returning 0 grabs for Mc-prefix authors. Used Claude to help develop and validate the fix. All changes reviewed and tested against a live instance.