feat(transfers): add print styles for dashboard (#217)

[Hollujay]

Description

Add print styles for the dashboard (Transfers page) so users can print their transfer overview with a clean, readable layout — hiding chrome, interactive controls, and optimising colours for paper.

Changes Made

New files

• src/print.css — Global @media print stylesheet:

  • Resets body to white background + black text
  • Hides chrome (navbar, footer, skip-link, scroll-to-top)
  • Hides all .btn elements
  • Applies white backgrounds with visible #ccc borders to surface elements (transfer rows, chart, cards)
  • Overrides status badge colours with print-friendly light backgrounds (green/amber/red)
  • Preserves chart bar colours via print-color-adjust: exact
  • Sets @page margin to 1.5cm

• test/print-styles.test.js — 14 tests covering:

  • Global print.css rules (chrome hiding, body reset, badge overrides, @page margin)
  • Page-specific rules in Transfers.css (filter hiding)
  • Component-specific rules in Chart.css (tooltip/download hiding)
  • App.jsx imports print.css

Modified files

• src/App.jsx — Import ./print.css
• src/pages/Transfers.css — Add @media print to hide filters and buttons
• src/components/Chart.css — Add @media print for border, break-inside, tooltip/download hiding
• README.md — Document print support under Features

Testing

• 14 new print-style-specific tests pass
• All existing tests unaffected (pre-existing failures in AppContext.wallet.test.jsx and select-all-across-pages.test.jsx are unrelated)
• Tested by running npx vitest run test/print-styles.test.js test/contrast.test.js test/touch-targets.test.js test/safe-area.test.js test/locale-context.test.jsx test/components/Chart.test.jsx test/integration/transfers-filter.test.jsx test/unit/format.test.js — 8 files, 94 tests passed

Checklist

• Tests pass locally
• Code follows style guidelines
• Documentation updated
• No breaking changes

Closes #217

[arisu6804]

LGTM — clean, thanks! 🚀

[arisu6804]

Reads well. 🚀