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/ui/scenePresentation.js

@@ -1,4 +1,26 @@
 /** Scene panel elements and text-only project presentation. */
+import { msg, t } from '../i18n/index.js';
+
+// Labels for what a shot stores; anything else shows as stored. Style names
+// match STYLE_STATUS_LABELS in visualPresets.js, which this package cannot
+// import (it pulls in the shaders).
+const STYLE_LABELS = Object.freeze({
+  normal: msg('NORMAL'),
+  retro: msg('CRT'),
+  surveillance: msg('NVG'),
+  thermal: msg('FLIR'),
+  anime: msg('ANIME'),
+  noir: msg('NOIR'),
+  snow: msg('SNOW'),
+});
+
+const DETECTION_MODE_LABELS = Object.freeze({
+  OFF: msg('OFF'),
+  SPARSE: msg('SPARSE'),
+  BALANCED: msg('BALANCED'),
+  DENSE: msg('DENSE'),
+});
+
 export function sceneElements(root = document) {
   const ids = {
     panel: 'scene-panel',
@@ -47,7 +69,9 @@ export function renderSceneShots(
   if (!scene || scene.shots.length === 0) {
     const empty = document.createElement('div');
     empty.className = 'scene-shot-empty';
-    empty.textContent = 'No shots yet. Use CAPTURE SHOT to save current look.';
+    empty.textContent = t(
+      'No shots yet. Use CAPTURE SHOT to save current look.',
+    );
     element.appendChild(empty);
     return;
   }
@@ -61,14 +85,14 @@ export function renderSceneShots(
     const label = document.createElement('div');
     label.className = 'scene-shot-label';
     label.textContent = shot.title;
-    label.title = 'Double-click to rename';
+    label.title = t('Double-click to rename');
     listen(label, 'click', () => select(shot.id));
     listen(label, 'dblclick', () => {
       if (label.children.length) return;
       const input = document.createElement('input');
       input.type = 'text';
       input.className = 'scene-shot-rename';
-      input.setAttribute('aria-label', 'Shot name');
+      input.setAttribute('aria-label', t('Shot name'));
       input.value = shot.title;
       let finished = false;
       const finish = (save) => {
@@ -96,11 +120,11 @@ export function renderSceneShots(
     actions.className = 'scene-shot-actions';
     const loadButton = document.createElement('button');
     loadButton.className = 'scene-shot-btn';
-    loadButton.textContent = 'LOAD';
+    loadButton.textContent = t('LOAD');
     listen(loadButton, 'click', () => load(scene.id, shot.id));
     const deleteButton = document.createElement('button');
     deleteButton.className = 'scene-shot-btn scene-shot-danger';
-    deleteButton.textContent = 'DEL';
+    deleteButton.textContent = t('DEL');
     listen(deleteButton, 'click', () => remove(scene.id, shot.id));
     actions.appendChild(loadButton);
     actions.appendChild(deleteButton);
@@ -110,7 +134,13 @@ export function renderSceneShots(
     meta.className = 'scene-shot-meta';
     const mode = shot.visual?.detection?.mode || 'OFF';
     const style = shot.visual?.style || 'normal';
-    meta.textContent = `${style.toUpperCase()} · ${mode} · ${shot.durationSec.toFixed(1)}s + ${shot.holdSec.toFixed(1)}s`;
+    const styleLabel = STYLE_LABELS[style]
+      ? t(STYLE_LABELS[style])
+      : style.toUpperCase();
+    const modeLabel = DETECTION_MODE_LABELS[mode]
+      ? t(DETECTION_MODE_LABELS[mode])
+      : mode;
+    meta.textContent = `${styleLabel} · ${modeLabel} · ${shot.durationSec.toFixed(1)}s + ${shot.holdSec.toFixed(1)}s`;
     row.appendChild(top);
     row.appendChild(meta);
     element.appendChild(row);