feat(street-level): "show me X on Street View" action, street_level view field and sl= links

show_street_level (voice and typed) flies to a place and opens its nearest
street-level photo from Google Street View, Mapillary, KartaView or
Panoramax; Street View switches to Google 3D first. The view model gains a
street_level field, share links carry sl=<source>,<lat>,<lon>, and
show_in_gods_eye_view can open a photo. A plain sl=google link only arms the
point and waits for OPEN, so it never bills a key without a click.

Embed pages show an open photo in an overlay that Esc closes. On-screen
strings are translated into es, ru, zh-CN and zh-Hant. Covered by unit tests
and three new steps in the Street Level browser suite.

scripts/voice-bench/phrases.mjs

@@ -35,6 +35,14 @@ export const CORE_PHRASES = Object.freeze([
   { phrase: 'Show me the whole earth', expect: 'zoom_to_globe' },
   { phrase: 'Frame the aircraft near us from overhead', expect: 'frame_overhead', typedArgs: [where('frame_overhead', (a) => a.target === 'flights')] },
 
+  // — street-level photos: one composite action, never fly + basemap —
+  { phrase: 'Show me the Eiffel Tower on Street View', expect: 'show_street_level', typedArgs: [where('show_street_level', (a) => a.provider === 'google' && /eiffel/i.test(a.query || ''))] },
+  { phrase: 'Street view of 10th Street in Sacramento', expect: 'show_street_level', typedArgs: [where('show_street_level', (a) => a.provider === 'google')] },
+  { phrase: 'Show me Times Square on Mapillary', expect: 'show_street_level', typedArgs: [where('show_street_level', (a) => a.provider === 'mapillary')] },
+  { phrase: 'Switch to Google Street View', expect: 'show_street_level', typedArgs: [where('show_street_level', (a) => a.provider === 'google' && !a.query)] },
+  { phrase: 'Show me the Eiffel Tower', expect: 'fly_to_location' },
+  { phrase: 'Turn on street level', expect: 'set_layer_visibility', typedArgs: [where('set_layer_visibility', (a) => a.layerId === 'street-level' && a.enabled === true)] },
+
   // — the satellites trap: data layer, never basemap —
   { phrase: 'Show me the satellites', expect: { oneOf: ['set_layer_visibility', 'frame_overhead'] } },
   { phrase: 'Turn off the satellites', expect: 'set_layer_visibility', args: { layerId: 'satellites' }, typedArgs: [where('set_layer_visibility', (a) => a.layerId === 'satellites' && a.enabled === false)] },