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- Install pdfjs-dist v5 and add optimizeDeps pre-bundle config - New PdfViewer.svelte component: renders each page on a <canvas> with correct device-pixel-ratio scaling, overlays a text layer (enables text selection; foundation for annotations in #40), prev/next navigation, zoom controls, and lazy page rendering (only current ±1 pre-fetched — avoids freezing on multi-page documents) - Replace the <iframe> in documents/[id]/+page.svelte with PdfViewer; image attachments continue to use <img>; detection now uses doc.contentType instead of filename extension - Unit tests for navigation controls and page counter (pdfjs mocked) - E2E tests: PDF renders as canvas (not iframe), nav controls visible, image fallback stays as <img>; minimal.pdf fixture for upload tests Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>