fix: 修复专家发现与前端选择多项问题

后端：
- split_frontmatter 兼容 CRLF/LF 行尾符，修复 Windows 下 EXPERT.md 解析失败
- Config::load_from 移除 fallback 到 cwd/config.json 的逻辑，避免静默加载项目目录配置导致 experts 字段缺失
- ExpertRuntime 新增 update_config 方法，save_config 时同步更新 ExpertRuntime 内部 config，sources 变更即时生效
- source_order 空数组不再兜底返回 [User, Project]，尊重用户关闭所有源的意图
- from_config_with_cwd 增加诊断日志，输出 enabled/sources/cwd/discovered

前端：
- ExpertSelector 弹窗改为按钮上方居中展开
- 专家卡片 name 完整显示（break-all），路径显示在卡片底部
- "管理专家"入口仅在无专家时显示
- 每次打开下拉都重新拉取列表和选中状态
- 监听设置弹窗关闭事件刷新已选专家（处理已选专家被禁用的情况）

src/experts/mod.rs

@@ -256,6 +256,14 @@ impl ExpertRuntime {
         // session selections are persisted in the project-scope state file
         let session_experts = load_project_session_experts(&cwd);
 
+        tracing::info!(
+            enabled = config.enabled,
+            sources = ?config.sources,
+            cwd = %cwd.display(),
+            discovered = catalog.len(),
+            "ExpertRuntime initialized"
+        );
+
         Self {
             config: RwLock::new(config),
             catalog: RwLock::new(catalog),
@@ -816,12 +824,23 @@ fn parse_expert_file(path: &Path, source: ExpertSource) -> Result<Expert, String
 }
 
 fn split_frontmatter(content: &str) -> Option<(&str, &str)> {
-    let rest = content.strip_prefix("---\n")?;
+    // 兼容 CRLF（Windows）和 LF（Unix）行尾符
+    let rest = content
+        .strip_prefix("---\n")
+        .or_else(|| content.strip_prefix("---\r\n"))?;
     let marker = "\n---\n";
-    let idx = rest.find(marker)?;
+    let marker_crlf = "\n---\r\n";
+    if let Some(idx) = rest.find(marker) {
         let frontmatter = &rest[..idx];
         let body = &rest[idx + marker.len()..];
         Some((frontmatter, body))
+    } else if let Some(idx) = rest.find(marker_crlf) {
+        let frontmatter = &rest[..idx];
+        let body = &rest[idx + marker_crlf.len()..];
+        Some((frontmatter, body))
+    } else {
+        None
+    }
 }
 
 // ========== State file I/O ==========

web/src/App.tsx

@@ -167,6 +167,8 @@ function App() {
 
   const [configPageOpen, setConfigPageOpen] = useState(false)
   const [configInitialTab, setConfigInitialTab] = useState<'providers' | 'experts'>('providers')
+  // 设置弹窗关闭计数器：每次关闭时递增，用于通知 ExpertSelector 刷新已选专家状态
+  const [settingsClosedTick, setSettingsClosedTick] = useState(0)
 
   const handleSaveConnection = useCallback((host: string, port: number) => {
     setGatewaySettings({ host, port })
@@ -806,6 +808,7 @@ function App() {
               viewKey={viewKey}
               highlightedMessageId={highlightedMessageId}
               sessionId={sessionId}
+              settingsClosedTick={settingsClosedTick}
               onOpenSettings={() => {
                 setConfigInitialTab('experts')
                 setConfigPageOpen(true)
@@ -899,7 +902,10 @@ function App() {
       {/* 系统配置页面 */}
       {configPageOpen && (
         <ConfigPage
-          onClose={() => setConfigPageOpen(false)}
+          onClose={() => {
+            setConfigPageOpen(false)
+            setSettingsClosedTick(t => t + 1)
+          }}
           onSaveConnection={handleSaveConnection}
           initialTab={configInitialTab}
         />

web/src/components/Chat/ChatContainer.tsx

@@ -21,6 +21,8 @@ interface ChatContainerProps {
   sessionId?: string | null
   /** 打开设置页（用于专家管理入口） */
   onOpenSettings?: () => void
+  /** 设置弹窗关闭信号（每次关闭递增，用于触发 ExpertSelector 刷新） */
+  settingsClosedTick?: number
 }
 
 export function ChatContainer({
@@ -36,6 +38,7 @@ export function ChatContainer({
   highlightedMessageId,
   sessionId,
   onOpenSettings,
+  settingsClosedTick,
 }: ChatContainerProps) {
   const [selectedExpert, setSelectedExpert] = useState<{ name: string; description: string } | null>(null)
 
