产品体验修复：P0 阻塞 + P1/P2 改善（产品审查 14 项中修复 10 项）

P0 阻塞：
- Pro 加载不再阻塞整个看板：只显示精简顶栏 + 加载状态，不再遮盖整个页面
- Scan 失败加重试按钮：所有用户（含免费）均可手动重试
- Detail Panel 同步超时后显示提示："同步时间较长，当前展示的数据可能不完整"

P1 体验：
- 登录页增加"忘记密码"链接：调用 Supabase 密码重置流程
- 登录失败/邮箱未验证增加明确提示："如刚注册，请先点击验证链接"
- 公告横幅增加 ✕ 关闭按钮：点击后永久隐藏

P2 改善：
- entitlement-required 页面重设计：品牌化、增加返回首页和登录按钮
- 订阅帮助页中英双语：所有 FAQ 和 UI 文案支持中英文切换
- 新增产品审查文档 docs/product-review-jun-2026.md

Tested: npx tsc --noEmit

frontend/components/dashboard/DetailPanel.tsx

@@ -277,6 +277,15 @@ export function DetailPanel({
               </span>
             </div>
           )}
+          {panelSyncTimedOut && (
+            <div className="panel-loading-hint timed-out" role="alert">
+              <span>
+                {locale === "en-US"
+                  ? "Sync is taking longer than expected. Data shown may be incomplete."
+                  : "同步时间较长，当前展示的数据可能不完整。"}
+              </span>
+            </div>
+          )}
           <div className="panel-meta">
             <span className={clsx("risk-badge", panelRiskLevel)}>
               {getRiskBadgeLabel(panelRiskLevel, locale)}

frontend/components/dashboard/DetailPanelChrome.module.css

@@ -210,3 +210,24 @@
   font-size: 13px;
   line-height: 1.7;
 }
+
+.root :global(.panel-loading-hint) {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-top: 10px;
+  padding: 8px 12px;
+  border-radius: 10px;
+  background: rgba(77, 163, 255, 0.06);
+  border: 1px solid rgba(77, 163, 255, 0.1);
+  color: var(--color-accent-secondary);
+  font-size: 12px;
+  font-weight: 600;
+}
+
+.root :global(.panel-loading-hint.timed-out) {
+  background: rgba(245, 158, 11, 0.06);
+  border-color: rgba(245, 158, 11, 0.16);
+  color: var(--color-signal-warning);
+  font-size: 12px;
+}

frontend/components/dashboard/ScanTerminalDashboard.tsx

@@ -353,12 +353,25 @@ function ScanTerminalScreen() {
       <div className={scanTerminalRootClassName}>
         <div className={clsx("scan-terminal", themeMode === "light" && "light")}>
           <main className="scan-data-grid">
+            <div className="scan-topbar">
+              <div className="scan-topbar-title">
+                <strong>{isEn ? "AI Weather Decision Terminal" : "AI 天气交易决策台"}</strong>
+                <span>
+                  {isEn
+                    ? "Start from the map, then open city cards to verify weather evidence"
+                    : "从地图选城市，再打开决策卡验证天气证据"}
+                </span>
+              </div>
+              <div className="scan-topbar-actions">
+                <span className="scan-topbar-time">{userLocalTime}</span>
+              </div>
+            </div>
             <div className="scan-loading-state">
               <LoadingSignal
                 title={isEn ? "Preparing decision workspace" : "正在准备决策工作台"}
                 description={
                   isEn
-                    ? "Checking access, city context and today’s tradable weather windows."
+                    ? "Checking access, city context and today's tradable weather windows."
                     : "正在检查权限、城市上下文和今日可交易天气窗口。"
                 }
               />
@@ -461,6 +474,17 @@ function ScanTerminalScreen() {
               <li>{isEn ? "HKO observatory AI read" : "香港天文台观测 AI 解读"}</li>
               <li>{isEn ? "Smoother scrolling experience" : "滚动体验优化"}</li>
             </ul>
+            <button
+              type="button"
+              className="scan-announcement-dismiss"
+              aria-label={isEn ? "Dismiss" : "关闭"}
+              onClick={() => {
+                localStorage.setItem("polyweather_v156_announcement_seen_at", String(Date.now() + 90 * 24 * 60 * 60 * 1000));
+                setShowAnnouncement(false);
+              }}
+            >
+              ✕
+            </button>
           </section>
           ) : null}
 
@@ -534,6 +558,14 @@ function ScanTerminalScreen() {
                   {isEn ? "Scan failed" : "扫描失败"}
                 </div>
                 <div className="scan-empty-copy">{staleReason}</div>
+                <button
+                  type="button"
+                  className="scan-retry-button"
+                  onClick={() => refreshScanTerminalManually()}
+                >
+                  <RefreshCw size={13} />
+                  {isEn ? "Retry" : "重试"}
+                </button>
               </div>
             ) : (
               renderMainView()

frontend/components/dashboard/ScanTerminalShell.module.css

@@ -148,6 +148,32 @@
   padding: 7px 10px;
 }
 
+.root :global(.scan-announcement-dismiss) {
+  position: absolute;
+  top: 10px;
+  right: 12px;
+  width: 28px;
+  height: 28px;
+  display: grid;
+  place-items: center;
+  border: none;
+  border-radius: 8px;
+  background: rgba(148, 163, 184, 0.1);
+  color: #94a3b8;
+  font-size: 14px;
+  cursor: pointer;
+  transition: background 0.15s, color 0.15s;
+}
+
+.root :global(.scan-announcement-dismiss:hover) {
+  background: rgba(148, 163, 184, 0.22);
+  color: #e2e8f0;
+}
+
+.root :global(.scan-upgrade-announcement) {
+  position: relative;
+}
+
 .root :global(.scan-ghost-button),
 .root :global(.scan-cta-ghost),
 .root :global(.scan-theme-button),