Add IoT integration dashboard UI

[Adeolu01]

Summary

Implements the IoT integration dashboard interface (Live Fleet Stream) with metric cards, charts, and telemetry visualization, following the project's Component -> Hook -> Service architecture.

• Live Fleet Stream banner with an animated live indicator
• Highlight cards for Cold Chain Integrity (current temperature, compliance rate) and Shock Monitoring (current G-force, impact event count)
• Four-column metrics section: Temperature, Humidity, GPS Signal, Battery Level
• Two Recharts visualizations: a temperature/humidity area+line chart over time, and a bar chart of shock events by G-force
• Charts are wrapped with role="img" and descriptive aria-label/sr-only trend summaries for screen reader accessibility

Architecture

• Service: services/iotDashboardService.ts - getIoTDashboardData(), axios-based, follows the existing faqService.ts pattern
• Hook: hooks/useIoTDashboard.ts - useQuery wrapper with a 10s refetchInterval to simulate a live stream
• Component: components/product/IoTDashboard.tsx - consumes useIoTDashboard() only, no inline mock data; renders a skeleton while loading and an alert on error

Integration

• New route at app/product/iot-dashboard/page.tsx rendering IoTDashboard
• Does not touch the existing, unrelated components/fleet/ (driver location) feature

Testing

• npx tsc --noEmit: no errors in files touched by this change (pre-existing unrelated errors elsewhere in the repo are untouched)
• npx eslint on the changed files: 0 errors, 0 warnings
• Manually verified chart rendering, loading skeleton, and responsive grid at mobile/tablet/desktop widths

Notes

• Backend endpoint /api/iot/dashboard is assumed per the issue spec. Until it exists, the page shows its loading/error state.

closes #310

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