feat(cockpit): an application can add its own cockpit subjects; the Rail and Transit layers expose the read and hold APIs such a subject needs

GEV itself registers no new subject: with no provider, the Cockpit offers
aircraft, satellites and vessels as before, except that the most recently
selected of them now wins entry.

- services.cockpitSubjects: providers ({kind, layerId, entryFace, priority,
  isEntryAllowed, read, hold, release, hud}) are checked once by the
  coordinator; frames and HUD views on every update; a throwing provider
  ends its view or keeps the last HUD.
- Entry: the most recently selected subject wins, across all kinds.
- Camera: a frame may turn the ground clamp off, anchor exactly on the
  subject and update every frame.
- A generic HUD: kicker, title, cards, always-visible source rows, banner,
  a veil with light streaks (off under reduced motion) and a bottom
  progress line whose close ticks merge.
- Text comes from the provider, already in the page's language
  (./i18n/locale: getLocale, onLocaleChange).
- Rail and Transit read and hold APIs (getSelectedTrain/Vehicle,
  getCockpitSubject, setCockpitSubject, focusTrain/Vehicle); a held
  train's marker, card and route line are hidden, and its feed keeps
  polling while held.
- ./layers/rail/paths is exported.

scripts/package-boundaries.json

@@ -22,6 +22,9 @@
       "src/ui/vueRuntime.js",
       "src/ui/views/index.js",
       "src/ui/views/CockpitView.vue",
+      "src/ui/views/panels/CockpitProgress.vue",
+      "src/cockpitProgress.js",
+      "src/cockpitSubjectProviders.js",
       "src/ui/views/CommandDockView.vue",
       "src/ui/views/ContextView.vue",
       "src/ui/views/panels/RadioPanel.vue",
@@ -982,6 +985,8 @@
       "src/ui/cockpitInput.js",
       "src/data/inputOwnership.js",
       "src/ui/cockpitInstruments.js",
+      "src/cockpitSubjectProviders.js",
+      "src/cockpitProgress.js",
       "src/ui/cockpitLayout.js",
       "src/ui/cockpitPresentation.js",
       "src/ui/cockpitSignals.js",
@@ -1147,6 +1152,8 @@
       "src/ui/cockpitInput.js",
       "src/data/inputOwnership.js",
       "src/ui/cockpitInstruments.js",
+      "src/cockpitSubjectProviders.js",
+      "src/cockpitProgress.js",
       "src/ui/cockpitLayout.js",
       "src/ui/cockpitPresentation.js",
       "src/ui/cockpitSignals.js",
@@ -1329,6 +1336,7 @@
       "src/ui/styles/status.css",
       "src/ui/styles/cockpit.css",
       "src/ui/styles/cockpitBridge.css",
+      "src/ui/styles/cockpitSubject.css",
       "src/ui/styles/cockpitRadar.css",
       "src/ui/styles/overlays.css",
       "src/ui/styles/layers.css",
@@ -3066,6 +3074,8 @@
       "src/ui/displayPanelScroll.js",
       "src/ui/cockpitInput.js",
       "src/ui/cockpitInstruments.js",
+      "src/cockpitSubjectProviders.js",
+      "src/cockpitProgress.js",
       "src/ui/cockpitLayout.js",
       "src/ui/cockpitPresentation.js",
       "src/ui/cockpitSignals.js",
@@ -3253,6 +3263,7 @@
       "src/app/layers/rail.js",
       "src/data/railFeeds.js",
       "src/layers/rail/index.js",
+      "src/layers/rail/cockpitSubject.js",
       "src/layers/rail/source.js",
       "src/layers/rail/policy.js",
       "src/layers/rail/ingestion.js",
@@ -3279,6 +3290,7 @@
       "src/layers/transit/controls.js",
       "src/layers/transit/height.js",
       "src/layers/transit/index.js",
+      "src/layers/transit/cockpitSubject.js",
       "src/layers/transit/ingestion.js",
       "src/layers/transit/lifecycle.js",
       "src/layers/transit/policy.js",
@@ -4097,6 +4109,7 @@
       "src/app/layers/rail.js",
       "src/data/railFeeds.js",
       "src/layers/rail/index.js",
+      "src/layers/rail/cockpitSubject.js",
       "src/layers/rail/source.js",
       "src/layers/rail/policy.js",
       "src/layers/rail/ingestion.js",
@@ -4122,6 +4135,7 @@
       "src/layers/transit/controls.js",
       "src/layers/transit/height.js",
       "src/layers/transit/index.js",
+      "src/layers/transit/cockpitSubject.js",
       "src/layers/transit/ingestion.js",
       "src/layers/transit/lifecycle.js",
       "src/layers/transit/policy.js",
@@ -5020,6 +5034,7 @@
       "src/layers/transit/controls.js",
       "src/layers/transit/height.js",
       "src/layers/transit/index.js",
+      "src/layers/transit/cockpitSubject.js",
       "src/layers/transit/ingestion.js",
       "src/layers/transit/lifecycle.js",
       "src/layers/transit/movement.js",
@@ -5083,6 +5098,7 @@
       "src/layers/transit/controls.js",
       "src/layers/transit/height.js",
       "src/layers/transit/index.js",
+      "src/layers/transit/cockpitSubject.js",
       "src/layers/transit/ingestion.js",
       "src/layers/transit/lifecycle.js",
       "src/layers/transit/policy.js",
@@ -5704,5 +5720,33 @@
       "src/layers/wildlifeSightings/performance.js"
     ],
     "external": []
+  },
+  "i18n-locale": {
+    "exports": ["./i18n/locale"],
+    "modules": [
+      "src/i18n/hostLocale.js",
+      "src/i18n/marker.js",
+      "src/i18n/index.js",
+      "src/i18n/locale.js",
+      "src/i18n/locales/ar.json",
+      "src/i18n/locales/de.json",
+      "src/i18n/locales/es.json",
+      "src/i18n/locales/fr.json",
+      "src/i18n/locales/he.json",
+      "src/i18n/locales/it.json",
+      "src/i18n/locales/ja.json",
+      "src/i18n/locales/pt.json",
+      "src/i18n/locales/ru.json",
+      "src/i18n/locales/sv.json",
+      "src/i18n/locales/uk.json",
+      "src/i18n/locales/zh-CN.json",
+      "src/i18n/locales/zh-Hant.json"
+    ],
+    "external": []
+  },
+  "rail-paths": {
+    "exports": ["./layers/rail/paths"],
+    "modules": ["src/data/railPaths.js"],
+    "external": []
   }
 }