fix: 内测反馈集中修复（课堂助手/认证/窗口/番茄钟/UI）+ 新手引导

client/electron/windowManager.ts

@@ -163,7 +163,12 @@ export function createMainWindow(
       } else if (savedChoice === 'minimize') {
         win.hide();
       } else {
-        // 无记忆选择，通知前端弹出确认对话框
+        // 无记忆选择，通知前端弹出确认对话框。
+        // 窗口可能处于最小化/隐藏状态（如任务栏右键「关闭窗口」），
+        // 必须先恢复并聚焦，否则应用内对话框用户不可见，表现为“无法关闭”
+        if (win.isMinimized()) win.restore();
+        if (!win.isVisible()) win.show();
+        win.focus();
         win.webContents.send('window:closing');
       }
     } else if (!syncBeforeQuitCompleted) {

client/src/components/layout/AppLayout.tsx

@@ -23,6 +23,7 @@ import { HelpCenter } from '@/components/onboarding/HelpCenter';
 import { useOnboardingStore } from '@/components/onboarding/useOnboardingStore';
 import { useRuntimeEnv } from '@/lib/env/useRuntimeEnv';
 import { PWAInstallPrompt } from '@/components/PWAInstallPrompt';
+import { FirstDiveGate } from '@/features/onboarding/firstDive/FirstDiveGate';
 
 export default function AppLayout() {
   const { pathname } = useLocation();
@@ -164,6 +165,7 @@ export default function AppLayout() {
       <BottomNav />
 
       {/* 全局组件 */}
+      <FirstDiveGate />
       <OnboardingOverlay />
       <ModuleTourToast moduleId={currentModule} />
       <HelpCenter />

client/src/components/layout/Sidebar.tsx

@@ -16,24 +16,26 @@ import { useAuth } from '@/lib/auth/AuthContext';
 import { useTheme } from '@/hooks/useTheme';
 import { SPRING, BEAT } from '@/lib/animation/springConfig';
 import { soundPlayer } from '@/lib/audio/SoundPlayer';
+import { useIsNewbiePhase } from '@/features/onboarding/firstDive/useFirstDiveStore';
 import FeedbackPanel from './FeedbackPanel';
 
 /* ── 导航配置 ── */
+// subtitle：新手期双标签副标题（隐喻名无法自解释，首潜完成前附直白说明）
 const navSection1 = [
   { to: '/', label: '首页', icon: Home, shortcut: '⌘ 1', exact: true },
 ];
 
 const navSection2 = [
-  { to: '/pomodoro', label: '深潜', icon: Timer, shortcut: '⌘ 2', dotColor: 'bg-brand-500' },
-  { to: '/notes', label: '结礁', icon: FileText, shortcut: '⌘ 3', dotColor: 'bg-note' },
-  { to: '/flashcards', label: '反衰减呼吸', icon: Layers, shortcut: '⌘ 4', dotColor: 'bg-flashcard' },
-  { to: '/feynman', label: '浮出水面', icon: Lightbulb, shortcut: '⌘ 5', dotColor: 'bg-feynman' },
+  { to: '/pomodoro', label: '深潜', subtitle: '专注番茄钟', icon: Timer, shortcut: '⌘ 2', dotColor: 'bg-brand-500' },
+  { to: '/notes', label: '结礁', subtitle: '学习笔记', icon: FileText, shortcut: '⌘ 3', dotColor: 'bg-note' },
+  { to: '/flashcards', label: '反衰减呼吸', subtitle: '记忆闪卡', icon: Layers, shortcut: '⌘ 4', dotColor: 'bg-flashcard' },
+  { to: '/feynman', label: '浮出水面', subtitle: '费曼讲解', icon: Lightbulb, shortcut: '⌘ 5', dotColor: 'bg-feynman' },
 ];
 
 const navSection3 = [
   { to: '/analytics', label: '数据分析', icon: BarChart3, shortcut: '⌘ 6' },
-  { to: '/inspiration', label: '萤火海沟', icon: Sparkles, shortcut: '⌘ 6' },
-  { to: '/classroom', label: '回声定位', icon: Clapperboard, shortcut: '⌘ 7', dotColor: 'bg-classroom' },
+  { to: '/inspiration', label: '萤火海沟', subtitle: '灵感收集', icon: Sparkles, shortcut: '⌘ 6' },
+  { to: '/classroom', label: '回声定位', subtitle: '课堂采集', icon: Clapperboard, shortcut: '⌘ 7', dotColor: 'bg-classroom' },
 ];
 
