fix: hide repair trades from position chart markers

[miohtama]

Why

Position charts could show repair counter-trades as normal increase/decrease markers. In Hyper AI this surfaced as a tooltip for trade #849 showing an Increase position marker with $0.00 trade value, even though the live payload identifies the trade as trade_type: repair for repairing another trade.

Lessons learnt

Filtering only trades with repaired_at removes original repaired trades, but it does not remove repair counter-trades. Chart marker generation needs to exclude trade_type === repair as well. Vault-style trades may also need reserve fields for a meaningful USD display value.

Summary

• Exclude repair trades from position chart marker generation.
• Use reserve notional as the marker USD value fallback for vault-style trades.
• Add regression coverage for both repair markers and vault reserve-value display.