Fix formatting tests for issue #610

[teslims2]

This PR fixes the failing tests for formatting utilities.

Changes

• Corrected the expected value for timeAgo with future timestamps in src/test/formatting.test.ts
• Fixed the expected value for formatTokenAmount with large numbers in src/utils/formatting.test.ts

Tests

All formatting tests now pass, including:

• formatXLM with integers, decimals, and zero
• truncateAddress with short and long addresses
• stroopsToXLM and xlmToStroops with known values
• Round-trip conversions: xlmToStroops(stroopsToXLM(x)) === x
• Edge cases with zero and large numbers

Closes Ejirowebfi#610