Add report export to PDF

[neyec]

Summary

• Enables the disabled "Export Report" button on the reporting page to generate downloadable PDF compliance reports
• Uses jspdf + jspdf-autotable via dynamic import (code-split, only loaded on click)
• Generates professional A4 PDFs with cover page (project info, risk classification, per-area completion stats) and content pages (question/response/status tables per area)
• Fully translated PDF labels for all 4 UI languages (en, es, fr, de)

Test plan

• Navigate to Reporting > any framework with evidence, click "Export Report" — PDF downloads
• Verify cover page shows project name, risk classification, date, and completion summary table
• Verify each area renders with question tables, evidence text, and colour-coded status
• Test with empty evidence — PDF generates with "Not Answered" status
• Switch language to Spanish/French/German and export — labels should be translated
• Verify button shows spinner while generating and re-enables after download

Closes #32

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