feat: add shortenAddress helper for wallet address display — Close #423

[pixels26]

Summary

Adds a shortenAddress utility to format long Stellar wallet addresses for UI display. Full addresses are shortened to first 4 + ... + last 4 characters (e.g. GABC...XY12).

Closes #423

Changes

• src/lib/web3/format.ts — Simplified shortenAddress(address) to:
  • Return the full address unchanged when shorter than 10 characters
  • Otherwise return first 4 + ... + last 4
  • Return empty string for falsy input
• src/lib/web3/__tests__/format.test.ts — New test file with 5 unit tests covering:
  • Standard Stellar address → correctly shortened (GABC...1234)
  • Address shorter than 10 characters → returned as-is
  • Exactly 9-character address → returned as-is
  • Exactly 10-character address → correctly shortened
  • Empty string → returns empty string

Acceptance Criteria

• Standard Stellar address returns correctly shortened form
• Addresses shorter than 10 characters are returned as-is
• Unit tests cover all cases

Testing

pnpm vitest run src/lib/web3/__tests__/format.test.ts

# Output:
#  ✓ src/lib/web3/__tests__/format.test.ts (5 tests)
# Test Files  1 passed (1)
#      Tests  5 passed (5)

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