feat(workspace): numbered lists and reliable markdown paste

- block type 'numbered' (/number): 1., a., i. by nesting, continues on
  Enter, an empty item ends the list; markdown export/import as 1.
- pasting: parser moved to lib/pasteOutline with tests; blank lines split
  paragraphs, numbered lists keep their type, indentation levels follow
  the widths in use (2, 3 or 4 spaces, tabs)
- text that stays in the focused block after pasting (a paragraph with
  line breaks) was dropped; the block now takes it

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

frontend/src/features/workspace/OutlinerBlock.tsx

@@ -12,6 +12,7 @@ import {
   Heading2,
   Heading3,
   ListTodo,
+  ListOrdered,
   Minus,
   MessageSquare,
   ExternalLink,
@@ -54,6 +55,7 @@ export interface SlashCommand {
 
 const SLASH_COMMANDS: SlashCommand[] = [
   { type: 'todo', label: '/todo', desc: 'Aufgabe mit Checkbox', icon: <ListTodo className="w-3.5 h-3.5" /> },
+  { type: 'numbered', label: '/number', desc: 'Nummerierte Liste (1., a., i.)', icon: <ListOrdered className="w-3.5 h-3.5" />, aliases: ['nummer', 'liste', 'ol'] },
   { type: 'link', label: '/link', desc: 'Notiz oder Weblink', icon: <LinkIcon className="w-3.5 h-3.5" /> },
   { type: 'h1', label: '/h1', desc: 'Große Überschrift', icon: <Heading1 className="w-3.5 h-3.5" /> },
   { type: 'h2', label: '/h2', desc: 'Abschnitts-Überschrift', icon: <Heading2 className="w-3.5 h-3.5" /> },
@@ -98,6 +100,8 @@ export interface OutlinerBlockProps {
   isTargeted?: boolean;
   registerTextareaRef: (blockId: string, el: HTMLTextAreaElement | null) => void;
   onPasteMultiLines?: (blockId: string, textBefore: string, textAfter: string, rawLines: string[]) => void;
+  /** Number or letter of a numbered-list item ("1.", "b.", "iii.") */
+  listMarker?: string;
   lockedBy?: string; // someone else is editing this block
   canAppendBelow?: boolean; // the user may edit the note, so Enter in a locked block still adds one below
   onResolveConflict?: (blockId: string, accept: boolean) => void;
@@ -145,6 +149,7 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
   isTargeted,
   registerTextareaRef,
   onPasteMultiLines,
+  listMarker,
   lockedBy,
   canAppendBelow,
   onResolveConflict,
@@ -600,6 +605,8 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
     }
 
     isPastingRef.current = true;
+    // Pasted text that stays in this block arrives as a prop change while the field has focus: take it
+    acceptRemoteUntilRef.current = Date.now() + 1000;
     onPasteMultiLinesRef.current?.(block.id, textBefore, textAfter, rawLines);
   };
 
@@ -813,6 +820,11 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
           onIndentBlockRef.current(block.id, -1);
           return;
         }
+        // Enter in an empty numbered item at the top ends the list
+        if (block.type === 'numbered') {
+          flushDebounce('', { type: 'text' });
+          return;
+        }
       }
 
       const start = e.currentTarget.selectionStart ?? localContent.length;
@@ -970,7 +982,9 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
           draggable={canEdit}
           onDragStart={() => canEdit && onDragStartBlock?.(index)}
           onClick={() => onZoomBlock?.(block.id)}
-          className={`w-4 h-4 flex items-center justify-center rounded-btn group/bullet transition-transform ${
+          className={`${
+            block.type === 'numbered' && listMarker ? 'w-4 h-4 justify-end overflow-visible' : 'w-4 h-4 justify-center'
+          } flex items-center rounded-btn group/bullet transition-transform ${
             canEdit ? 'cursor-grab active:cursor-grabbing' : 'cursor-pointer'
           }`}
           title={
@@ -979,6 +993,15 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
               : 'Klick: In diesen Ast hineinzoomen (Fokus-Modus)'
           }
         >
+          {block.type === 'numbered' && listMarker ? (
+            <span
+              className={`text-xs tabular-nums font-medium leading-none whitespace-nowrap transition-colors ${
+                activeFocus ? 'text-main' : 'text-muted group-hover/bullet:text-accent'
+              }`}
+            >
+              {listMarker}
+            </span>
+          ) : (
           <span
             className={`w-1.5 h-1.5 rounded-full transition-all duration-150 ${
               block.collapsed && hasChildren
@@ -992,6 +1015,7 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
                 : 'opacity-100'
             }`}
           />
+          )}
         </button>
 
         {/* If To-Do block: checkbox alongside bullet */}