feat(errors): implement React SectionErrorBoundary components with fallback UI, logging hook, and retry options

[Babin123456]

Description

This PR implements React Error Boundary components for critical application sections to prevent whole-page crashes when unhandled runtime errors occur.

Closes #577
ECSoc 2026 Contribution

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Acceptance Criteria Checklist

• Friendly Fallback UI: Designed an error fallback card featuring an alert icon, clear error title, explanatory message, and optional collapsible technical stack trace details.
• Error Logging Hook: Created useErrorLogger custom hook and integrated error reporting via reportLovableError and console diagnostics.
• Retry Option: Included a "Try again" button that resets the error boundary state and invokes onRetry callback to re-render the section.

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Changes Made

• frontend/src/components/errors/SectionErrorBoundary.tsx: Created class-based React Error Boundary component with state reset, reporting integration, and fallback UI.
• frontend/src/hooks/useErrorLogger.ts: Created error logging hook.
• frontend/src/components/errors/index.ts: Exported error boundaries and error pages.
• frontend/src/components/layout/DashboardLayout.tsx: Wrapped main page view (<Outlet />) and Right Activity Panel (<RightPanel />) in <SectionErrorBoundary>.
• frontend/src/components/__tests__/ErrorBoundary.test.tsx: Added Vitest unit test suite for Error Boundary rendering, error capturing, and retry behavior.

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Testing Performed

• Ran npm test — Error Boundary Vitest test suite passed.
• Tested component error simulation to verify fallback UI and retry button state reset.
• Ran npm run typecheck & npm run lint — passed with 0 errors.