fix: stage rebuilt better-sqlite3 for Electron packaging

Rebuilds better-sqlite3 separately for Electron before packaging
Copies the native binary into the packaged app resources
Updates packaging docs to explain the afterPack workaround

packages/electron/scripts/rebuild-native.mjs

@@ -133,6 +133,19 @@ const ensureWindowsNodeAddonApiForNodePty = async (rebuildRootPath) => {
 
 console.log(`[electron] rebuilding native modules against Electron ${electronVersion}...`);
 
+await rebuild({
+  buildPath: electronDir,
+  electronVersion,
+  force: true,
+  arch: targetArchitecture.electronBuilder,
+  onlyModules: ['better-sqlite3'],
+});
+const betterSqliteDir = path.dirname(require.resolve('better-sqlite3/package.json'));
+const betterSqliteBinary = path.join(betterSqliteDir, 'build', 'Release', 'better_sqlite3.node');
+if (!existsSync(betterSqliteBinary)) {
+  throw new Error(`better-sqlite3 rebuild did not produce ${betterSqliteBinary}`);
+}
+
 // Rebuild against the hoisted root node_modules (bun workspace layout).
 // force=true re-links regardless of cached state; prebuild-install lookup is
 // bypassed by @electron/rebuild in favor of direct node-gyp builds.
@@ -145,7 +158,7 @@ try {
     electronVersion,
     force: true,
     arch: targetArchitecture.electronBuilder,
-    onlyModules: ['better-sqlite3', 'node-pty', 'bun-pty'],
+    onlyModules: ['node-pty', 'bun-pty'],
   });
 } finally {
   try {