[t-kramer]

We're on pace for ~6.4M CARTO tile requests a month, above the 5M free allowance. CARTO has given us 10M temporarily, until 18 Nov 2026, and offered 20M a month if we move to vector basemaps and show the CARTO logo linked to carto.com. Vector maps also need well under half the requests of raster for the same map.

What changed

• Keyed vector style: new route /basemap/positron.json serves CARTO's Positron vector style with our API key added to every tile, sprite and glyph URL. CARTO requires the key on all of these, but the published style doesn't include it. The key is still read only from AppConfig.CARTO_API_KEY (Secret Manager → Cloud Run), and the style is cached for 1 day.
• Select page: the raster TileLayer is replaced by a MapLibre vector layer inside Leaflet (assets/carto_basemap.js, which loads MapLibre only on this page). The map now has minZoom=2 and maxBounds, so we stop loading tiles for repeated world copies.
• Summary page: scatter_mapbox → scatter_map (MapLibre), pointing at the same style. This needs plotly 5.18.0 → 5.24.1; the lockfile change touches only that package.
• CARTO logo linked to carto.com on both maps (carto_logo_badge() in pages/lib/utils.py). The OSM/CARTO attribution is unchanged.
• Tests: unit tests for the style rewriting (tests/test_basemap.py), and pytest.ini so pages can be imported when running from tests/.

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