feat(i18n): localize performance analytics dashboard

[AlphaMaleBaDI]

Closes #509

Summary

While investigating Dashboard Analytics internationalization support, I found that the primary dashboard analytics module had already been internationalized in a previously merged implementation.

This PR completes the remaining analytics-related internationalization work by localizing the Performance Dashboard components under src/components/performance.

Changes Made

Locale Support

Added a new performance translation namespace to:

• en.json
• es.json
• ar.json

Components Localized

• PerformanceMonitor.tsx
• CoreWebVitals.tsx
• OptimizationSuggestions.tsx
• PerformanceDashboard.tsx

Architecture

• Preserved the existing telemetry architecture.
• Kept performanceUtils.ts translation-agnostic.
• Localized all user-facing strings at the presentation layer.
• Used useInternationalization and translateWithFallback to maintain consistency with the existing dashboard i18n implementation.

Verification

• node scripts/check-locales.mjs
• pnpm lint
• Targeted performance utility tests

Results:

• Locale validation passed
• ESLint passed with zero warnings/errors
• No regression to telemetry utilities

Notes

Industry-standard telemetry metric identifiers (LCP, CLS, INP, FCP, and TTFB) were intentionally left untranslated to preserve consistency with web performance standards.

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