Remove unused import in SentenceBoundaryDetector.test.ts

[ysdede]

What:
Removed the unused type DetectorWord import from src/lib/transcription/SentenceBoundaryDetector.test.ts and eliminated unnecessary explicit type annotations in the file.

Why:
Removing unused code, particularly redundant imports and explicitly typed variables that can be structurally inferred by TypeScript, simplifies the module dependency graph and improves readability, addressing the flagged code health issue.

Verification:

• Ran the full test suite (bun run test) to confirm tests still pass.
• Verified TypeScript compilation (tsc --noEmit) to guarantee that type safety is retained via inference without resorting to any casting.

Result:
The code is cleaner and the unused import issue is successfully resolved with zero regressions.

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