fix: normalize storage lock failures

src/lnurlcash/storageLock.test.ts

@@ -0,0 +1,30 @@
+import {describe, expect, it, vi} from 'vitest'
+
+import {withStorageLock} from './storageLock'
+
+describe('withStorageLock fallback', () => {
+  it('runs unlocked when Web Locks are unavailable without promising serialization', async () => {
+    vi.stubGlobal('navigator', {})
+    const entered: string[] = []
+    let releaseFirst: (() => void) | undefined
+
+    try {
+      const first = withStorageLock('registry', async () => {
+        entered.push('first')
+        await new Promise<void>((resolve) => {
+          releaseFirst = resolve
+        })
+      })
+      const second = withStorageLock('registry', () => {
+        entered.push('second')
+      })
+
+      await second
+      expect(entered).toEqual(['first', 'second'])
+      releaseFirst?.()
+      await first
+    } finally {
+      vi.unstubAllGlobals()
+    }
+  })
+})