Add page navigation to PDF previews

[jeonghun-jj-lee]

Closes #334

Summary

• add PDF page navigation before zoom
• make the page and zoom pills share one translucent surface
• support manual page entry with strict integer validation; invalid or out-of-range values restore the current page

Testing

• bun run test:e2e -- preview-baseline-contract.spec.ts
• bun run typecheck

[coderabbitai]

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