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/layers/recentImagery/index.js

@@ -33,6 +33,7 @@ import {
   validateBox,
   viewTooLargeMessage,
 } from './model.js';
+import { t } from '../../i18n/index.js';
 
 /**
  * Quiet time after the last arrow key before the focused day previews, so a
@@ -748,15 +749,21 @@ export function createRecentImageryLayer({
 
   function notes() {
     const out = [];
-    if (_truncated) out.push('Catalog truncated · a newer clear day may exist');
+    if (_truncated)
+      out.push(t('Catalog truncated · a newer clear day may exist'));
     for (const error of _catalogErrors) {
       const label = PRODUCTS[error.product]?.label || error.product;
-      out.push(`${label} catalog unavailable · ${error.message}`);
+      out.push(
+        t('{label} catalog unavailable · {detail}', {
+          label,
+          detail: error.message,
+        }),
+      );
     }
     const today = utcDay(now());
     const viirsToday = candidateFor(`VIIRS:${today}`);
     if (viirsToday?.availability === 'unknown' && _sources.viirs)
-      out.push('Daily overview for today may still be empty until the pass');
+      out.push(t('Daily overview for today may still be empty until the pass'));
     return out;
   }
 
@@ -767,7 +774,7 @@ export function createRecentImageryLayer({
       key: key || null,
       candidate: candidateFor(key),
       label: parsed
-        ? `${shortDay(parsed.day)} · ${PRODUCTS[parsed.product].name} · ${PRODUCTS[parsed.product].resolutionM} m`
+        ? `${shortDay(parsed.day)} · ${t(PRODUCTS[parsed.product].name)} · ${PRODUCTS[parsed.product].resolutionM} m`
         : null,
       sourceOff,
       drapable: drapable(candidateFor(key)),
@@ -1329,17 +1336,18 @@ export function createRecentImageryLayer({
         chips: [
           {
             id: 'hls',
-            label: 'MORE DETAIL · 30 m',
+            label: t('MORE DETAIL · 30 m'),
             active: _sources.hls,
-            title: 'Sentinel-2 and Landsat via HLS, 30 m, every 2–6 days',
+            title: t('Sentinel-2 and Landsat via HLS, 30 m, every 2–6 days'),
             params: { hls: !_sources.hls },
           },
           {
             id: 'viirs',
-            label: 'DAILY OVERVIEW · 250 m',
+            label: t('DAILY OVERVIEW · 250 m'),
             active: _sources.viirs,
-            title:
+            title: t(
               'VIIRS daily mosaic, 250 m, follows broad changes; little detail under 25 km',
+            ),
             params: { viirs: !_sources.viirs },
           },
         ],