@@ -48,6 +51,7 @@ export function ChatContainer({
         sessionId={sessionId ?? null}
         onManageExperts={onOpenSettings}
         onSelectionChange={setSelectedExpert}
+        settingsClosedTick={settingsClosedTick}
       />
       <MessageInput
         onSend={onSendMessage}

web/src/components/Chat/ExpertSelector.tsx

@@ -20,9 +20,11 @@ interface ExpertSelectorProps {
   sessionId: string | null
   onManageExperts?: () => void
   onSelectionChange?: (expert: SelectedExpert | null) => void
+  /** 设置弹窗关闭时触发的刷新信号（每次关闭时递增） */
+  settingsClosedTick?: number
 }
 
-export function ExpertSelector({ sessionId, onManageExperts, onSelectionChange }: ExpertSelectorProps) {
+export function ExpertSelector({ sessionId, onManageExperts, onSelectionChange, settingsClosedTick }: ExpertSelectorProps) {
   const [selectedExpert, setSelectedExpert] = useState<SelectedExpert | null>(null)
   const [expertList, setExpertList] = useState<ExpertItem[]>([])
   const [open, setOpen] = useState(false)
@@ -31,41 +33,46 @@ export function ExpertSelector({ sessionId, onManageExperts, onSelectionChange }
   const [error, setError] = useState<string | null>(null)
 
   const containerRef = useRef<HTMLDivElement>(null)
-  const listFetchedRef = useRef(false)
 
-  // Load current selection whenever sessionId changes
+  // 刷新当前会话选中的专家（后端会对禁用专家返回 null）
-  useEffect(() => {
+  const refreshSelection = useCallback(() => {
     if (!sessionId) {
       setSelectedExpert(null)
       onSelectionChange?.(null)
       return
     }
-    let cancelled = false
     setLoading(true)
     setError(null)
     getSelectedExpert(sessionId)
       .then(data => {
-        if (cancelled) return
         if (data?.expert) {
           setSelectedExpert({ name: data.expert.name, description: data.expert.description })
           onSelectionChange?.({ name: data.expert.name, description: data.expert.description })
         } else {
+          // 已选专家被禁用/删除时，后端返回 null，前端同步清除
           setSelectedExpert(null)
           onSelectionChange?.(null)
         }
       })
       .catch(() => {
-        if (cancelled) return
         // Silent fail: default to no expert
         setSelectedExpert(null)
         onSelectionChange?.(null)
       })
-      .finally(() => {
+      .finally(() => setLoading(false))
-        if (!cancelled) setLoading(false)
+  }, [sessionId, onSelectionChange])
-      })
+
-    return () => { cancelled = true }
+  // Load current selection whenever sessionId changes
+  useEffect(() => {
+    refreshSelection()
+  }, [refreshSelection])
+
+  // 设置弹窗关闭时刷新选中状态（处理已选专家被禁用/删除的情况）
+  useEffect(() => {
+    if (settingsClosedTick === undefined) return
+    refreshSelection()
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [sessionId])
+  }, [settingsClosedTick])
 
   // Click outside to close dropdown
   useEffect(() => {
@@ -95,9 +102,10 @@ export function ExpertSelector({ sessionId, onManageExperts, onSelectionChange }
   const handleToggleOpen = () => {
     const next = !open
     setOpen(next)
-    if (next && !listFetchedRef.current) {
+    // 每次打开都重新拉取列表和选中状态，确保设置页面的启用/禁用变更能及时反映
-      listFetchedRef.current = true
+    if (next) {
       fetchExpertList()
+      refreshSelection()
     }
   }
 
