feat: live card refresh, list checkboxes, minichat width cap

KnowledgeView:
- Watch streamingToolCalls; call fetchItems+fetchTags on create/update
  note or task so the card grid reflects changes made via the minichat
- Cap minichat to max-width: var(--page-max-width) so it matches chat column width

WorkspaceView + WorkspaceNoteEditor:
- Expose reload() from WorkspaceNoteEditor via defineExpose
- Call noteEditorRef.reload() alongside taskPanelRef.reload() when
  create_note/update_note tools succeed in the SSE watcher

KnowledgeView list cards:
- Backend: parse markdown task list into list_items [{text, checked}] + body
- Card renders up to 6 items with real checkboxes; toggleListItem()
  does an optimistic update then PATCHes /api/notes/:id
- Progress bar kept below items; "+N more" shown when list is long

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/WorkspaceNoteEditor.vue

@@ -293,6 +293,8 @@ onMounted(async () => {
 });
 
 onUnmounted(() => { if (linkCheckTimer) clearTimeout(linkCheckTimer); });
+
+defineExpose({ reload: loadProjectNotes });
 </script>
 
 <template>