feat(ui): topbar settings, hide dev badge, premium fleet cards

Collapse the redundant left workspace nav (overview is already the home
surface) and move Settings into the top bar. Hide placeholder `dev`
version badges. Restyle fleet cards with softer elevation, status
summary chips, hover sheen, and reduced-motion-safe entrance motion.

apps/web/src/app-shell.tsx

@@ -399,6 +399,13 @@ function Page({
   );
 }
 
+function displayConsoleVersion(version: string | undefined): string | undefined {
+  if (!version) return undefined;
+  const trimmed = version.trim();
+  if (!trimmed || trimmed.toLowerCase() === 'dev' || trimmed === '0.0.0') return undefined;
+  return trimmed;
+}
+
 export function AppShell({
   pathname,
   version = 'dev',
@@ -585,8 +592,9 @@ export function AppShell({
     eventStreamClient ?? defaultEventStreamClient,
   );
   const currentSection = section(route);
+  const consoleVersion = displayConsoleVersion(version);
   return (
-    <div className="app-shell" data-route={route.kind}>
+    <div className="app-shell" data-route={route.kind} data-section={currentSection ?? 'other'}>
       <a className="skip-link" href="#main-content">
         跳到主要内容
       </a>
@@ -594,26 +602,23 @@ export function AppShell({
         <a className="product-name" href="/fleet">
           多实例 SimAdmin 管理台
         </a>
-        <span className="connection-status">控制台</span>
-        <span>版本 {version}</span>
+        <div className="topbar-actions">
+          <span className="connection-status">控制台</span>
+          {consoleVersion ? (
+            <span className="version-badge" aria-label={`控制台版本 ${consoleVersion}`}>
+              v{consoleVersion}
+            </span>
+          ) : null}
+          <a
+            className="topbar-settings"
+            href="/settings/system"
+            aria-current={currentSection === 'settings' ? 'page' : undefined}
+          >
+            设置
+          </a>
+        </div>
       </header>
-      <div className="app-layout">
-        <nav className="global-navigation" aria-label="全局导航">
-          <ul>
-            {(
-              [
-                ['fleet', '/fleet', '实例总览'],
-                ['settings', '/settings/system', '设置'],
-              ] as const
-            ).map(([key, href, label]) => (
-              <li key={key}>
-                <a href={href} aria-current={currentSection === key ? 'page' : undefined}>
-                  {label}
-                </a>
-              </li>
-            ))}
-          </ul>
-        </nav>
+      <div className="app-layout app-layout-single">
         <main id="main-content" tabIndex={-1}>
           {routeInstanceId && instanceLoading ? (
             <p role="status">正在加载实例…</p>