test(frontend): add snapshot tests for PDF reports (#54)

[Owolabenjade]

Closes #54

What changed

• PDF Snapshot Tests: Added dashboard/src/app/pdf.test.ts to render production PDFs, intercept downloads via subclass mock wrapping, and parse the output text structure using pdf-parse.
• Text Anchors & Page Count Assertions: Confirmed that the extracted text contains all necessary anchors (header titles, prices, line items, and medications) and asserted correct page counts.
• Vite/Vitest Config: Configured vitest.config.ts to include the PDF tests and run them under the node environment (preventing test timeouts under jsdom's worker scheduling).
• FS Interceptors: Monkeypatched fs.readFileSync for 05-versions-space.pdf to redirect it to the actual file within node_modules during import, allowing the pdf-parse synchronous self-test to pass.
• Regeneration Runbook: Added docs/runbooks/pdf-regenerate-snapshots.md explaining how to update PDF snapshots.

How to test

Run the PDF snapshot test suite:

npx vitest run pdf.test.ts

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