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/side-channel-list/.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+indent_size = 2
+trim_trailing_whitespace = true

pwa/node_modules/side-channel-list/.eslintrc

@@ -0,0 +1,11 @@
+{
+	"root": true,
+
+	"extends": "@ljharb",
+
+	"rules": {
+		"max-lines-per-function": 0,
+		"multiline-comment-style": 1,
+		"new-cap": [2, { "capIsNewExceptions": ["GetIntrinsic"] }],
+	},
+}

pwa/node_modules/side-channel-list/.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [ljharb]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: npm/side-channel-list
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

pwa/node_modules/side-channel-list/.nycrc

@@ -0,0 +1,13 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"lines": 86,
+	"statements": 85.93,
+	"functions": 82.43,
+	"branches": 76.06,
+	"exclude": [
+		"coverage",
+		"test"
+	]
+}

pwa/node_modules/side-channel-list/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## v1.0.0 - 2024-12-10
+
+### Commits
+
+- Initial implementation, tests, readme, types [`5d6baee`](https://github.com/ljharb/side-channel-list/commit/5d6baee5c9054a1238007f5a1dfc109a7a816251)
+- Initial commit [`3ae784c`](https://github.com/ljharb/side-channel-list/commit/3ae784c63a47895fbaeed2a91ab54a8029a7a100)
+- npm init [`07055a4`](https://github.com/ljharb/side-channel-list/commit/07055a4d139895565b199dba5fe2479c1a1b9e28)
+- Only apps should have lockfiles [`9573058`](https://github.com/ljharb/side-channel-list/commit/9573058a47494e2d68f8c6c77b5d7fbe441949c1)

pwa/node_modules/side-channel-list/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Jordan Harband
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

pwa/node_modules/side-channel-list/README.md

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+# side-channel-list <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
+
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
+Store information about any JS value in a side channel, using a linked list.
+
+Warning: this implementation will leak memory until you `delete` the `key`.
+Use [`side-channel`](https://npmjs.com/side-channel) for the best available strategy.
+
+## Getting started
+
+```sh
+npm install --save side-channel-list
+```
+
+## Usage/Examples
+
+```js
+const assert = require('assert');
+const getSideChannelList = require('side-channel-list');
+
+const channel = getSideChannelList();
+
+const key = {};
+assert.equal(channel.has(key), false);
+assert.throws(() => channel.assert(key), TypeError);
+
+channel.set(key, 42);
+
+channel.assert(key); // does not throw
+assert.equal(channel.has(key), true);
+assert.equal(channel.get(key), 42);
+
+channel.delete(key);
+assert.equal(channel.has(key), false);
+assert.throws(() => channel.assert(key), TypeError);
+```
+
+## Tests
+
+Clone the repo, `npm install`, and run `npm test`
+
+[package-url]: https://npmjs.org/package/side-channel-list
+[npm-version-svg]: https://versionbadg.es/ljharb/side-channel-list.svg
+[deps-svg]: https://david-dm.org/ljharb/side-channel-list.svg
+[deps-url]: https://david-dm.org/ljharb/side-channel-list
+[dev-deps-svg]: https://david-dm.org/ljharb/side-channel-list/dev-status.svg
+[dev-deps-url]: https://david-dm.org/ljharb/side-channel-list#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/side-channel-list.png?downloads=true&stars=true
+[license-image]: https://img.shields.io/npm/l/side-channel-list.svg
+[license-url]: LICENSE
+[downloads-image]: https://img.shields.io/npm/dm/side-channel-list.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=side-channel-list
+[codecov-image]: https://codecov.io/gh/ljharb/side-channel-list/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/ljharb/side-channel-list/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/side-channel-list
+[actions-url]: https://github.com/ljharb/side-channel-list/actions

pwa/node_modules/side-channel-list/index.d.ts

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+declare namespace getSideChannelList {
+	type Channel<K, V> = {
+		assert: (key: K) => void;
+		has: (key: K) => boolean;
+		get: (key: K) => V | undefined;
+		set: (key: K, value: V) => void;
+		delete: (key: K) => boolean;
+	};
+}
+
+declare function getSideChannelList<V, K>(): getSideChannelList.Channel<K, V>;
+
+export = getSideChannelList;

