feat: task trash, triage trash and retention settings for every area; admin can forbid keeping things for good

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

frontend/src/features/triage/TriageDeck.tsx

@@ -20,6 +20,7 @@ import {
   ArrowLeft,
   ArrowRight,
   ChevronDown,
+  Trash2,
 } from 'lucide-react';
 import { SharedList, Thought } from '../../lib/types';
 import { addDays, formatDue } from '../../lib/due';
@@ -32,6 +33,9 @@ interface TriageDeckProps {
   onDeckChange: () => void;
   onOpenDocument: (docId: string) => void;
   onFocusCapture: () => void;
+  // The triage's own trash (TriageTrash): thoughts thrown away while sorting
+  discardedCount: number;
+  onOpenTrash: () => void;
 }
 
 interface SwipeableQueueItemProps {
@@ -219,6 +223,8 @@ export const TriageDeck: React.FC<TriageDeckProps> = ({
   lists,
   onDeckChange,
   onFocusCapture,
+  discardedCount,
+  onOpenTrash,
 }) => {
   const writableLists = lists.filter((l) => l.isOwner || l.role !== 'viewer');
   const singleWritableList = writableLists.length === 1 ? writableLists[0] : null;
@@ -469,6 +475,13 @@ export const TriageDeck: React.FC<TriageDeckProps> = ({
               Letzte Aktion rückgängig
             </button>
           )}
+
+          {discardedCount > 0 && (
+            <button onClick={onOpenTrash} className="btn-action h-10 px-4 text-sm">
+              <Trash2 className="w-4 h-4" />
+              Papierkorb ({discardedCount})
+            </button>
+          )}
         </div>
       </div>
     );
@@ -488,15 +501,24 @@ export const TriageDeck: React.FC<TriageDeckProps> = ({
           </span>
         </div>
 
-        {lastTriaged && (
-          <button
-            onClick={handleUndo}
-            className="btn-action h-8 px-3 text-xs"
-          >
-            <RotateCcw className="w-3.5 h-3.5 text-accent" />
-            Rückgängig
-          </button>
-        )}
+        <div className="flex items-center gap-2">
+          {lastTriaged && (
+            <button
+              onClick={handleUndo}
+              className="btn-action h-8 px-3 text-xs"
+            >
+              <RotateCcw className="w-3.5 h-3.5 text-accent" />
+              Rückgängig
+            </button>
+          )}
+          {/* Phones reach the trash through the menu */}
+          {discardedCount > 0 && (
+            <button onClick={onOpenTrash} className="hidden sm:inline-flex btn-action h-8 px-3 text-xs" title="Papierkorb der Triage">
+              <Trash2 className="w-3.5 h-3.5" />
+              {discardedCount}
+            </button>
+          )}
+        </div>
       </div>
 
       {/* Card Stack Container */}