fix(stats): compute average fee and total fees only across sent transactions (#58)

[ghzhost]

Summary

Fixes #58.

Problem

on Dashboard, on History, and were calculating/accumulating transaction fees across all transactions ( and alike). Because Stellar transaction fees are paid solely by the sender's account (), received transactions reflect fees paid by counterparties rather than the user's wallet. Blending received fees into user statistics skewed 'Average Fee' and 'Total Fees' with external costs.

Changes

1. ****: Calculate using and sum fees across transactions only (returning if no transactions were sent).
2. ** ()**: Sum only across .
3. ** ()**: Only accumulate into daily fee statistics when .
4. ****: Add test coverage verifying that isolates sent transaction fees and ignores counterparty fees on received transactions.

Testing

• Vitest suite executed cleanly: all 28 test files and 115 tests passing.
• Verified TypeScript compilation and full production build with Version 5.4.5
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