fix: rebuild better-sqlite3 for Electron's Node ABI in prod builds

Electron 41 embeds Node 24 (ABI 145) while system Node 22 (ABI 127)
produces incompatible native modules. Add electron-rebuild step to the
desktop build pipeline so better-sqlite3 is recompiled against
Electron's headers before packaging.

package-lock.json

@@ -36350,6 +36350,7 @@
         "ws": "^8.14.2"
       },
       "devDependencies": {
+        "@electron/rebuild": "^4.0.3",
         "@types/node": "24.6.0",
         "@types/ws": "^8.5.14",
         "electron": "41.0.3",

packages/desktop/package.json

@@ -5,9 +5,10 @@
   "description": "Paseo desktop app (Electron wrapper)",
   "main": "dist/main.js",
   "scripts": {
-    "build": "npm --prefix ../.. run build:daemon && npm run build:main && electron-builder --config electron-builder.yml",
+    "build": "npm --prefix ../.. run build:daemon && npm run build:main && npm run rebuild-native && electron-builder --config electron-builder.yml",
     "build:main": "tsc -p tsconfig.json",
     "dev": "./scripts/dev.sh",
+    "rebuild-native": "electron-rebuild -m ../.. -o better-sqlite3",
     "test": "vitest run",
     "typecheck": "tsc --noEmit -p tsconfig.json"
   },
@@ -19,6 +20,7 @@
     "ws": "^8.14.2"
   },
   "devDependencies": {
+    "@electron/rebuild": "^4.0.3",
     "@types/node": "24.6.0",
     "@types/ws": "^8.5.14",
     "electron": "41.0.3",