feat: select text across bullets and delete it like a text editor; Ctrl+Z in tasks; notes and lists without emoji; custom done columns complete tasks

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

frontend/src/features/triage/TaskDetailModal.tsx

@@ -606,7 +606,7 @@ const TaskDetailModalContent: React.FC<TaskDetailModalProps & { task: Thought }>
                 <option value="">-- Keine Liste (Allgemein) --</option>
                 {taskLists.map((tl) => (
                   <option key={tl.id} value={tl.id}>
-                    {tl.icon} {tl.title}
+                    {[tl.icon, tl.title].filter(Boolean).join(' ')}
                   </option>
                 ))}
               </select>