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>

frontend/src/features/triage/TaskDetailModal.tsx

@@ -507,7 +507,7 @@ const TaskDetailModalContent: React.FC<TaskDetailModalProps & { task: Thought }>
                   aria-label="Fälligkeitsdatum"
                   value={dueParts.date}
                   onChange={(e) => onUpdateDueDate(task, joinDue(e.target.value, dueParts.time))}
-                  className="flex-1 min-w-0 h-11 sm:h-8 input-field px-2 text-base sm:text-xs bg-panel"
+                  className="flex-1 min-w-0 h-11 sm:h-8 input-field px-2 lg:px-1.5 text-base sm:text-xs bg-panel"
                 />
                 <input
                   type="time"
@@ -516,7 +516,7 @@ const TaskDetailModalContent: React.FC<TaskDetailModalProps & { task: Thought }>
                   value={dueParts.time}
                   disabled={!dueParts.date}
                   onChange={(e) => onUpdateDueDate(task, joinDue(dueParts.date, e.target.value))}
-                  className="w-[7.5rem] shrink-0 h-11 sm:h-8 input-field px-2 text-base sm:text-xs bg-panel disabled:opacity-50"
+                  className="w-[7.5rem] lg:w-[5.25rem] shrink-0 h-11 sm:h-8 input-field px-2 lg:px-1.5 text-base sm:text-xs bg-panel disabled:opacity-50"
                 />
                 {task.dueDate && (
                   <button