feat(i18n): translate the whole interface

Mark every UI string the unmarked-text check reported (534) plus text it
cannot see (helpers, joined labels, runtime-built panels), and translate
the result to Spanish and Russian: 1,679 messages each.

- Kept on purpose, with the reason where the text lives: provider and
  product names, place and camera names, codes and units, dB values, the HUD
  terminal readouts, demo shot titles that saved projects look up by title,
  and text for AI tools and the voice model.
- Modules shared with the server or AI tools stay free of the i18n import
  (local msg); the wind reading and voice session stay English and are
  translated where the page shows them.
- npm test now runs the unmarked-text check.
- Fixes on the way: a duplicated radio privacy paragraph, the contact panel
  toggle saying Expand while open, the CSS filter mistaking & for CSS.

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

src/voice/gevActions.js

@@ -1642,15 +1642,20 @@ export async function controlCctv(dataManager, args = {}, styleManager = null) {
   throw new Error(`Unknown CCTV action: ${args.action || 'missing'}`);
 }
 
+// Labels are place names returned to the voice model as tool data.
 const RADIO_COUNTRY_CENTERS = new Map([
+  // i18n-ignore: place name in tool data
   ['us', { lat: 39.8, lon: -98.6, country: 'US', label: 'United States' }],
+  // i18n-ignore: place name in tool data
   ['usa', { lat: 39.8, lon: -98.6, country: 'US', label: 'United States' }],
   [
     'united states',
+    // i18n-ignore: place name in tool data
     { lat: 39.8, lon: -98.6, country: 'US', label: 'United States' },
   ],
   [
     'united states of america',
+    // i18n-ignore: place name in tool data
     { lat: 39.8, lon: -98.6, country: 'US', label: 'United States' },
   ],
 ]);
@@ -2251,6 +2256,7 @@ async function trackEntity(
           action: 'track_entity',
           kind: 'fire',
           layerId: 'local-firms',
+          // i18n-ignore: entity name in a tool result for the voice model
           label: strongest.label || 'Strongest fire',
           latitude: strongest.latitude,
           longitude: strongest.longitude,