Add interactive osm map to the vis server with points/polygons overlaid

[piperwolters]

Add interactive map with the ROI highlighted (just a bbox for points and polygons) to the vis server for each window visualized.

[Copilot]

Pull request overview

Adds an interactive OpenStreetMap/Leaflet map tile to the visualization server, overlaying each window’s geometry, and improves OpenStreetMap data source ergonomics (better config parsing + earlier failure for missing extracts).

Changes:

• Add Leaflet-based per-window interactive map to the vis UI (with server-side proxying for Leaflet assets and basemap tiles).
• Add window_geometry_geojson() helper to serialize window geometry into WGS84 GeoJSON for the UI.
• Improve OpenStreetMap data source: accept feature type strings in configs and raise a clearer error when multiple configured PBF extracts are missing; add integration tests for both.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/integration/data_sources/test_openstreetmap.py	Adds coverage for missing-PBF error behavior and jsonargparse parsing of OSM feature type strings.
rslearn/vis/vis_server.py	Proxies Leaflet assets + OSM tiles via Flask routes and injects per-window geometry into the template context.
rslearn/vis/utils.py	Adds GeoJSON serialization for Window geometry in WGS84.
rslearn/vis/templates/visualization.html	Renders a Leaflet map per window and overlays the geometry (polygon outline / point marker).
rslearn/data_sources/openstreetmap.py	Adds feature-type string coercion and early FileNotFoundError when configured PBF extracts are missing; resolves local ds_path for consistent joins.

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