fix: properly parse --port argument in packaged Electron app

- Use regex on full argv string instead of iterating args
- Move express to dependencies for packaging
- Add electron folder to files list in build config

package.json

@@ -2,7 +2,7 @@
   "name": "ghostty-web",
   "version": "0.1.0",
   "description": "Web-based terminal using libghostty-vt and xterm.js",
-  "main": "src/backend/server.js",
+  "main": "electron/main.js",
   "scripts": {
     "start": "electron .",
     "dev": "electron . --port 9997",
@@ -19,13 +19,13 @@
   "license": "MIT",
   "author": "XCTerminal",
   "dependencies": {
+    "express": "^4.18.2",
     "node-pty": "^1.0.0",
     "ws": "^8.18.0"
   },
   "devDependencies": {
     "electron": "^41.0.3",
-    "electron-builder": "^26.8.1",
-    "express": "^4.18.2"
+    "electron-builder": "^26.8.1"
   },
   "build": {
     "appId": "com.xcterminal.app",
@@ -49,12 +49,13 @@
       "target": ["dmg"]
     },
     "files": [
+      "electron/**/*",
       "src/**/*",
       "node_modules/**/*",
       "!node_modules/.cache/**/*"
     ],
     "extraMetadata": {
-      "main": "src/backend/server.js"
+      "main": "electron/main.js"
     },
     "nodeGypRebuild": false,
     "npmRebuild": false