feat(rail): add a Rail layer with keyless live trains

Live trains from 30 keyless operator feeds: GPS positions from 29 and
Irish Rail's station reports, shown as the operators publish them. 28
work out of the box; Renfe long and medium distance and KTMB appear once
their pack is built, because their vehicles name no route.

Packs are opt-in (scripts/build-rail-paths.mjs): the operator's own
route lines, stop names, next stops and trip-update delays for live
trains. Nothing downloads when the app starts, no train is placed from a
timetable, and no request carries a deployer's key.

src/i18n/locales/he.json

@@ -3357,6 +3357,21 @@
   "Reported voyage": "הפלגה שדווחה",
   "REPORTED VOYAGE": "הפלגה שדווחה",
   "1 min/s": "דקה/שנ׳",
+  "Rail": "רכבות",
+  "Urban rail": "רכבת עירונית",
+  "Local rail": "רכבת מקומית",
+  "Regional rail": "רכבת אזורית",
+  "National rail": "רכבת ארצית",
+  "International rail": "רכבת בינלאומית",
+  "Hide {category}": "הסתרת {category}",
+  "Show {category}": "הצגת {category}",
+  "Live GPS": "GPS חי",
+  "Estimated from station reports": "משוער לפי דיווחי תחנות",
+  "To {headsign}": "אל {headsign}",
+  "Next {stop} {time} {relative}": "התחנה הבאה {stop} {time} {relative}",
+  "Prev {stop} {time} {relative}": "התחנה הקודמת {stop} {time} {relative}",
+  "(+{minutes} min late)": "(+{minutes} דק׳ איחור)",
+  "Exit cockpit to fly to a train": "צא מתא הטייס כדי לטוס לרכבת",
   "Photo © {photographer}": "צילום © {photographer}",
   "1 h/s": "שעה/שנ׳",
   "1 d/s": "יום/שנ׳",