dashboard: Fee Metrics live-FX profit, net total, and External table UX

[yrong]

Summary

• Live-FX Profit: P→E and V2 E→P Fee Metrics Profit is computed at live ETH/DOT spot prices (fee − delivery cost), so it matches Total Income − Expend instead of drifting via historical income_sum. V1 E→P still uses indexed historical income (fees not reliably in ETH).
• All Snowbridge Fee Profit: highlighted strip above Fee Metrics:
  P↔E service (V1+V2 Snowbridge) + P↔K service − two-phase BEEFY
  External relayer profit is excluded. Per-lane Profit cards still do not subtract two-phase; only this net total does.
• P→E layout: Consensus Update (Beefy) is shown before V1 (Legacy).
• External transfers table: client-side pagination (5 rows per page) with Prev/Next; API still caps at 100 most-recent transfers.

Test plan

• Fee Metrics 7d / 60d: P→E Profit ≈ Total Income − Expend (within rounding)
• All Snowbridge Fee Profit ≈ sum of Snowbridge P↔E profits + P↔K − two-phase cost; External not included
• P→E section order: Consensus Update → V1 → V2 …
• External table pages at 5 rows; Prev/Next and range label work