中控支持一键安装到桌面，HTTPS 下可装成独立应用。

Co-authored-by: Cursor <cursoragent@cursor.com>

static/hub.css

@@ -169,11 +169,16 @@ a:hover { color: #7dd3fc; }
 .nav-spot--flat .nav-spot-last,
 .nav-spot--flat .nav-spot-chg,
 .nav-spot--flat .nav-spot-pct { color: #9aa3bf; }
-.topbar-logout {
+.topbar-actions {
   position: fixed;
   top: 16px;
   right: 22px;
   z-index: 20;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+.topbar-logout {
   color: var(--muted);
   font-size: 0.82rem;
   letter-spacing: 0.04em;
@@ -181,6 +186,39 @@ a:hover { color: #7dd3fc; }
 .topbar-logout:hover {
   color: #e8f1ff;
 }
+.topbar-install {
+  appearance: none;
+  border: 1px solid #304164;
+  background: #151a2a;
+  color: #dbe4ff;
+  font-size: 0.78rem;
+  border-radius: 8px;
+  padding: 4px 10px;
+  cursor: pointer;
+  font-family: inherit;
+}
+.topbar-install:hover {
+  color: #ffffff;
+  border-color: #3d5278;
+}
+.topbar-install-hint {
+  position: fixed;
+  top: 46px;
+  right: 22px;
+  z-index: 20;
+  margin: 0;
+  max-width: min(360px, calc(100vw - 40px));
+  color: var(--muted);
+  font-size: 0.75rem;
+  line-height: 1.4;
+  text-align: right;
+}
+@media (display-mode: standalone) {
+  .topbar-install,
+  .topbar-install-hint {
+    display: none !important;
+  }
+}
 @media (max-width: 1100px) {
   .topbar-row {
     grid-template-columns: 1fr;