fix: mobile layout, task clicks, list tab corners, hashtags in URLs

Mobile
- Plus button in triage did nothing: the stored action returned the
  capture function instead of calling it
- Workspace: tabs share the full width; save status sits as an icon next
  to the note title instead of wrapping into its own row; "Neue Notiz" /
  "Neuer Ordner" only in the top menu (and +), not repeated in the list
- Outliner fields measured while hidden stayed one line high (cut-off
  callout); they are measured again when their width changes
- Task dialog: scrolls in a div instead of a fieldset, height in dvh,
  notes editor grows with its text, so long notes are fully reachable

Desktop
- Delete button of the selected task/shopping list sits inside the tab as
  its own rounded button (matches rounded themes like Soft)

Both
- Tasks sometimes did not open: every reload after an action replaced the
  list with a loading placeholder, swallowing clicks; reloads are now
  silent after the first load of a list, stale responses are dropped
- Hashtags need whitespace or "(" before "#", so URL anchors are no
  longer tags (server, browser); one-time cleanup of stored anchor tags

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

frontend/src/features/workspace/OutlinerBlock.tsx

@@ -288,8 +288,25 @@ export const OutlinerBlock: React.FC<OutlinerBlockProps> = ({
 
   useEffect(() => {
     window.addEventListener('resize', adjustHeight);
-    return () => window.removeEventListener('resize', adjustHeight);
-  }, [adjustHeight]);
+    // The field can be measured while hidden (phone layout shows the editor only after selecting a note);
+    // measure again whenever its width changes
+    const el = textareaRef.current;
+    let lastWidth = el?.clientWidth ?? 0;
+    const observer =
+      el && typeof ResizeObserver !== 'undefined'
+        ? new ResizeObserver(() => {
+            if (el.clientWidth !== lastWidth) {
+              lastWidth = el.clientWidth;
+              adjustHeight();
+            }
+          })
+        : null;
+    if (el) observer?.observe(el);
+    return () => {
+      window.removeEventListener('resize', adjustHeight);
+      observer?.disconnect();
+    };
+  }, [adjustHeight, block.type]);
 
   const filteredSlashCommands = useMemo(() => {
     if (slashSearch === null) return [];