whisrs: emit dictation as one batch instead of streaming

Streaming typed every phrase as soon as a 250ms pause came along,
which made long dictations trickle in slowly and double-emitted the
last phrase (once as the phrase, once in the final flush — the source
of the phantom "Thank you."). With phrase_silence_ms at 5s, phrases
only flush at the very end, so the whole text lands in one piece
about 0.1s after the key is released. The 20s force-split still
emits during very long continuous speech, so nothing is lost there.

whisrs/config.toml

@@ -15,4 +15,9 @@ audio_feedback = true
 
 [local-whisper]
 model_path = "/home/jeena/.local/share/whisrs/models/ggml-base.en.bin"
-phrase_silence_ms = 250
+# Batch-like: phrases only flush after 5s of silence, so text lands in one
+# piece right after the key is released (0.1s decode) instead of trickling in
+# while the hold key is still down — injection during a held modifier is
+# unreliable. The 20s force-split still emits during very long continuous
+# speech, so nothing is lost there.
+phrase_silence_ms = 5000