Add progressive web app companion for cross-platform access

Vite + TypeScript PWA that mirrors the Android app's core features:
- Pre-processed shelter data (build-time UTM33N→WGS84 conversion)
- Leaflet map with shelter markers, user location, and offline tiles
- Canvas compass arrow (ported from DirectionArrowView.kt)
- IndexedDB shelter cache with 7-day staleness check
- Service worker with CacheFirst tiles and precached app shell
- i18n for en, nb, nn (ported from Android strings.xml)
- iOS/Android compass handling with low-pass filter
- Respects user map interaction (no auto-snap on pan/zoom)
- Build revision cache-breaker for reliable SW updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pwa/node_modules/ajv/lib/vocabularies/validation/limitNumber.ts

@@ -0,0 +1,42 @@
+import type {CodeKeywordDefinition, ErrorObject, KeywordErrorDefinition} from "../../types"
+import type {KeywordCxt} from "../../compile/validate"
+import {_, str, operators, Code} from "../../compile/codegen"
+
+const ops = operators
+
+type Kwd = "maximum" | "minimum" | "exclusiveMaximum" | "exclusiveMinimum"
+
+type Comparison = "<=" | ">=" | "<" | ">"
+
+const KWDs: {[K in Kwd]: {okStr: Comparison; ok: Code; fail: Code}} = {
+  maximum: {okStr: "<=", ok: ops.LTE, fail: ops.GT},
+  minimum: {okStr: ">=", ok: ops.GTE, fail: ops.LT},
+  exclusiveMaximum: {okStr: "<", ok: ops.LT, fail: ops.GTE},
+  exclusiveMinimum: {okStr: ">", ok: ops.GT, fail: ops.LTE},
+}
+
+export type LimitNumberError = ErrorObject<
+  Kwd,
+  {limit: number; comparison: Comparison},
+  number | {$data: string}
+>
+
+const error: KeywordErrorDefinition = {
+  message: ({keyword, schemaCode}) => str`must be ${KWDs[keyword as Kwd].okStr} ${schemaCode}`,
+  params: ({keyword, schemaCode}) =>
+    _`{comparison: ${KWDs[keyword as Kwd].okStr}, limit: ${schemaCode}}`,
+}
+
+const def: CodeKeywordDefinition = {
+  keyword: Object.keys(KWDs),
+  type: "number",
+  schemaType: "number",
+  $data: true,
+  error,
+  code(cxt: KeywordCxt) {
+    const {keyword, data, schemaCode} = cxt
+    cxt.fail$data(_`${data} ${KWDs[keyword as Kwd].fail} ${schemaCode} || isNaN(${data})`)
+  },
+}
+
+export default def