feat(street-level): one colour per imagery source

As more sources arrive, each one reads the same everywhere it appears: its
PROVIDERS chip, coverage lines, overview points, image cones and a single
legend swatch. The palette lives in one place, PROVIDER_COLORS in
src/layers/streetLevel/policy.js: Mapillary green (#05cb63), Panoramax
purple, Google Street View blue.

Mapillary drops its age dimming and magenta panoramas: lines and overview
points are Mapillary green, cones are green too and 360° images keep their
ring shape; the 360°/FLAT filter still separates them, and the selected
sequence stays GEV cyan.

The provider contract loses `legend`: `colors.coverage` is the source's one
colour, and the core composes the legend as one swatch per active source
(its name, its colour) followed by Selected. The chip group takes an
optional per-chip colour as a `--chip-color` CSS variable, written only
when it changes; Street Level chips show it as a swatch dot and, while on,
as the chip's border, text and a faint fill.

The feature gate checks the legend has one swatch per source plus Selected
and that the Mapillary chip carries #05cb63.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/layers/streetLevel/policy.js

@@ -4,6 +4,17 @@ export const STREET_LEVEL_LAYER_ID = 'street-level';
 /** Pick id of the viewer position marker; the core owns it, not a provider. */
 export const POSITION_PICK_ID = 'sl:pos';
 
+/**
+ * One colour per imagery source, used everywhere that source appears: its
+ * chip, coverage lines, overview points, image cones and legend swatch.
+ * Registered providers take their entry from here; a new source adds one.
+ */
+export const PROVIDER_COLORS = Object.freeze({
+  mapillary: '#05cb63',
+  panoramax: '#a66bff',
+  'google-street-view': '#4285f4',
+});
+
 /** Colours every provider shares: the selection highlight and the marker. */
 export const COLORS = Object.freeze({
   selected: '#00d4ff',