Export Iceberg Timeline data (CSV/JSON)

The Icebergs Tracker timeline is excellent for verifying detections — you can see every aggressor fill, refresh event, reprio and delete with millisecond timestamps and order IDs. However, this data is currently trapped in the tooltip UI.

Request: Add an export option for timeline data, ideally at two levels:

1. Per-iceberg: a "Download Timeline" button on the detail card (CSV or JSON) with all events: timestamp, kind (TRD/EVT), action, volume, price, aggressor/passive order IDs, confidence flags (native refresh, reprio, delete).

2. Per-session batch export: all detected icebergs for the session in one file, one row per iceberg with summary fields (side, price, executed, hidden, max visible, ratio, duration, confidence, refresh count) plus optionally the full event log.

   Use case: quantitative validation. Many of us are building datasets to test whether iceberg detections near key levels have predictive value (absorption studies, level defense statistics). Right now this requires manual transcription from screenshots. Structured export would make the tracker auditable and let users properly backtest signal quality — which ultimately demonstrates the value of the indicator itself.