fix: deepen opens the linked note, task list columns in "Alle Aufgaben", Whisper repeats, date field

- The deepen buttons of task rows and Kanban cards open an already linked note (accent colour)
  instead of creating another one; the server refuses a second note for a linked task as well.
- "Alle Aufgaben" uses each task's own list columns for the status selector, dot and detail.
- Whisper: send vad_filter (STT_VAD_FILTER, default on) and drop a verbatim repeated tail of
  sentences or words from the transcript.
- Task detail: narrower time field, wider date field in the desktop sidebar.

v0.37.2.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-compose.yml

@@ -61,6 +61,7 @@ services:
       - STT_MAX_PARALLEL=${STT_MAX_PARALLEL:-1}
       - STT_PER_USER_PER_HOUR=${STT_PER_USER_PER_HOUR:-60}
       - STT_TIMEOUT_SECONDS=${STT_TIMEOUT_SECONDS:-120}
+      - STT_VAD_FILTER=${STT_VAD_FILTER:-true}
 
   # Optional: eigene Spracherkennung (Whisper). Zum Einschalten:
   #   1. die Rauten vor dem Block "whisper" unten entfernen