feat: agent detail page, campaign edit slideout, integration config, auth persistence

Agent Detail (/agent/:id):
- Individual agent performance page with KPI cards + call log table
- Clickable agent names in dashboard table link to detail view
- Back button to Team Dashboard

Campaign Edit Slideout:
- Edit button on each campaign card
- Slideout with name, status, budget, dates
- Saves via updateCampaign GraphQL mutation

Integration Config Slideout:
- Configure button on each integration card
- Per-integration form fields (Ozonetel, WhatsApp, Facebook, etc.)
- Copy webhook URL, OAuth placeholder buttons

Auth Persistence:
- User data persisted to localStorage on login
- Session restored on page refresh — no more logout on F5
- Stale tokens cleaned up automatically

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

src/main.tsx

@@ -18,6 +18,7 @@ import { ReportsPage } from "@/pages/reports";
 import { PatientsPage } from "@/pages/patients";
 import { TeamDashboardPage } from "@/pages/team-dashboard";
 import { IntegrationsPage } from "@/pages/integrations";
+import { AgentDetailPage } from "@/pages/agent-detail";
 import { SettingsPage } from "@/pages/settings";
 import { AuthProvider } from "@/providers/auth-provider";
 import { DataProvider } from "@/providers/data-provider";
@@ -56,6 +57,7 @@ createRoot(document.getElementById("root")!).render(
                                 <Route path="/reports" element={<ReportsPage />} />
                                 <Route path="/integrations" element={<IntegrationsPage />} />
                                 <Route path="/settings" element={<SettingsPage />} />
+                                <Route path="/agent/:id" element={<AgentDetailPage />} />
                                 <Route path="/patient/:id" element={<Patient360Page />} />
                                 <Route path="*" element={<NotFound />} />
                             </Route>