 /* ── 蔡格尼克效应：待继续任务提示池 ── */
@@ -73,6 +75,8 @@ export default function Sidebar() {
   const setCaptureOpen = useCaptureStore((s) => s.setOpen);
   const { user, isAuthenticated } = useAuth();
   const { theme, toggleTheme } = useTheme();
+  // 新手期显示模块副标题（首潜完成后自动隐去）
+  const isNewbie = useIsNewbiePhase();
 
   // TODO: 接入真实学习进度数据
   const _progressItems: { subject: string; progress: number }[] = [];
@@ -194,9 +198,10 @@ export default function Sidebar() {
             </motion.div>
           )}
           {collapsed && <div className="my-1 mx-1.5 border-t border-border/20" />}
-          {navSection2.map(({ to, label, icon: Icon, shortcut, dotColor }, i) => (
+          {navSection2.map(({ to, label, subtitle, icon: Icon, shortcut, dotColor }, i) => (
             <SidebarItem
               key={to} to={to} label={label} icon={Icon}
+              subtitle={isNewbie ? subtitle : undefined}
               shortcut={collapsed ? undefined : shortcut}
               dotColor={dotColor} collapsed={collapsed} index={i + 1}
             />
@@ -209,9 +214,10 @@ export default function Sidebar() {
             </div>
           )}
           {collapsed && <div className="my-1 mx-1.5 border-t border-border/20" />}
-          {navSection3.map(({ to, label, icon: Icon, shortcut, dotColor }, i) => (
+          {navSection3.map(({ to, label, subtitle, icon: Icon, shortcut, dotColor }, i) => (
             <SidebarItem
               key={to} to={to} label={label} icon={Icon}
+              subtitle={isNewbie ? subtitle : undefined}
               shortcut={collapsed ? undefined : shortcut}
               dotColor={dotColor} collapsed={collapsed} index={i + 6}
             />
@@ -316,6 +322,8 @@ export default function Sidebar() {
 interface SidebarItemProps {
   to: string;
   label: string;
+  /** 新手期双标签副标题（如"专注番茄钟"），传入即显示 */
+  subtitle?: string;
   icon: React.ComponentType<{ className?: string; strokeWidth?: string | number }>;
   shortcut?: string;
   dotColor?: string;
@@ -324,7 +332,7 @@ interface SidebarItemProps {
   index?: number;
 }
 
-function SidebarItem({ to, label, icon: Icon, shortcut, dotColor, collapsed, end, index = 0 }: SidebarItemProps) {
+function SidebarItem({ to, label, subtitle, icon: Icon, shortcut, dotColor, collapsed, end, index = 0 }: SidebarItemProps) {
   const location = useLocation();
   // 切换到不同模块时播放导航音效（点击当前已激活项不响）
   const isCurrentActive = end ? location.pathname === to : location.pathname === to || location.pathname.startsWith(to + '/');
@@ -383,6 +391,9 @@ function SidebarItem({ to, label, icon: Icon, shortcut, dotColor, collapsed, end
                 isActive ? 'opacity-100' : 'opacity-60 group-hover:opacity-100',
               )}>
                 {label}
+                {subtitle && (
+                  <span className="ml-1.5 text-[11px] text-text-tertiary/70">· {subtitle}</span>
+                )}
               </span>
             )}
             {/* 快捷键提示 — hover 显示 */}

client/src/components/onboarding/OnboardingOverlay.tsx

@@ -6,6 +6,7 @@
 import { useEffect, useCallback } from 'react';
 import { AnimatePresence } from 'framer-motion';
 import { useOnboardingStore, isGuideDone } from './useOnboardingStore';
+import { loadFirstDiveState } from '@/features/onboarding/firstDive/firstDiveStorage';
 import { Step1Welcome } from './steps/Step1Welcome';
 import { Step2Navigate } from './steps/Step2Navigate';
 import { Step3CameraFlight } from './steps/Step3CameraFlight';
@@ -19,7 +20,10 @@ export function OnboardingOverlay() {
     useOnboardingStore();
 
