* feat(text): Add n-gram matching for multi-word custom word correction
Improves custom word matching to handle speech artifacts where a single
word gets transcribed as multiple words (e.g., "Charge B" -> "ChargeBee",
"Chat G P T" -> "ChatGPT").
- Implements greedy n-gram matching (3 to 1 words) for better accuracy
- Adds length-based filtering (25% max difference) to prevent over-matching
- Extracts matching logic into reusable find_best_match function
- Preserves punctuation and case from original transcription
- Adds comprehensive test coverage for n-gram scenarios
* minor tweak
* format
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Co-authored-by: CJ Pais <cj@cjpais.com>
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