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]>

src/i18n/marker.js

@@ -0,0 +1,7 @@
+// msg() for modules the server, tools or other portable code also import:
+// marks English that stays in data for `npm run i18n`, without loading the
+// catalogs (src/i18n/index.js). The UI shows it later through t().
+// Browser-only modules import msg from src/i18n/index.js instead.
+
+/** Mark English text that is stored in data and translated later by t(). */
+export const msg = (text) => text;