   // 初始化：检查 localStorage，若未完成则 1.5s 后自动启动
+  // 首潜（L0/L1）未结束时不自动启动，避免双引导叠加轰炸新用户
   useEffect(() => {
+    const diveStage = loadFirstDiveState().stage;
+    if (diveStage === 'landing' || diveStage === 'diving') return;
     if (!isGuideDone()) {
       const timer = setTimeout(() => startGuide(), 1500);
       return () => clearTimeout(timer);

client/src/components/ui/ContextMenu.tsx

@@ -1,7 +1,10 @@
 /**
  * @ai-context: UI 基础组件（shadcn/radix 封装）：ContextMenu。
+ * 定位机制：Radix ContextMenu 的菜单锚点取自触发器真实收到的 contextmenu 事件坐标，
+ * 因此挂载后向隐藏触发器派发携带 position 坐标的原生事件来打开菜单；
+ * 绝不可强制传 open（锚点未初始化会导致菜单固定在屏幕左上角）。
  */
-import React, { useCallback } from 'react';
+import React, { useCallback, useEffect, useRef } from 'react';
 import * as RadixContextMenu from '@radix-ui/react-context-menu';
 import { motion } from 'framer-motion';
 import { cn } from '@/lib/utils';
@@ -120,6 +123,8 @@ export const ContextMenu = <C,>({
   onSelect,
   onClose,
 }: ContextMenuProps<C>) => {
+  const triggerRef = useRef<HTMLSpanElement>(null);
+
   const handleSelect = useCallback(
     (itemKey: string) => {
       onSelect(itemKey, context);
@@ -128,10 +133,24 @@ export const ContextMenu = <C,>({
     [onSelect, context, onClose],
   );
 
+  // 向隐藏触发器派发带坐标的 contextmenu 事件，让 Radix 记录锚点并打开菜单；
+  // position 变化时（菜单未关闭又右键另一目标）重新派发以重定位
+  useEffect(() => {
+    triggerRef.current?.dispatchEvent(new MouseEvent('contextmenu', {
+      bubbles: true,
+      cancelable: true,
+      clientX: position.x,
+      clientY: position.y,
+    }));
+  }, [position.x, position.y]);
+
   return (
-    <RadixContextMenu.Root open onOpenChange={(v) => { if (!v) onClose(); }}>
+    <RadixContextMenu.Root onOpenChange={(v) => { if (!v) onClose(); }}>
       {/* Hidden trigger at target position */}
       <RadixContextMenu.Trigger
+        ref={triggerRef}
+        // 阻止合成事件冒泡到页面的 onContextMenu，避免重复触发 handleContextMenu
+        onContextMenu={(e) => e.stopPropagation()}
         style={{
           position: 'fixed',
           left: position.x,
@@ -147,7 +166,7 @@ export const ContextMenu = <C,>({
 
       <RadixContextMenu.Portal>
         <RadixContextMenu.Content
-          avoidCollisions={false}
+          collisionPadding={8}
           onCloseAutoFocus={(e: Event) => e.preventDefault()}
           className={cn(
             'z-[9999] bg-bg-elevated/90 backdrop-blur-2xl border border-border/50 rounded-kb-md shadow-xl py-1 min-w-[160px]',

client/src/features/onboarding/firstDive/FirstDiveGate.tsx

@@ -0,0 +1,37 @@
+/**
+ * 首潜编排 Gate — 按引导阶段挂载 L0/L1（AppLayout 全局挂载一次）
+ *
+ * @ai-context: bootstrap 负责旧标记迁移、老用户判定与手册种子（幂等）；
+ * stage 为 done/skipped 时本组件渲染 null，对存量用户零打扰。
+ * 最后一步的 praise 需要在 stage 变为 done 后仍短暂展示，故 diving 判断
+ * 额外放行 justCompleted 存在的瞬间。
+ */
+import { useEffect } from 'react';
+import { AnimatePresence } from 'framer-motion';
+import { LandingQuestion } from './LandingQuestion';
+import { FirstDiveGuide } from './FirstDiveGuide';
+import { useFirstDiveStore } from './useFirstDiveStore';
+
+export function FirstDiveGate() {
+  const stage = useFirstDiveStore((s) => s.stage);
+  const isReady = useFirstDiveStore((s) => s.isReady);
+  const justCompleted = useFirstDiveStore((s) => s.justCompleted);
+  const bootstrap = useFirstDiveStore((s) => s.bootstrap);
+
+  useEffect(() => {
+    bootstrap().catch(() => {});
+  }, [bootstrap]);
+
+  if (!isReady) return null;
+
+  const showLanding = stage === 'landing';
+  // done 后放行片刻，让最后一句 praise 说完
+  const showGuide = stage === 'diving' || (stage === 'done' && justCompleted !== null);
+
+  return (
+    <AnimatePresence>
+      {showLanding && <LandingQuestion key="landing" />}
+      {showGuide && <FirstDiveGuide key="guide" />}
+    </AnimatePresence>
+  );
+}