i18n: fix the LGTM review findings and tidy the branch texts

- i18n scanner: lastError sink, no false sinks on defaults and ternaries
- shared src/i18n/marker.js for modules that only mark strings
- wind field messages move to wind/fields.js; CITY_POIS imports from cityPois.js
- drop review IDs, change history and stale references from comments and docs

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

docs/CURRENT-STATE.md

@@ -3241,14 +3241,13 @@ Shipped locales: **en** (source and fallback), **es** and **ru**. The code lives
   value). English has no catalog; every other locale is
   `src/i18n/locales/<code>.json`, and a missing entry falls back to English.
 - **Locale choice.** `?lang=` → stored choice (`gev:locale:v1`) →
-  `navigator.languages` → English. `?lang=` is not stored: it applies while it
-  stays in the address, and the copied share link drops it, so a recipient keeps
-  their own language. The language picker in the bottom-right corner (a globe
-  button beside POWER UP, `src/ui/localePicker.js`) stores the choice, removes `?lang=` (keeps it only where storage is blocked) and reloads,
-  so nothing re-renders live; it asks first when the reload would lose work
-  (unsaved CCTV calibration, the open cockpit, Draw marks on the board,
-  imported map files, an active voice session — each registered through
-  `registerUnsavedWork`).
+  `navigator.languages` → English. `?lang=` is not stored, and share links drop
+  it, so a recipient keeps their own language. The globe picker in the
+  bottom-right corner (`src/ui/localePicker.js`) stores the choice, drops
+  `?lang=` (keeps it only when storage is blocked) and reloads. It asks first
+  when the reload would lose work registered with `registerUnsavedWork`:
+  unsaved keys or CCTV calibration, Draw marks, imported map files, the open
+  cockpit, a voice session.
 - **Gate.** `npm run i18n` (and `src/i18n/catalog.test.mjs` under `npm test`)
   extracts every message and fails on missing, empty, unused,
   placeholder-mismatched, still-English (plural forms included) or

docs/I18N.md

@@ -23,6 +23,8 @@ const FEED_STATE_LABELS = { loading: msg('LOADING'), stale: msg('STALE') };
 label.textContent = t(FEED_STATE_LABELS[state]);
 ```
 
+A module the server, tools or other portable code also imports must not load the catalogs: it imports `msg` from `src/i18n/marker.js`, which only marks the text, and the UI translates it with `t()` where it shows it. (Older modules keep a local `const msg = (text) => text`, which works the same.)
+
 `msg()` exists for two reasons. `npm run i18n` finds messages only as string literals inside `t(…)`, `tn(…)` and `msg(…)`, so `t(FEED_STATE_LABELS[state])` alone tells it nothing. And a `t()` call at module load runs before the page has picked its language, so it would freeze the English.
 
 ## Markup
@@ -42,7 +44,7 @@ label.textContent = t(FEED_STATE_LABELS[state]);
 - **Use `tn()` for counts**, not `count === 1 ? … : …`. Russian has three forms.
 - **Translate the label, not the value.** Layer ids, enums, share-link parameters, API fields, voice tool schemas and feed data (callsigns, vessel and place names) stay as they are; translate only the text shown for them.
 - **No `t()` at module top level.** Keep the English in `msg()` and call `t()` when rendering.
-- **Numbers and dates** go through `formatNumber`, `formatDate` and `formatRelativeTime` from `src/i18n/index.js`, which follow the active language.
+- **Numbers and dates** go through `formatNumber`, `formatDate`, `formatRelativeTime` and `formatUtcDayMonth` from `src/i18n/index.js`, which follow the active language.
 - **Identical English means identical translation,** unless you give it a context: `t('CLEAR', { context: 'action' })` (a button) is its own catalog entry, `action|CLEAR`, while `t('CLEAR')` (the sky) stays separate. English output is the same.
 - **Text that should stay English** (a brand, a code, a unit symbol) is simply not wrapped.
 
@@ -54,18 +56,18 @@ npm run i18n -- --missing ru     # the missing ru entries as JSON
 npm run i18n -- --prune          # drop entries whose English no longer exists
 ```
 
-Changing the English changes the key, so the old translation goes unused and the new text shows as missing. Add the translation to `src/i18n/locales/ru.json` (or ask a translator), prune, and run `npm test`, which runs the same check and fails until every language is complete.
+Changing the English changes the key: the old translation goes unused and the new text shows as missing. Add the translation to every `src/i18n/locales/<code>.json` (or ask a translator), prune, and run `npm test`; it fails until every language is complete.
 
