[Dashboard] Panel sub-nav menu + clearer profile button (name, not phone digit)

Logged-in panels (admin/employer/job-seeker) now show a sticky role-based dashboard menu (_PanelNav) on Employer/Index, Me/Index and Admin/Overview, with the active section highlighted — so users have an obvious menu and dashboard, not just a hidden avatar. Profile button: avatar fallback shows a 👤 glyph instead of the phone's first digit (the confusing '0'), and the desktop button now shows the user's name (or «حساب من») so it reads as a profile menu.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/JobsMedical.Web/Pages/Employer/Index.cshtml

@@ -10,6 +10,8 @@
     };
 }
 
+<partial name="_PanelNav" />
+
 <div class="page-head">
     <div class="container">
         <h1>پنل مرکز درمانی</h1>