fix: wire role-based views — sidebar auth, user display, table tabs, card actions

- Sidebar: use useAuth() for isAdmin and pass auth user to NavAccountCard
- NavAccountCard: fix bug where items prop was ignored (used placeholderAccounts)
- TopBar: replace hardcoded "SM" initials with user.initials from auth
- All Leads: add "My Leads" tab filtering by assignedAgent matching user
- Lead Card: add role-aware action buttons (Call/Disposition for assigned leads)
- Lead Workspace: pass onLogCall/onUpdateStatus handlers to LeadCard

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/pages/lead-workspace.tsx

@@ -37,6 +37,14 @@ export const LeadWorkspacePage = () => {
         // placeholder
     };
 
+    const handleLogCall = () => {
+        // placeholder
+    };
+
+    const handleUpdateStatus = () => {
+        // placeholder
+    };
+
     return (
         <div className="flex flex-1 flex-col">
             <TopBar title="Lead Workspace" subtitle="Ramaiah Memorial Hospital · Last 24 hours" />
@@ -69,6 +77,8 @@ export const LeadWorkspacePage = () => {
                                     onMessage={handleMessage}
                                     onMarkSpam={handleMarkSpam}
                                     onMerge={handleMerge}
+                                    onLogCall={handleLogCall}
+                                    onUpdateStatus={handleUpdateStatus}
                                 />
                             ))}
                             {displayLeads.length === 0 && (