pwa/node_modules/side-channel-list/index.js

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+'use strict';
+
+var inspect = require('object-inspect');
+
+var $TypeError = require('es-errors/type');
+
+/*
+* This function traverses the list returning the node corresponding to the given key.
+*
+* That node is also moved to the head of the list, so that if it's accessed again we don't need to traverse the whole list.
+* By doing so, all the recently used nodes can be accessed relatively quickly.
+*/
+/** @type {import('./list.d.ts').listGetNode} */
+// eslint-disable-next-line consistent-return
+var listGetNode = function (list, key, isDelete) {
+	/** @type {typeof list | NonNullable<(typeof list)['next']>} */
+	var prev = list;
+	/** @type {(typeof list)['next']} */
+	var curr;
+	// eslint-disable-next-line eqeqeq
+	for (; (curr = prev.next) != null; prev = curr) {
+		if (curr.key === key) {
+			prev.next = curr.next;
+			if (!isDelete) {
+				// eslint-disable-next-line no-extra-parens
+				curr.next = /** @type {NonNullable<typeof list.next>} */ (list.next);
+				list.next = curr; // eslint-disable-line no-param-reassign
+			}
+			return curr;
+		}
+	}
+};
+
+/** @type {import('./list.d.ts').listGet} */
+var listGet = function (objects, key) {
+	if (!objects) {
+		return void undefined;
+	}
+	var node = listGetNode(objects, key);
+	return node && node.value;
+};
+/** @type {import('./list.d.ts').listSet} */
+var listSet = function (objects, key, value) {
+	var node = listGetNode(objects, key);
+	if (node) {
+		node.value = value;
+	} else {
+		// Prepend the new node to the beginning of the list
+		objects.next = /** @type {import('./list.d.ts').ListNode<typeof value, typeof key>} */ ({ // eslint-disable-line no-param-reassign, no-extra-parens
+			key: key,
+			next: objects.next,
+			value: value
+		});
+	}
+};
+/** @type {import('./list.d.ts').listHas} */
+var listHas = function (objects, key) {
+	if (!objects) {
+		return false;
+	}
+	return !!listGetNode(objects, key);
+};
+/** @type {import('./list.d.ts').listDelete} */
+// eslint-disable-next-line consistent-return
+var listDelete = function (objects, key) {
+	if (objects) {
+		return listGetNode(objects, key, true);
+	}
+};
+
+/** @type {import('.')} */
+module.exports = function getSideChannelList() {
+	/** @typedef {ReturnType<typeof getSideChannelList>} Channel */
+	/** @typedef {Parameters<Channel['get']>[0]} K */
+	/** @typedef {Parameters<Channel['set']>[1]} V */
+
+	/** @type {import('./list.d.ts').RootNode<V, K> | undefined} */ var $o;
+
+	/** @type {Channel} */
+	var channel = {
+		assert: function (key) {
+			if (!channel.has(key)) {
+				throw new $TypeError('Side channel does not contain ' + inspect(key));
+			}
+		},
+		'delete': function (key) {
+			var root = $o && $o.next;
+			var deletedNode = listDelete($o, key);
+			if (deletedNode && root && root === deletedNode) {
+				$o = void undefined;
+			}
+			return !!deletedNode;
+		},
+		get: function (key) {
+			return listGet($o, key);
+		},
+		has: function (key) {
+			return listHas($o, key);
+		},
+		set: function (key, value) {
+			if (!$o) {
+				// Initialize the linked list as an empty node, so that we don't have to special-case handling of the first node: we can always refer to it as (previous node).next, instead of something like (list).head
+				$o = {
+					next: void undefined
+				};
+			}
+			// eslint-disable-next-line no-extra-parens
+			listSet(/** @type {NonNullable<typeof $o>} */ ($o), key, value);
+		}
+	};
+	// @ts-expect-error TODO: figure out why this is erroring
+	return channel;
+};

pwa/node_modules/side-channel-list/list.d.ts

@@ -0,0 +1,14 @@
+type ListNode<T, K> = {
+	key: K;
+	next: undefined | ListNode<T, K>;
+	value: T;
+};
+type RootNode<T, K> = {
+	next: undefined | ListNode<T, K>;
+};
+
+export function listGetNode<T, K>(list: RootNode<T, K>, key: ListNode<T, K>['key'], isDelete?: boolean): ListNode<T, K> | undefined;
+export function listGet<T, K>(objects: undefined | RootNode<T, K>, key: ListNode<T, K>['key']): T | undefined;
+export function listSet<T, K>(objects: RootNode<T, K>, key: ListNode<T, K>['key'], value: T): void;
+export function listHas<T, K>(objects: undefined | RootNode<T, K>, key: ListNode<T, K>['key']): boolean;
+export function listDelete<T, K>(objects: undefined | RootNode<T, K>, key: ListNode<T, K>['key']): ListNode<T, K> | undefined;

