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/hooks/use-maint-shortcuts.ts

@@ -0,0 +1,71 @@
+import { useState, useEffect, useCallback } from 'react';
+
+export type MaintAction = {
+    endpoint: string;
+    label: string;
+    description: string;
+};
+
+const MAINT_ACTIONS: Record<string, MaintAction> = {
+    forceReady: {
+        endpoint: 'force-ready',
+        label: 'Force Ready',
+        description: 'Logout and re-login the agent to force Ready state on Ozonetel.',
+    },
+    unlockAgent: {
+        endpoint: 'unlock-agent',
+        label: 'Unlock Agent',
+        description: 'Release the Redis session lock so the agent can log in again.',
+    },
+    backfill: {
+        endpoint: 'backfill-missed-calls',
+        label: 'Backfill Missed Calls',
+        description: 'Match existing missed calls with lead records by phone number.',
+    },
+    fixTimestamps: {
+        endpoint: 'fix-timestamps',
+        label: 'Fix Timestamps',
+        description: 'Correct call timestamps that were stored with IST double-offset.',
+    },
+};
+
+export const useMaintShortcuts = () => {
+    const [activeAction, setActiveAction] = useState<MaintAction | null>(null);
+    const [isOpen, setIsOpen] = useState(false);
+
+    const openAction = useCallback((action: MaintAction) => {
+        setActiveAction(action);
+        setIsOpen(true);
+    }, []);
+
+    const close = useCallback(() => {
+        setIsOpen(false);
+        setActiveAction(null);
+    }, []);
+
+    useEffect(() => {
+        const handler = (e: KeyboardEvent) => {
+            if (e.ctrlKey && e.shiftKey && e.key === 'R') {
+                e.preventDefault();
+                openAction(MAINT_ACTIONS.forceReady);
+            }
+            if (e.ctrlKey && e.shiftKey && e.key === 'U') {
+                e.preventDefault();
+                openAction(MAINT_ACTIONS.unlockAgent);
+            }
+            if (e.ctrlKey && e.shiftKey && e.key === 'B') {
+                e.preventDefault();
+                openAction(MAINT_ACTIONS.backfill);
+            }
+            if (e.ctrlKey && e.shiftKey && e.key === 'T') {
+                e.preventDefault();
+                openAction(MAINT_ACTIONS.fixTimestamps);
+            }
+        };
+
+        window.addEventListener('keydown', handler);
+        return () => window.removeEventListener('keydown', handler);
+    }, [openAction]);
+
+    return { isOpen, activeAction, close };
+};