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/lists/SharedListsView.tsx

@@ -825,14 +825,15 @@ export const SharedListsView: React.FC<SharedListsViewProps> = ({ onRefreshGloba
             const openCount = deduplicateItems(lst.items || []).filter((i) => !i.isCompleted).length;
             const isSelected = activeList?.id === lst.id;
             return (
-              <div key={lst.id} className="relative group flex items-center">
+              <div
+                key={lst.id}
+                className={`relative group h-8 flex items-center border rounded-btn transition-colors ${
+                  isSelected ? 'bg-panel border-accent text-main' : 'bg-canvas border-border text-muted hover:text-main'
+                } ${isSelected && lists.length > 1 ? 'pr-1' : ''}`}
+              >
                 <button
                   onClick={() => setActiveListId(lst.id)}
-                  className={`h-8 px-3 text-xs font-medium border flex items-center gap-1.5 transition-colors ${
-                    isSelected
-                      ? 'bg-panel border-accent text-main'
-                      : 'bg-canvas border-border text-muted hover:text-main'
-                  } ${isSelected && lists.length > 1 ? 'rounded-l-btn rounded-r-none border-r-0' : 'rounded-btn'}`}
+                  className="h-full px-3 text-xs font-medium flex items-center gap-1.5 rounded-btn"
                 >
                   <span>{lst.icon}</span>
                   <span>{lst.title}</span>
@@ -844,7 +845,7 @@ export const SharedListsView: React.FC<SharedListsViewProps> = ({ onRefreshGloba
                   <button
                     onClick={() => handleDeleteList(lst.id)}
                     title="Liste löschen"
-                    className="h-8 px-2 bg-panel border-y border-r border-accent text-faint hover:text-status-err hover:bg-status-err/10 rounded-r-btn flex items-center justify-center transition-colors cursor-pointer"
+                    className="h-6 w-6 text-faint hover:text-status-err hover:bg-status-err/10 rounded-btn flex items-center justify-center transition-colors cursor-pointer"
                   >
                     <X className="w-3 h-3" />
                   </button>