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/keySetup.js

@@ -128,12 +128,17 @@ function updateCloudVoiceAuthControl(auth, busy = false) {
   const state = auth.querySelector('.key-setup-cloud-auth-state');
   const toggle = auth.querySelector('[data-cloud-voice-auth-toggle]');
   state.textContent =
-    mode === 'oauth' ? 'VOICE AUTH · CHATGPT OAUTH' : 'VOICE AUTH · API KEY';
-  toggle.textContent = mode === 'oauth' ? 'USE API KEY' : 'USE CHATGPT OAUTH';
+    mode === 'oauth'
+      ? t('VOICE AUTH · CHATGPT OAUTH')
+      : t('VOICE AUTH · API KEY');
+  toggle.textContent =
+    mode === 'oauth' ? t('USE API KEY') : t('USE CHATGPT OAUTH');
   toggle.title =
     mode === 'oauth'
-      ? 'Use OPENAI_API_KEY for the next cloud voice session'
-      : 'Use the signed-in local ChatGPT/Codex OAuth session for the next cloud voice session';
+      ? t('Use OPENAI_API_KEY for the next cloud voice session')
+      : t(
+          'Use the signed-in local ChatGPT/Codex OAuth session for the next cloud voice session',
+        );
   // Keep the control focusable while the delegated handler blocks repeats.
   toggle.setAttribute('aria-disabled', String(busy));
 }
@@ -153,21 +158,22 @@ function buildRow(documentRef, key) {
   led.className = 'key-setup-led';
   led.setAttribute('aria-hidden', 'true');
   const title = documentRef.createElement('strong');
-  title.textContent = key.title;
+  title.textContent = key.title; // i18n-ignore: provider product name
   const tier = documentRef.createElement('span');
   tier.className = 'key-setup-tier';
   tier.textContent = TIER_DOTS[key.tier] || '';
   tier.title =
     key.tier === 'metered'
-      ? 'Metered — a billing-enabled account'
-      : 'Free key — register, paste, done';
+      ? t('Metered — a billing-enabled account')
+      : t('Free key — register, paste, done');
   head.append(led, title, tier);
   if (key.clientExposed) {
     const exposed = documentRef.createElement('span');
     exposed.className = 'key-setup-exposed';
-    exposed.textContent = 'browser-side';
-    exposed.title =
-      'This key runs in the browser by design — restrict it at the provider (see SECURITY.md)';
+    exposed.textContent = t('browser-side');
+    exposed.title = t(
+      'This key runs in the browser by design — restrict it at the provider (see SECURITY.md)',
+    );
     head.append(exposed);
   }
   if (external) {
@@ -175,9 +181,10 @@ function buildRow(documentRef, key) {
     // facts this panel reports, never values it rewrites or deletes.
     const badge = documentRef.createElement('span');
     badge.className = 'key-setup-external';
-    badge.textContent = 'configured externally';
-    badge.title =
-      'Supplied by your environment, Keychain, or launcher — change it where it was set';
+    badge.textContent = t('configured externally');
+    badge.title = t(
+      'Supplied by your environment, Keychain, or launcher — change it where it was set',
+    );
     head.append(badge);
   }
   const get = documentRef.createElement('a');
@@ -185,7 +192,7 @@ function buildRow(documentRef, key) {
   get.href = key.getUrl;
   get.target = '_blank';
   get.rel = 'noopener noreferrer';
-  get.textContent = key.set ? 'MANAGE ↗' : 'GET KEY ↗';
+  get.textContent = key.set ? t('MANAGE ↗') : t('GET KEY ↗');
   head.append(get);
 
   const unlocks = documentRef.createElement('p');
@@ -206,8 +213,8 @@ function buildRow(documentRef, key) {
       input.dataset.envVar = envVar;
       input.setAttribute('aria-label', envVar);
       input.placeholder = key.set
-        ? `${envVar} saved — paste to replace`
-        : `paste ${envVar}`;
+        ? t('{envVar} saved — paste to replace', { envVar })
+        : t('paste {envVar}', { envVar });
       fields.append(input);
     }
     if (key.managed === 'file') {
@@ -328,7 +335,9 @@ export async function initKeySetup({
     if (disposed) return;
     status = nextStatus;
     chipLabel.textContent = keySetupChipLabel(status);
-    chip.title = `Project keys: ${keySetupChipLabel(status)}`;
+    chip.title = t('Project keys: {status}', {
+      status: keySetupChipLabel(status),
+    });
     chip.setAttribute('aria-label', chip.title);
     // Fully powered is the owner's clean screen: the chip retires. The dialog
     // stays reachable this session (and via ?setup=1) to swap or verify keys.