fix(workspace): ignore formatting shortcuts in read-only notes

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

frontend/src/features/workspace/OutlinerBlock.tsx

@@ -645,7 +645,7 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
 
     // Formatting shortcuts (Ctrl/Cmd+B, Ctrl/Cmd+I, Ctrl/Cmd+K) - not in code blocks
     const isMod = (e.ctrlKey || e.metaKey) && !e.altKey;
-    if (isMod && block.type !== 'code' && ['b', 'i', 'k'].includes(e.key.toLowerCase())) {
+    if (isMod && canEdit && block.type !== 'code' && ['b', 'i', 'k'].includes(e.key.toLowerCase())) {
       e.preventDefault();
       e.stopPropagation();