fix(macos): declare standard BitTorrent file type

scripts/app-associations.node-test.js

@@ -0,0 +1,31 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+import path from 'node:path';
+import test from 'node:test';
+
+const repositoryRoot = path.resolve(import.meta.dirname, '..');
+const tauriConfig = JSON.parse(
+  fs.readFileSync(path.join(repositoryRoot, 'src-tauri', 'tauri.conf.json'), 'utf8')
+);
+
+const torrentAssociation = tauriConfig.bundle.fileAssociations.find(association =>
+  association.ext?.some(extension => extension.toLowerCase() === 'torrent')
+);
+
+test('declares the native macOS BitTorrent content type', () => {
+  assert.ok(torrentAssociation, 'the bundle must declare a .torrent association');
+  assert.equal(torrentAssociation.mimeType, 'application/x-bittorrent');
+  assert.deepEqual(torrentAssociation.exportedType, {
+    identifier: 'org.bittorrent.torrent',
+    conformsTo: ['public.data', 'public.item']
+  });
+  assert.equal(
+    torrentAssociation.contentTypes,
+    undefined,
+    'the UTI declaration supplies the extension and MIME tags for clean installs'
+  );
+});
+
+test('declares magnet as a desktop deep-link scheme', () => {
+  assert.deepEqual(tauriConfig.plugins['deep-link'].desktop.schemes, ['firelink', 'magnet']);
+});