@@ -136,6 +144,7 @@ export function ExpertSelector({ sessionId, onManageExperts, onSelectionChange }
   return (
     <div ref={containerRef} className="relative shrink-0 px-4 pt-2 pb-0">
       <div className="max-w-5xl mx-auto flex items-center gap-2">
+        <div className="relative">
           <button
             onClick={handleToggleOpen}
             disabled={loading}
@@ -165,15 +174,10 @@ export function ExpertSelector({ sessionId, onManageExperts, onSelectionChange }
               className={`h-3 w-3 text-[var(--text-muted)] transition-transform ${open ? 'rotate-180' : ''}`}
             />
           </button>
-        {error && (
-          <span className="text-xs text-red-400 truncate">{error}</span>
-        )}
-      </div>
 
           {open && (
             <div
-          className="absolute z-30 mt-1 w-72 max-w-[90vw] rounded-xl border border-[var(--border-color)] bg-[var(--bg-secondary)] shadow-2xl backdrop-blur-md overflow-hidden"
+              className="absolute z-30 bottom-full mb-1 left-1/2 -translate-x-1/2 w-72 max-w-[90vw] rounded-xl border border-[var(--border-color)] bg-[var(--bg-secondary)] shadow-2xl backdrop-blur-md overflow-hidden"
-          style={{ left: 'max(1rem, calc(50% - 18rem))' }}
             >
               {listLoading && expertList.length === 0 ? (
                 <div className="flex items-center gap-2 px-3 py-3 text-xs text-[var(--text-muted)]">
@@ -192,7 +196,7 @@ export function ExpertSelector({ sessionId, onManageExperts, onSelectionChange }
                       <Check className="h-3.5 w-3.5 text-[var(--accent-cyan)] ml-auto" />
                     )}
                   </button>
-              {expertList.length > 0 && (
+                  {expertList.length > 0 ? (
                     <div className="border-t border-[var(--border-color)]">
                       {expertList.map(expert => {
                         const isSelected = selectedExpert?.name === expert.name
@@ -206,26 +210,31 @@ export function ExpertSelector({ sessionId, onManageExperts, onSelectionChange }
                               className={`h-4 w-4 shrink-0 mt-0.5 ${isSelected ? 'text-[var(--accent-cyan)]' : 'text-[var(--text-muted)]'}`}
                             />
                             <div className="min-w-0 flex-1">
-                          <div className="flex items-center gap-1.5">
+                              <div className="flex items-start gap-1.5">
-                            <span className="text-sm font-medium text-[var(--text-primary)] truncate">
+                                <span className="text-sm font-medium text-[var(--text-primary)] break-all">
                                   {expert.name}
                                 </span>
-                            <span className="text-[9px] px-1 py-0.5 rounded bg-[var(--bg-tertiary)] text-[var(--text-muted)] uppercase tracking-wider shrink-0">
-                              {expert.source}
-                            </span>
                                 {isSelected && (
-                              <Check className="h-3.5 w-3.5 text-[var(--accent-cyan)] ml-auto shrink-0" />
+                                  <Check className="h-3.5 w-3.5 text-[var(--accent-cyan)] ml-auto shrink-0 mt-0.5" />
                                 )}
                               </div>
-                          <p className="text-xs text-[var(--text-muted)] truncate mt-0.5">
+                              <p className="text-xs text-[var(--text-muted)] mt-0.5">
                                 {expert.description}
                               </p>
+                              {expert.path && (
+                                <p
+                                  className="text-[10px] text-[var(--text-muted)]/60 truncate mt-1 font-mono"
+                                  title={expert.path}
+                                >
+                                  {expert.path}
+                                </p>
+                              )}
                             </div>
                           </button>
                         )
                       })}
                     </div>
-              )}
+                  ) : (
                     <div className="border-t border-[var(--border-color)]">
                       <button
                         onClick={handleManage}
@@ -235,10 +244,16 @@ export function ExpertSelector({ sessionId, onManageExperts, onSelectionChange }
                         <span>管理专家...</span>
                       </button>
                     </div>
+                  )}
                 </>
               )}
             </div>
           )}
         </div>
+        {error && (
+          <span className="text-xs text-red-400 truncate">{error}</span>
+        )}
+      </div>
+    </div>
   )
 }