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/components/layout/sidebar.tsx

@@ -110,7 +110,17 @@ export const Sidebar = ({ activeUrl = "/" }: SidebarProps) => {
 
             {/* Account card */}
             <div className="mt-auto flex flex-col gap-5 px-2 py-4 lg:gap-6 lg:px-4 lg:py-4">
-                <NavAccountCard onSignOut={handleSignOut} />
+                <NavAccountCard
+                    items={[{
+                        id: 'current',
+                        name: user.name,
+                        email: user.email,
+                        avatar: '',
+                        status: 'online' as const,
+                    }]}
+                    selectedAccountId="current"
+                    onSignOut={handleSignOut}
+                />
             </div>
         </aside>
     );