feat: SSE agent state, UCID fix, maint module, QA bug fixes

- Fix outbound disposition: store UCID from dial API response (root cause of silent disposition failure)
- SSE agent state: real-time Ozonetel state drives status toggle (ready/break/calling/in-call/acw)
- Maint module with OTP-protected endpoints (force-ready, unlock-agent, backfill, fix-timestamps)
- Maint OTP modal with PinInput component, keyboard shortcuts (Ctrl+Shift+R/U/B/T)
- Force-logout via SSE: admin unlock pushes force-logout to connected browsers
- Silence JsSIP debug flood, add structured lifecycle logging ([SIP], [DIAL], [DISPOSE], [AGENT-STATE])
- Centralize date formatting with IST-aware formatters across 11 files
- Fix call history: non-overlapping aggregates (completed/missed), correct timestamp display
- Auto-dismiss CallWidget ended/failed state after 3 seconds
- Remove floating "Helix Phone" idle badge from all pages
- Fix dead code in agent-state endpoint (auto-assign was unreachable after return)

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

src/pages/login.tsx

@@ -8,11 +8,14 @@ import { Button } from '@/components/base/buttons/button';
 import { SocialButton } from '@/components/base/buttons/social-button';
 import { Checkbox } from '@/components/base/checkbox/checkbox';
 import { Input } from '@/components/base/input/input';
+import { MaintOtpModal } from '@/components/modals/maint-otp-modal';
+import { useMaintShortcuts } from '@/hooks/use-maint-shortcuts';
 
 export const LoginPage = () => {
     const { loginWithUser } = useAuth();
     const { refresh } = useData();
     const navigate = useNavigate();
+    const { isOpen, activeAction, close } = useMaintShortcuts();
 
     const saved = localStorage.getItem('helix_remember');
     const savedCreds = saved ? JSON.parse(saved) : null;
@@ -176,6 +179,8 @@ export const LoginPage = () => {
 
             {/* Footer */}
             <a href="https://f0rty2.ai" target="_blank" rel="noopener noreferrer" className="mt-6 text-xs text-primary_on-brand opacity-60 hover:opacity-90 transition duration-100 ease-linear">Powered by F0rty2.ai</a>
+
+            <MaintOtpModal isOpen={isOpen} onOpenChange={(open) => !open && close()} action={activeAction} />
         </div>
     );
 };