fix(i18n): Spanish review fixes; report translations left in English

A screenshot review of the Spanish UI found:

- Text left in English. Catalog entries copied from English (Bloom,
  Cyber, Pin, NEWS, SITE, ON/OFF, RANGE, PITCH, HGT…) and the radio
  music genres, which never went through t(). The genres are translated
  in es and ru now.
- Wording: gender agreement, calques of the English, hints that name
  buttons that do not exist, and one concept worded two ways.
- Layout: the DESACTIVADO pill squeezed layer names until words broke
  mid-word; the scene and camera selects showed one word; a collapsed
  rail title pushed its button out of the card; the image slot line and
  a comparison readout were cut or split.

The layout fixes are scoped to languages other than English, so English
stays pixel-identical. Visual-style slider values now use the locale's
decimal separator (0,85).

npm run i18n now reports a translation that is identical to the
English, unless src/i18n/same-as-english.json lists it for that language
(codes, product names, words spelled the same).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/I18N.md

@@ -58,6 +58,8 @@ Changing the English changes the key, so the old translation goes unused and the
 
 To see a language, open the app with `?lang=ru`, or use the language switch in the Visual Presets dock.
 
+A translation that is exactly the English ("Bloom" → "Bloom") is reported as still English. When it is right on purpose, such as a code (HDG, CRT), a product name or a word spelled the same in that language, list it under the language in `src/i18n/same-as-english.json`.
+
 ## Text the check reports as unmarked
 
 `npm run i18n` also lists UI text that is not marked at all, and fails while there is any; `npm test` runs the same check:
@@ -77,10 +79,11 @@ Icons (`aria-hidden="true"`, Material Symbols), comments, CSS values and lowerca
 
 ## Where things live
 
-| File                           | What it holds                                                                  |
-| ------------------------------ | ------------------------------------------------------------------------------ |
-| `src/i18n/index.js`            | `t`, `tn`, `msg`, the Intl formatters, markup translation, switching language  |
-| `src/i18n/locale.js`           | shipped languages, their names, choosing the language at boot                  |
-| `src/i18n/locales/<code>.json` | one catalog per language, keyed by English text                                |
-| `scripts/i18n.mjs`             | `npm run i18n`: extracts messages, checks the catalogs, finds unmarked UI text |
-| `src/i18n/catalog.test.mjs`    | runs that check under `npm test`                                               |
+| File                            | What it holds                                                                  |
+| ------------------------------- | ------------------------------------------------------------------------------ |
+| `src/i18n/index.js`             | `t`, `tn`, `msg`, the Intl formatters, markup translation, switching language  |
+| `src/i18n/locale.js`            | shipped languages, their names, choosing the language at boot                  |
+| `src/i18n/locales/<code>.json`  | one catalog per language, keyed by English text                                |
+| `src/i18n/same-as-english.json` | per language, the entries that stay as in English on purpose                   |
+| `scripts/i18n.mjs`              | `npm run i18n`: extracts messages, checks the catalogs, finds unmarked UI text |
+| `src/i18n/catalog.test.mjs`     | runs that check under `npm test`                                               |