feat: 7-61 Yuxi reference — extensions panel, KB detail, manifest split, event router, dashboard

Batch B: settings popover 新增"扩展"tab，按知识库/Skills/MCP/Agent工具分面板
Batch C: knowledge-rag popover 新增"资料源管理/检索测试/检索参数"三tab
Batch A: manifest.rs 按能力域拆为 10 个分组函数（context/doc/knowledge_rag/block/page/mindmap/office/onlyoffice/artifact）
Batch D: 新增 agent-stream-event-router.js 共享模块（事件状态机 + SSE 帧解析）
Batch E: settings popover 新增"仪表盘"tab — 知识库文件数/Skills数量/MCP连接状态/Agent run次数

836/838 Rust 测试通过（仅 2 个预存失败）

rust/crates/mnote-web/browser/sidebar-tree-runtime.js

@@ -219,6 +219,13 @@ import { createSidebarPageSettingsRuntime } from './sidebar-page-settings-runtim
   const ingestSingleKnowledgeRagSource = (...args) => sidebarPageSettings.ingestSingleKnowledgeRagSource(...args);
   const loadKnowledgeRagStatus = (...args) => sidebarPageSettings.loadKnowledgeRagStatus(...args);
   const openKnowledgeRagDashboard = (...args) => sidebarPageSettings.openKnowledgeRagDashboard(...args);
+  const setActiveKnowledgeRagDetailTab = (...args) => sidebarPageSettings.setActiveKnowledgeRagDetailTab(...args);
+  const performKnowledgeRagSearch = (...args) => sidebarPageSettings.performKnowledgeRagSearch(...args);
+  const saveKnowledgeRagSearchParams = (...args) => sidebarPageSettings.saveKnowledgeRagSearchParams(...args);
+  const loadKnowledgeRagSearchParamsToForm = (...args) => sidebarPageSettings.loadKnowledgeRagSearchParamsToForm(...args);
+  const syncKnowledgeRagThresholdDisplay = (...args) => sidebarPageSettings.syncKnowledgeRagThresholdDisplay(...args);
+  const refreshDashboardPanel = (...args) => sidebarPageSettings.refreshDashboardPanel(...args);
+
   const pruneKnowledgeRagRegistry = (...args) => sidebarPageSettings.pruneKnowledgeRagRegistry(...args);
   const setKnowledgeRagSourceFilter = (...args) => sidebarPageSettings.setKnowledgeRagSourceFilter(...args);
   const useKnowledgeRagFileTreeSelection = (...args) => sidebarPageSettings.useKnowledgeRagFileTreeSelection(...args);
@@ -2999,6 +3006,14 @@ import { createSidebarPageSettingsRuntime } from './sidebar-page-settings-runtim
       e.preventDefault();
       setActivePageSettingsTab(pageSettingsTab.getAttribute('data-page-settings-tab') || 'page');
       return;
+
+    var extensionsSubtab = closestAction(e.target, '[data-extensions-subtab]');
+    if (extensionsSubtab) {
+      e.preventDefault();
+      setActiveExtensionsSubtab(extensionsSubtab.getAttribute('data-extensions-subtab') || 'knowledge');
+      return;
+    }
+
     }
 
     var localIndexAction = closestAction(e.target, '[data-local-index-action]');
@@ -3027,6 +3042,15 @@ import { createSidebarPageSettingsRuntime } from './sidebar-page-settings-runtim
     if (knowledgeRagAction) {
       e.preventDefault();
       var knowledgeRagActionName = knowledgeRagAction.getAttribute('data-knowledge-rag-action') || '';
+      if (knowledgeRagActionName === 'manage') {
+        void openKnowledgeRagSettingsPopover();
+        return;
+      }
+      if (knowledgeRagActionName === 'refresh-status') {
+        void refreshKnowledgeExtensionsPanel();
+        return;
+      }
+
       if (knowledgeRagActionName === 'refresh') {
         void loadKnowledgeRagStatus(true);
         return;
@@ -3069,6 +3093,51 @@ import { createSidebarPageSettingsRuntime } from './sidebar-page-settings-runtim
       }
     }
 
+
+    var kbRagDetailTab = closestAction(e.target, '[data-kb-rag-tab]');
+    if (kbRagDetailTab) {
+      e.preventDefault();
+      var tabName = kbRagDetailTab.getAttribute('data-kb-rag-tab') || 'sources';
+      setActiveKnowledgeRagDetailTab(tabName);
+      if (tabName === 'params') loadKnowledgeRagSearchParamsToForm();
+      return;
+    }
+
+    var kbRagAction = closestAction(e.target, '[data-kb-rag-action]');
+    if (kbRagAction) {
+      e.preventDefault();
+      var kbRagActionName = kbRagAction.getAttribute('data-kb-rag-action') || '';
+      if (kbRagActionName === 'search') {
+        void performKnowledgeRagSearch();
+        return;
+      }
+      if (kbRagActionName === 'save-params') {
+        saveKnowledgeRagSearchParams();
+        return;
+      }
+    }
+
+    var kbRagSearchInput = closestAction(e.target, '[data-kb-rag-search-input]');
+    if (kbRagSearchInput && e.key === 'Enter') {
+      e.preventDefault();
+      void performKnowledgeRagSearch();
+      return;
+    }
+
+    var kbRagThresholdRange = closestAction(e.target, '[data-kb-rag-param="similarity_threshold"]');
+    if (kbRagThresholdRange && e.type === 'input') {
+      syncKnowledgeRagThresholdDisplay();
+      return;
+    }
+
+
+    var dashboardAction = closestAction(e.target, '[data-dashboard-action="refresh"]');
+    if (dashboardAction) {
+      e.preventDefault();
+      refreshDashboardPanel();
+      return;
+    }
+
     var pageSettingsAction = closestAction(e.target, '[data-page-settings-action]');
     if (pageSettingsAction) {
       e.preventDefault();