feat: port tauri header top-menu to admin topbar

Rebuild admin Topbar to match clinic-pro-tauri header:
- Icon order: theme -> settings -> bell (was theme -> bell -> settings)
- Settings gear now navigates to the role-based settings page
  instead of opening the personalization panel
- Search placeholder changed to «جستجو», dropped the ⌘K hint
- Add ProfileMenu: avatar + user name + context/role subtitle + caret,
  with a dropdown (profile / payments / settings / personalization / logout).
  Links are role-aware; personalization keeps the existing settings panel.

Frontend-only, no API changes. Adds ProfileMenu.test + Topbar.test.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

assets/admin/styles.css

@@ -457,6 +457,43 @@ body {
 .topbar-crumbs { display: flex; align-items: center; gap: 8px; color: var(--text-3); font-size: 13px; }
 .topbar-crumbs b { color: var(--text); }
 
+/* ── Profile menu (topbar) — معادلِ MenuProfile در clinic-pro-tauri ── */
+.profile-trigger {
+  display: flex; align-items: center; gap: 8px; flex-shrink: 0;
+  padding: 4px 6px; border-radius: var(--r-sm);
+  background: none; border: 1px solid transparent; cursor: pointer;
+  transition: .15s; color: var(--text);
+}
+.profile-trigger:hover { background: var(--surface-2); border-color: var(--border); }
+.profile-meta { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.35; overflow: hidden; }
+.profile-meta b    { font-size: 13px; font-weight: 600; color: var(--text); white-space: nowrap; }
+.profile-meta span { font-size: 11.5px; color: var(--text-3); white-space: nowrap; }
+.profile-caret { color: var(--text-3); }
+/* موبایل: فقط آواتار (مثل md:hidden در tauri) */
+@media (max-width: 640px) {
+  .profile-meta, .profile-caret { display: none; }
+}
+
+.profile-menu {
+  z-index: 9000; min-width: 190px; overflow: hidden;
+  padding: 8px; display: flex; flex-direction: column; gap: 2px;
+  background: var(--surface); border: 1px solid var(--border);
+  border-radius: var(--r); box-shadow: var(--shadow-lg);
+}
+.profile-item {
+  display: flex; align-items: center; gap: 8px;
+  width: 100%; padding: 8px 10px; border-radius: var(--r-sm);
+  font-size: 13px; font-weight: 500; color: var(--text-2);
+  background: transparent; border: none; cursor: pointer; text-align: right;
+  transition: .12s;
+}
+.profile-item:hover { background: var(--surface-2); color: var(--text); }
+.profile-item.danger {
+  margin-top: 6px; justify-content: center;
+  color: var(--on-primary); background: var(--danger); font-weight: 600;
+}
+.profile-item.danger:hover { background: var(--danger); filter: brightness(0.94); color: var(--on-primary); }
+
 /* در dark مرز سایدبار/هدر محو است — مثل clinic-pro-tauri */
 [data-theme="dark"] .sidebar,
 [data-theme="dark"] .sidebar-brand,