feat: migrate from nostr-tools to nostr-crypto-utils@0.5.0

Replace nostr-tools dependency with nostr-crypto-utils for all Nostr
cryptographic operations (NIP-04, NIP-44, NIP-49, NIP-19, key generation,
event signing). Add esbuild plugin to stub Node.js built-in modules.

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

Author: vveerrgg

build.js

@@ -34,6 +34,25 @@ const chromeEntryPoints = {
 
 const shared = {
     bundle: true,
+    plugins: [{
+        name: 'node-module-stubs',
+        setup(build) {
+            // Stub out Node.js built-in modules that crypto-browserify tries to import.
+            // The extension runs in a browser context where window.crypto is always
+            // available, so the crypto-browserify fallback path is never reached.
+            const stubs = ['stream', 'crypto'];
+            for (const mod of stubs) {
+                build.onResolve({ filter: new RegExp(`^${mod}$`) }, () => ({
+                    path: mod,
+                    namespace: 'node-stub',
+                }));
+            }
+            build.onLoad({ filter: /.*/, namespace: 'node-stub' }, () => ({
+                contents: 'module.exports = {};',
+                loader: 'js',
+            }));
+        },
+    }],
 };
 
 // Static assets shared by both Safari and Chrome builds

package-lock.json

@@ -1,6 +1,6 @@
 {
     "name": "nostrkey",
-    "version": "1.2.2",
+    "version": "1.4.0",
     "description": "Nostr key manager and signer for web apps. Securely store your private keys and sign events without exposing them to websites.",
     "source": [
         "background.js",
@@ -23,10 +23,11 @@
     "author": "Humanjava Enterprises Inc",
     "license": "ISC",
     "dependencies": {
+        "@scure/bip39": "^2.0.1",
         "async-mutex": "^0.5.0",
         "idb": "^8.0.0",
         "json-format-highlight": "^1.0.4",
-        "nostr-tools": "^2.23.1",
+        "nostr-crypto-utils": "^0.5.0",
         "qrcode": "^1.5.4"
     },
     "devDependencies": {