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/views/WorkspaceView.vue

@@ -30,6 +30,7 @@ const messageInput = ref("");
 const messagesEl = ref<HTMLElement | null>(null);
 const inputEl = ref<HTMLTextAreaElement | null>(null);
 const taskPanelRef = ref<InstanceType<typeof WorkspaceTaskPanel> | null>(null);
+const noteEditorRef = ref<InstanceType<typeof WorkspaceNoteEditor> | null>(null);
 const activeNoteId = ref<number | null>(null);
 let workspaceConvId: number | null = null;
 let isNewConv = false;
@@ -78,6 +79,7 @@ watch(
         tc.result?.data?.id
       ) {
         activeNoteId.value = tc.result.data.id as number;
+        noteEditorRef.value?.reload();
       }
       if (
         ["create_task", "update_task", "create_milestone", "update_milestone"].includes(tc.function) &&
@@ -395,6 +397,7 @@ onUnmounted(async () => {
           <div v-if="panelOpen.notes" class="panel-inner">
             <WorkspaceNoteEditor
               v-if="project"
+              ref="noteEditorRef"
               :project-id="project.id"
               :active-note-id="activeNoteId"
             />