Add ADS-B, AIS, and ALPR map layers with live CoT streaming.

Ingest aircraft and vessel tracks via OSINT feeds and tactical CoT, expose viewport-filtered SSE to the map, and add an OSM ALPR layer with tiled caching and performant marker sync.

test/nuxt/useCotStream.spec.js

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+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+import { useCotLayers } from '../../app/composables/useCotLayers.js'
+
+describe('useCotLayers', () => {
+  beforeEach(() => {
+    localStorage.clear()
+  })
+
+  afterEach(() => {
+    localStorage.clear()
+  })
+
+  it('defaults all layers on', () => {
+    const { layers, layerQuery } = useCotLayers()
+    expect(layers.value).toEqual({ air: true, surface: true, ground: true })
+    expect(layerQuery.value).toBe('air,surface,ground')
+  })
+
+  it('toggles layers and persists to localStorage', () => {
+    const { layers, toggleLayer, layerQuery } = useCotLayers()
+    toggleLayer('air')
+    expect(layers.value.air).toBe(false)
+    expect(layerQuery.value).toBe('surface,ground')
+    const stored = JSON.parse(localStorage.getItem('kestrel-cot-layers'))
+    expect(stored.air).toBe(false)
+  })
+})
+
+describe('useCotStream helpers', () => {
+  it('layer query none when all off', () => {
+    localStorage.clear()
+    const { toggleLayer, layerQuery } = useCotLayers()
+    toggleLayer('air')
+    toggleLayer('surface')
+    toggleLayer('ground')
+    expect(layerQuery.value).toBe('none')
+  })
+})