feat(workspace): bring an extracted note back into the bullet

A bullet that is only a link to a note (as left by /extract) gets a
"Notiz zurückholen" button. POST /documents/{id}/inline returns the
linked note's blocks with fresh ids and trashes the note; the editor
puts the title back as text and inserts the blocks as an own edit, so
Strg+Z restores the link and the note. Only own notes that no other
note links to. Release 0.52.0.

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

frontend/src/features/workspace/OutlinerBlock.tsx

@@ -24,6 +24,7 @@ import {
   Mic,
   AudioLines,
   FileOutput,
+  FileInput,
   Link2,
   Type,
 } from 'lucide-react';
@@ -96,6 +97,7 @@ export interface OutlinerBlockProps {
   onZoomBlock?: (blockId: string) => void;
   /** Turns this bullet and its children into a note of its own */
   onExtractBlock?: (blockId: string) => void;
+  onInlineBlock?: (blockId: string) => void;
   onUpdateBlock: (updated: DocumentBlock, immediate?: boolean) => void;
   onCreateBlockBelow: (afterBlockId: string, newContent?: string) => void;
   onDeleteBlock: (blockId: string, deleteSubtree?: boolean) => void;
@@ -151,6 +153,7 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
   levelOffset = 0,
   onZoomBlock,
   onExtractBlock,
+  onInlineBlock,
   onUpdateBlock,
   onCreateBlockBelow,
   onDeleteBlock,
@@ -1724,6 +1727,19 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
           </button>
         )}
 
+        {/* The way back: a bullet that only links to a note gets that note's bullets again */}
+        {canEdit && onInlineBlock && isNoteLinkOnly(localContent) && !mediaPicker && (
+          <button
+            type="button"
+            onClick={() => onInlineBlock(block.id)}
+            className="p-1 sm:p-0.5 min-w-[28px] min-h-[28px] sm:min-w-0 sm:min-h-0 flex items-center justify-center text-faint hover:text-accent rounded-btn transition-colors cursor-pointer"
+            title="Notiz zurückholen (ihre Punkte kommen wieder hierher, die Notiz in den Papierkorb)"
+            aria-label="Notiz zurückholen"
+          >
+            <FileInput className="w-3.5 h-3.5" />
+          </button>
+        )}
+
         {/* Zoom / Focus button */}
         {onZoomBlock && (
           <button