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/workspace/OutlinerBlock.tsx

@@ -125,6 +125,8 @@ export interface OutlinerBlockProps {
   onResolveConflict?: (blockId: string, accept: boolean) => void;
   onUndo?: () => void;
   onRedo?: () => void;
+  /** Part of a selection over several bullets (browsers without the CSS Highlight API tint the row) */
+  inRangeSelection?: boolean;
 }
 
 // Rendered markdown only drops syntax characters (**, `, [..](url) …), so its text is a subsequence of the raw
@@ -175,6 +177,7 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
   onResolveConflict,
   onUndo,
   onRedo,
+  inRangeSelection,
 }) => {
   const [localContent, setLocalContent] = useState<string>(block.content || '');
   const [isLocallyFocused, setIsLocallyFocused] = useState<boolean>(false);
@@ -1077,7 +1080,10 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
 
   return (
     <div
+      data-outline-block={block.id}
       className={`group relative flex items-start gap-1 py-1 px-0.5 sm:px-1.5 rounded-card transition-all duration-300 ${
+        inRangeSelection ? 'bg-accent/15' : ''
+      } ${
         block.type === 'h1'
           ? 'mt-2.5 sm:mt-3'
           : block.type === 'h2'
@@ -1387,7 +1393,7 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
               }`}
             >
               {/* When actively focused, ghost text is invisible so textarea renders text/caret directly */}
-              <span ref={renderedTextRef} className={activeFocus ? 'invisible' : ''}>
+              <span ref={renderedTextRef} data-outline-text className={activeFocus ? 'invisible' : ''}>
                 {previewUrl && !activeFocus ? (
                   // The card above shows the page; the address itself becomes a small link marker
                   <a