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]>

docs/translations/ru.md

@@ -21,7 +21,7 @@ A `tn()` entry needs four forms. `Intl.PluralRules('ru')` picks:
 | `many`  | 0, 5–20, 25–30, 111–114… | 5 камер    |
 | `other` | fractions: 1.5, 2.25…    | 1,5 камеры |
 
-When a word next to a number cannot agree in every form, move the number after a colon instead: «доступно {bikes}», «ответов: {responses}».
+When a word next to a number cannot agree in every form, move the number after a colon instead: «доступно {bikes}», «ответов: {responses}». The same trick keeps place names and tool names out of a preposition's case: «откуда: {origin}», «Активно: {name}».
 
 ## Glossary
 
@@ -53,4 +53,9 @@ When a word next to a number cannot agree in every form, move the number after a
 | HDG / BRG / CRS / FOV / DEST / SPD / RANGE | КУРС / ПЕЛ. / ПУТЬ / ОБЗОР / НАЗН. / СКОР / ДАЛЬН. |
 | PREV / NEXT                                | ПРЕД. / СЛЕД.                                      |
 | Previous / Next (button text)              | Назад / Далее                                      |
+| anchor / data pack / bundle (scene)        | якорь / пакет данных / архив                       |
+| basemap / box (Recent Imagery area)        | подложка / область                                 |
+| camera move                                | перелёт                                            |
+| SIG / NEWS / LOCAL (briefing tabs)         | СИГН. / НОВОСТИ / МЕСТН.                           |
+| compass points (N, NNE, …)                 | С, ССВ, …                                          |
 | L / R (relative bearing)                   | Л / П                                              |