Add continuous transcription mode

Algorithm:
* look at last 20 chars of last committed transcription
* scan new transcription using 10-char sliding window
* find spot where distance is minimized
* stitch two messages together

Thus we're able to maintain a continuously growing transcription
without having to feed the AI more than 30 seconds of data at a
time. Seems to work reasonably well in bench tests.

Also fix silence detection. AI exposes a probability that nothing
was said. Hand-pick a probability of 0.1. Sometimes the AI still
goes sicko mode with this setting but going higher occasionally
results in no transcription.

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