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/data/satelliteClass.js

@@ -26,47 +26,47 @@ import { t, msg } from '../i18n/index.js';
  */
 export const SATELLITE_CLASSES = Object.freeze({
   station: Object.freeze({
-    label: 'STATION',
+    label: 'STATION', // i18n-ignore: English token; shown through CLASS_DISPLAY_KEYS
     // Warm white — "crewed", and the brightest class in the sky. Deliberately
     // NOT amber: 40-48deg amber is the app's known-military convention
     // (flights.js MIL_TINT / militaryFlights.js MIL_ICON_COLOR) and must not
     // leak into another domain. Slightly warm so it also separates from the
     // pure white the civilian air fleet draws in.
     color: '#fff6e5',
-    blurb: 'Crewed stations and their visiting vehicles',
+    blurb: 'Crewed stations and their visiting vehicles', // i18n-ignore: shown through CLASS_DISPLAY_KEYS
   }),
   nav: Object.freeze({
-    label: 'NAV',
+    label: 'NAV', // i18n-ignore: English token; shown through CLASS_DISPLAY_KEYS
     // Cyan — the strongest accent goes to the class users actually name
     // ("how many GPS satellites are up?"). Takes over the slot the catch-all
     // VISUAL group used to occupy, so this adds no new hue to the app.
     color: '#4fd8ff',
-    blurb: 'GNSS navigation — GPS, GLONASS, Galileo',
+    blurb: 'GNSS navigation — GPS, GLONASS, Galileo', // i18n-ignore: shown through CLASS_DISPLAY_KEYS
   }),
   geo: Object.freeze({
-    label: 'GEO',
+    label: 'GEO', // i18n-ignore: English token; shown through CLASS_DISPLAY_KEYS
     // Violet, unchanged. Already the app's "space" semantic (the detection
     // overlay paints the SAT tier #bda4ff), and the geostationary belt draws
     // as one clean equatorial ring at globe scale.
     color: '#c89bff',
-    blurb: 'Geostationary belt — comms and weather, fixed over the equator',
+    blurb: 'Geostationary belt — comms and weather, fixed over the equator', // i18n-ignore: shown through CLASS_DISPLAY_KEYS
   }),
   visual: Object.freeze({
-    label: 'VISUAL',
+    label: 'VISUAL', // i18n-ignore: English token; shown through CLASS_DISPLAY_KEYS
     // Muted blue-gray. This is the catch-all bucket, so it gives up the bright
     // cyan it used to hold and recedes behind the three classes that mean
     // something. Still well clear of the dense shell by luminance.
     color: '#9fb3c4',
-    blurb: 'Brightest naked-eye objects — CelesTrak visual group',
+    blurb: 'Brightest naked-eye objects — CelesTrak visual group', // i18n-ignore: shown through CLASS_DISPLAY_KEYS
   }),
   comms: Object.freeze({
-    label: 'COMMS',
+    label: 'COMMS', // i18n-ignore: English token; shown through CLASS_DISPLAY_KEYS
     // Dim slate — thousands of these appear in DENSE mode. They must read as
     // texture behind the core catalog, never compete with it. Rec.601 luma
     // ~0.40 against VISUAL's ~0.69 keeps the two separable even when the
     // NVG/FLIR shaders collapse the scene to a single channel.
     color: '#54697f',
-    blurb: 'Broadband constellation shell — shown only in DENSE mode',
+    blurb: 'Broadband constellation shell — shown only in DENSE mode', // i18n-ignore: shown through CLASS_DISPLAY_KEYS
   }),
 });