Add dashboard analytics internationalization

[Agbasimere]

Closes #534

Summary

• replace hardcoded Dashboard Analytics UI copy with localized strings
• add shared dashboard analytics translation helpers and locale entries for en, es, and ar
• localize chart controls, drill-down labels, realtime status text, toast messages, export headers, and date labels
• update dashboard and visualization tests to cover the i18n-aware behavior

What changed

• added src/components/dashboard/dashboardI18n.ts to centralize dashboard analytics translation lookups and fallbacks
• updated dashboard components and hooks to use the existing useInternationalization flow
• made generated analytics date labels locale-aware
• made CSV export headers locale-aware
• expanded locale JSON files with dashboard analytics keys
• updated focused dashboard tests and added a locale-sensitive date-label test

Testing

• locale JSON parse check passed with Node
• automated Vitest run is currently blocked in this environment because node_modules is missing, so vitest is not installed here

Notes

• no staging or production deployment was performed from this environment
• branch pushed: codex-dashboard-analytics-i18n
• commit: ed4fe06

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