 To see a language, open the app with `?lang=ru`, or use the language picker (the globe button in the bottom-right corner).
 
-An empty translation is reported, and so is one that is exactly the English ("Bloom" → "Bloom"), including any plural form left as the English: it 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`.
+An empty translation is reported, and so is one left as the English, plural forms included. When English is right on purpose (a code such as CRT, a product name), 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:
+`npm run i18n` and `npm test` fail on UI text that is not marked:
 
 - **Markup:** element text without `data-i18n`, and `title`, `aria-label` or `placeholder` without the matching `data-i18n-*`.
-- **Code:** string literals that reach the page without `t()`, `tn()` or `msg()`: assigned to `textContent`, `innerText`, `innerHTML`, `title`, `placeholder`; passed to `setAttribute('title' | 'aria-label' | 'aria-valuetext' | 'placeholder' | 'alt', …)`, `createTextNode`, `insertAdjacentHTML`, `showToast` (also `showToast?.(…)` and `this._showToast(…)`), `toast`, `setHint`, `announce`, `say`; assigned to a layer's `error`, `_error`, `loadingLabel`, `statusMessage` or `status` (`this._error = …`, `stats.loadingLabel = …`; a `const`/`let` local is not checked); or kept in `label:`, `title:`, `tooltip:`, `placeholder:`, `hint:`, `ariaLabel:`, `accessibilityLabel:`, `caption:`, `subtitle:`, `kicker:`, `emptyText:`, `blurb:`, `countLabel:`, `status:`, `loadingLabel:`, `statusMessage:` properties. Lower-case codes without spaces, such as `status: 'auth-failed'`, are not reported.
+- **Code:** string literals that reach the page without `t()`, `tn()` or `msg()`: assigned to `textContent`, `title` and the like; passed to `setAttribute('title' | 'aria-label' | …)`, `createTextNode`, `showToast` and other notice helpers; assigned to a layer's `error`, `lastError`, `loadingLabel`, `statusMessage` or `status` (a plain `error = …` too); or kept in `label:`, `title:`, `status:` and similar properties. Not reported: declarations (`let status = …`), default values, ternary branches and lower-case codes (`'auth-failed'`). The full list is `JS_SINKS` in `scripts/i18n.mjs`.
 
 Fix it by marking the text. When the text must stay as it is, say so where it lives:
 
@@ -82,6 +84,7 @@ Icons (`aria-hidden="true"`, Material Symbols), comments, CSS values and lowerca
 | File                            | What it holds                                                                  |
 | ------------------------------- | ------------------------------------------------------------------------------ |
 | `src/i18n/index.js`             | `t`, `tn`, `msg`, the Intl formatters, markup translation, switching language  |
+| `src/i18n/marker.js`            | `msg` alone, for modules the server or tools import (no catalogs)              |
 | `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                   |

docs/TRANSLATORS.md

@@ -32,7 +32,7 @@ npm run i18n -- --missing ru      # missing ru entries as JSON, ready to transla
 npm run i18n -- --prune           # drop entries the code no longer uses
 ```
 
-`npm test` runs the same check (`src/i18n/catalog.test.mjs`). It fails when a translation is missing or empty, when an entry is no longer used, when placeholders differ from the English, when a plural entry lacks a form, or when a translation, or any form of a plural entry, is still the English text. The `--missing` template is not a translation: its strings are empty and its plural forms are the English, so the check fails until every one is translated. If an entry is right as it is in English (a code such as HDG, a product name, a word spelled the same in your language), add it under your language code in `src/i18n/same-as-english.json`.
+`npm test` runs the same check. It fails on a missing, empty or unused entry, on placeholders that differ from the English, on a missing plural form, and on text or plural forms still in English. The `--missing` template fails until every entry is translated. If an entry is right in English (a code such as CRT, a product name), add it under your language code in `src/i18n/same-as-english.json`.
 
 Changing English text changes its key: the old translation becomes unused and the new text shows as missing. Translate it and prune.