pwa/node_modules/side-channel-list/package.json

@@ -0,0 +1,77 @@
+{
+	"name": "side-channel-list",
+	"version": "1.0.0",
+	"description": "Store information about any JS value in a side channel, using a linked list",
+	"main": "index.js",
+	"exports": {
+		".": "./index.js",
+		"./package.json": "./package.json"
+	},
+	"types": "./index.d.ts",
+	"scripts": {
+		"prepack": "npmignore --auto --commentLines=autogenerated",
+		"prepublishOnly": "safe-publish-latest",
+		"prepublish": "not-in-publish || npm run prepublishOnly",
+		"prelint": "evalmd README.md && eclint check $(git ls-files | xargs find 2> /dev/null | grep -vE 'node_modules|\\.git')",
+		"lint": "eslint --ext=js,mjs .",
+		"postlint": "tsc -p . && attw -P",
+		"pretest": "npm run lint",
+		"tests-only": "nyc tape 'test/**/*.js'",
+		"test": "npm run tests-only",
+		"posttest": "npx npm@'>= 10.2' audit --production",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
+	},
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/ljharb/side-channel-list.git"
+	},
+	"keywords": [],
+	"author": "Jordan Harband <ljharb@gmail.com>",
+	"funding": {
+		"url": "https://github.com/sponsors/ljharb"
+	},
+	"license": "MIT",
+	"bugs": {
+		"url": "https://github.com/ljharb/side-channel-list/issues"
+	},
+	"homepage": "https://github.com/ljharb/side-channel-list#readme",
+	"dependencies": {
+		"es-errors": "^1.3.0",
+		"object-inspect": "^1.13.3"
+	},
+	"devDependencies": {
+		"@arethetypeswrong/cli": "^0.17.1",
+		"@ljharb/eslint-config": "^21.1.1",
+		"@ljharb/tsconfig": "^0.2.2",
+		"@types/object-inspect": "^1.13.0",
+		"@types/tape": "^5.6.5",
+		"auto-changelog": "^2.5.0",
+		"eclint": "^2.8.1",
+		"encoding": "^0.1.13",
+		"eslint": "=8.8.0",
+		"evalmd": "^0.0.19",
+		"in-publish": "^2.0.1",
+		"npmignore": "^0.3.1",
+		"nyc": "^10.3.2",
+		"safe-publish-latest": "^2.0.0",
+		"tape": "^5.9.0",
+		"typescript": "next"
+	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"template": "keepachangelog",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false,
+		"hideCredit": true
+	},
+	"publishConfig": {
+		"ignore": [
+			".github/workflows"
+		]
+	},
+	"engines": {
+		"node": ">= 0.4"
+	}
+}

pwa/node_modules/side-channel-list/test/index.js

@@ -0,0 +1,104 @@
+'use strict';
+
+var test = require('tape');
+
+var getSideChannelList = require('../');
+
+test('getSideChannelList', function (t) {
+	t.test('export', function (st) {
+		st.equal(typeof getSideChannelList, 'function', 'is a function');
+
+		st.equal(getSideChannelList.length, 0, 'takes no arguments');
+
+		var channel = getSideChannelList();
+		st.ok(channel, 'is truthy');
+		st.equal(typeof channel, 'object', 'is an object');
+		st.end();
+	});
+
+	t.test('assert', function (st) {
+		var channel = getSideChannelList();
+		st['throws'](
+			function () { channel.assert({}); },
+			TypeError,
+			'nonexistent value throws'
+		);
+
+		var o = {};
+		channel.set(o, 'data');
+		st.doesNotThrow(function () { channel.assert(o); }, 'existent value noops');
+
+		st.end();
+	});
+
+	t.test('has', function (st) {
+		var channel = getSideChannelList();
+		/** @type {unknown[]} */ var o = [];
+
+		st.equal(channel.has(o), false, 'nonexistent value yields false');
+
+		channel.set(o, 'foo');
+		st.equal(channel.has(o), true, 'existent value yields true');
+
+		st.equal(channel.has('abc'), false, 'non object value non existent yields false');
+
+		channel.set('abc', 'foo');
+		st.equal(channel.has('abc'), true, 'non object value that exists yields true');
+
+		st.end();
+	});
+
+	t.test('get', function (st) {
+		var channel = getSideChannelList();
+		var o = {};
+		st.equal(channel.get(o), undefined, 'nonexistent value yields undefined');
+
+		var data = {};
+		channel.set(o, data);
+		st.equal(channel.get(o), data, '"get" yields data set by "set"');
+
+		st.end();
+	});
+
+	t.test('set', function (st) {
+		var channel = getSideChannelList();
+		var o = function () {};
+		st.equal(channel.get(o), undefined, 'value not set');
+
+		channel.set(o, 42);
+		st.equal(channel.get(o), 42, 'value was set');
+
+		channel.set(o, Infinity);
+		st.equal(channel.get(o), Infinity, 'value was set again');
+
+		var o2 = {};
+		channel.set(o2, 17);
+		st.equal(channel.get(o), Infinity, 'o is not modified');
+		st.equal(channel.get(o2), 17, 'o2 is set');
+
+		channel.set(o, 14);
+		st.equal(channel.get(o), 14, 'o is modified');
+		st.equal(channel.get(o2), 17, 'o2 is not modified');
+
+		st.end();
+	});
+
+	t.test('delete', function (st) {
+		var channel = getSideChannelList();
+		var o = {};
+		st.equal(channel['delete']({}), false, 'nonexistent value yields false');
+
+		channel.set(o, 42);
+		st.equal(channel.has(o), true, 'value is set');
+
+		st.equal(channel['delete']({}), false, 'nonexistent value still yields false');
+
+		st.equal(channel['delete'](o), true, 'deleted value yields true');
+
+		st.equal(channel.has(o), false, 'value is no longer set');
+
+		st.end();
+	});
+
+	t.end();
+});

pwa/node_modules/side-channel-list/tsconfig.json

@@ -0,0 +1,9 @@
+{
+	"extends": "@ljharb/tsconfig",
+	"compilerOptions": {
+		"target": "es2021",
+	},
+	"exclude": [
+		"coverage",
+	],
+}