Selected Vessel Historical Tracks Across Zoom Levels

Feature Request:

Enable selected vessel tracks to load reliably across historical windows and at low zoom levels, so analysts can follow one vessel or a small selected cohort over longer time periods without needing to zoom in past 6.0.

User Story:

As a Maritime Operations Officer or analyst, I want to view selected vessel tracks over historical periods, including up to one month, at low zoom levels, so that I can reconstruct vessel movements, identify port calls, and understand behaviour without losing the track when zooming out.

Acceptance Criteria:

• Users can select one vessel or a small MMSI-only cohort and view its historical track below 6.0 zoom.

• Selected vessel tracks remain visible globally/across zoom levels where the user is focused on that selected cohort.

• Users can load historical selected-vessel tracks over longer windows, including up to one month where data is available.

• Track loading provides clear progress/status feedback and does not require repeated map zooming to reveal the selected track.

• Behaviour works in both live and historical workflows where selected-vessel history is available.