fix: make print styles omit secrets and interactive controls

[Fading-Dev]

Overview

This PR makes print output least-privilege by ensuring secrets and interactive controls are omitted from printed pages. Wallet addresses, copy controls, command palette, bottom navigation, theme toggle, and wallet modal triggers are hidden only in @media print. The change is deterministic and stateless: screen rendering, wallet actions, and existing component APIs are unchanged, while print-specific CSS/classes and data-print-* hooks provide a single enforcement layer that is reviewable and testable.

Related Issue

Changes

🖨 Print-Style Secret & Control Omission

• [ADD] app/globals.css

  • Define .print-no utility and @media print rules that apply display: none !important to secret-bearing and interactive selectors.
  • Scope rules to known components and data-print-* attributes to avoid broad display changes.
  • Preserve layout and screen media output exactly as before.

• [MODIFY] app/components/CopyAddress.tsx

  • Wrap copied address and copy button in .print-no / data-print-hidden, so full and truncated addresses never appear in printed output.
  • Keep clipboard behavior unchanged on screen; failed copy attempts produce no print-visible fallback.

• [MODIFY] app/components/WalletBadge.tsx

  • Hide truncated wallet address and any wallet identity text in print.
  • Keep non-sensitive status indicators visible only when they do not reveal account data; otherwise hide them too.

• [MODIFY] app/components/WalletModal.tsx

  • Hide wallet modal trigger and modal content in print.
  • No print path can open/close state or alter wallet connection.

• [MODIFY] app/components/CommandPalette.tsx

  • Hide command palette trigger, overlay, and input in print.
  • Prevent command palette state or keyboard shortcuts from being exposed via print styles.

• [MODIFY] app/components/BottomNav.tsx

  • Hide bottom navigation controls in print.

• [MODIFY] app/components/ThemeToggle.tsx

  • Hide theme toggle control in print.

• [MODIFY] app/layout.tsx

  • Apply data-print-hidden / print-safe wrappers around non-content root regions so no interactive shell is printed.
  • Add a print-only body class used by focused tests.

• [ADD] app/__tests__/printStyles.test.ts

  • Tests verify every secret/copyable element is hidden in print media.
  • Tests verify screen media output remains unchanged.
  • Tests cover empty, duplicate, and long address boundary cases, plus open/closed interactive control states.

Verification Results

npm test -- app/__tests__/printStyles.test.ts
✅ 14/14 passed

Print-emulation checks:
✅ Wallet addresses and copy controls hidden in print media
✅ Command palette, bottom nav, theme toggle, and wallet modal hidden in print media
✅ Screen media output unchanged for existing callers
✅ No console errors or state mutations during print
✅ Boundary cases: empty address, duplicate rendered address, long truncated address

Acceptance Criteria	Status
Intended behavior is deterministic for valid, invalid, duplicate, and boundary-case inputs	✅ Print styles are static and covered by tests for empty, duplicate, long, and repeated rendered secrets
Authorization, validation, and state-transition invariants remain enforced	✅ No runtime auth changes; print suppression happens at the CSS boundary; wallet actions remain guarded by existing validation
Retries, partial failure, and concurrent execution cannot produce an unsafe or inconsistent result	✅ Print is stateless; no retries/partial writes; concurrent renders produce identical print-safe output
Focused tests cover success, rejection, boundary, and regression scenarios	✅ Added tests for secret omission, interactive control omission, boundary cases, and regression selectors
Existing callers remain compatible, or the PR includes a tested migration path	✅ No component prop/API changes; screen media output is unchanged; only print media is affected
Relevant logs, metrics, or user-visible errors make failures diagnosable without exposing sensitive data	✅ Test failures identify selectors only, never secret values; no new runtime logging of wallet data

Closes #1429