Add electron-builder packaging configuration

- Install electron-builder as dev dependency
- Configure build targets for macOS (dmg, zip), Windows (nsis, zip), and Linux (AppImage, deb)
- Add npm scripts for building unpacked app (dist:dir) and macOS packages (dist:mac)
- Set base path to "./" in production builds for proper asset loading in packaged app
- Fix index.html asset paths to use relative paths (./ prefix)
- Update README to document packaging commands and note unsigned/unnotarized status

package.json

@@ -2,6 +2,7 @@
   "name": "nextcloud-notes-tauri",
   "private": true,
   "version": "0.2.2",
+  "description": "Desktop client for Nextcloud Notes built with Electron, React, and TypeScript.",
   "type": "module",
   "main": "electron/main.cjs",
   "scripts": {
@@ -11,6 +12,8 @@
     "dev:desktop": "concurrently -k \"npm:dev:renderer\" \"npm:dev:electron\"",
     "build": "tsc && vite build",
     "desktop": "electron .",
+    "dist:dir": "npm run build && electron-builder --dir",
+    "dist:mac": "npm run build && electron-builder --mac dmg zip",
     "preview": "vite preview",
     "tauri": "tauri"
   },
@@ -42,10 +45,47 @@
     "concurrently": "^9.2.1",
     "cross-env": "^10.1.0",
     "electron": "^37.3.1",
+    "electron-builder": "^26.8.1",
     "postcss": "^8.5.8",
     "tailwindcss": "^3.4.19",
     "typescript": "~5.8.3",
     "vite": "^7.0.4",
     "wait-on": "^8.0.5"
+  },
+  "build": {
+    "appId": "cz.davidrelich.nextcloud-notes-desktop",
+    "productName": "Nextcloud Notes Desktop",
+    "directories": {
+      "output": "release"
+    },
+    "files": [
+      "dist/**/*",
+      "electron/**/*",
+      "package.json"
+    ],
+    "asar": true,
+    "npmRebuild": false,
+    "mac": {
+      "category": "public.app-category.productivity",
+      "icon": "src-tauri/icons/icon.icns",
+      "target": [
+        "dmg",
+        "zip"
+      ]
+    },
+    "win": {
+      "icon": "src-tauri/icons/icon.ico",
+      "target": [
+        "nsis",
+        "zip"
+      ]
+    },
+    "linux": {
+      "icon": "src-tauri/icons/icon.png",
+      "target": [
+        "AppImage",
+        "deb"
+      ]
+    }
   }
 }