feat: add print stylesheet section for Dashboard (Closes #805)

[waterWang]

Summary

Adds a print stylesheet section for the Dashboard page, following the same pattern as ClaimFlow and DisputeCard.

Changes

• src/pages/Dashboard.tsx: Added import "../styles/print.css" and wrapped StellarWaveEmptyState in a dashboard-chrome div
• src/styles/print.css: Added @media print section for .dashboard-container — hides chrome, forces white background and black text
• src/pages/Dashboard.print.test.ts: New file verifying the print stylesheet connection and CSS rules

Testing

• Dashboard.print.test.ts passes (2 tests)
• ClaimFlow.print.test.ts still passes (no regression)
• Follows the same pattern as existing print stylesheets (ClaimFlow, DisputeCard)

Closes #805

[vercel]

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