Use npm as fallback if pnpm isn't available & more robust pnpm installation

src/ipc/handlers/app_handlers.ts

@@ -65,12 +65,16 @@ async function executeAppLocalNode({
   appId: number;
   event: Electron.IpcMainInvokeEvent;
 }): Promise<void> {
-  const process = spawn("pnpm install && pnpm run dev --port 32100", [], {
+  const process = spawn(
+    "(pnpm install && pnpm run dev --port 32100) || (npm install && npm run dev -- --port 32100)",
+    [],
+    {
       cwd: appPath,
       shell: true,
       stdio: "pipe", // Ensure stdio is piped so we can capture output/errors and detect close
       detached: false, // Ensure child process is attached to the main process lifecycle unless explicitly backgrounded
-  });
+    }
+  );
 
   // Check if process spawned correctly
   if (!process.pid) {

src/ipc/handlers/node_handlers.ts

@@ -50,7 +50,7 @@ export function registerNodeHandlers() {
       // If not, try to install it using corepack.
       // If both fail, then pnpm is not available.
       checkCommandExists(
-        "pnpm --version || corepack enable pnpm && pnpm --version"
+        "pnpm --version || (corepack enable pnpm && pnpm --version) || (npm install -g pnpm@latest-10 && pnpm --version)"
       ),
     ]);
     // Default to mac download url.