feat: wire custom vocabulary from settings into keyword boosting

[devin-ai-integration]

feat: wire custom vocabulary from settings into keyword boosting

Summary

Previously, useKeywords only extracted keywords from the note's markdown (hashtags + NLP). Custom vocabulary items added in Settings > Memory were stored but never sent to STT providers for keyword boosting.

This wires the visibleVocabs query (memories table, type="vocab") into the useKeywords hook so custom vocab entries are included in the keywords array passed to both streaming and batch transcription.

Custom vocab items are prepended so they survive deduplication in combineKeywords.

Review & Testing Checklist for Human

• Verify that adding a custom vocab term in Settings > Memory > Custom Vocabulary causes it to appear in the keywords sent during a live transcription session (check websocket params or logs)
• Verify that removing a custom vocab term stops it from being boosted in subsequent transcriptions
• Confirm no excessive re-renders — vocabTable is a full table subscription, but vocab changes are infrequent so this should be fine in practice

Notes

• Also documented the team's custom vocabulary discussion on #3512
• STT providers typically cap keyword boosting at ~100 words. There's no client-side limit on custom vocab count — worth considering if users add large vocabularies (pre-existing concern, not introduced here).
• Link to Devin run
• Requested by @ComputelessComputer

[devin-ai-integration]

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