feat(wallet-modal): add tooltip primitive to copy-address button (Closes #783)

[waterWang]

Summary

Wires the shared Tooltip primitive to the icon-only copy-address button in WalletModal (Closes #783).

The copy button already had an aria-label for screen readers, but sighted mouse/touch users had no visual affordance explaining what the small icon does. This change wraps it in the repo's Tooltip primitive:

• Default: shows "Copy wallet address" on hover / focus / long-press.
• After copy: switches to "Address copied" to confirm the action, mirroring the existing aria-label behavior.

Changes

• src/pages/WalletModal.tsx
  • Imported TooltipProvider, Tooltip, TooltipTrigger, TooltipContent from @/components/ui/tooltip.
  • Wrapped the copy-address <button> in the tooltip, with dynamic content keyed on the copied state.
• src/pages/__tests__/WalletModal.test.tsx
  • Mocked @/constants/wallet-kits.constant to avoid the ESM stellar-wallets-kit import failing under Jest.
  • Added a WalletModal — copy-address tooltip (#783) describe block with two new tests:
    • renders the copy button as a tooltip trigger when a wallet is connected
    • shows "Copy wallet address" tooltip content when the trigger is opened

Accessibility (WCAG 2.1 AA)

• The tooltip follows the WAI-ARIA tooltip pattern (Radix handles role="tooltip" + aria-describedby).
• Keyboard: trigger is focusable; tooltip opens on focus and dismisses on blur.
• Touch: long-press (600ms) reveals the tooltip for mobile users.
• Reduced motion: Radix tooltip's fade/zoom animation classes are governed by the existing design system; no new motion is introduced.

Test

PASS src/pages/__tests__/WalletModal.test.tsx
  WalletModal — reduced-motion fallback (#633)
    ✓ 3 tests
  WalletModal — copy-address tooltip (#783)
    ✓ renders a copy button with a tooltip trigger when a wallet is connected
    ✓ shows 'Copy wallet address' tooltip content when the tooltip is opened
Test Suites: 1 passed, Tests: 5 passed

Closes #783

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