fix(terminal): auto-provision Linux sandbox and prevent infinite loop during installation

src/plugins/terminal/www/Terminal.js

@@ -9,6 +9,40 @@ const Terminal = {
      * @returns {Promise<boolean>} - Returns true if installation completes with exit code 0, void if not installing
      */
     async startAxs(installing = false, logger = console.log, err_logger = console.error,failsafe = false) {
+        // Guard against callers (core terminal UI, or third-party plugins such as
+        // AI copilots that shell out to run `npm`/`node`) invoking startAxs before
+        // the Alpine sandbox has ever been provisioned on this device. Without this
+        // check, init-sandbox.sh does not exist yet and the caller sees a confusing
+        // "No such file or directory" + unknown node/npm versions instead of the
+        // sandbox being set up automatically.
+        if (!this._provisioning && !(await this.isInstalled())) {
+            if (!installing) {
+                const message = "Linux sandbox is not installed yet. Open Terminal once (or let the plugin install it) before running commands.";
+                err_logger(message);
+                throw new Error(message);
+            }
+
+            // install() finishes by calling startAxs(true, ...) itself to apply the
+            // final sandbox configuration, at a point where isInstalled() is still
+            // false (the .configured marker is written by init-sandbox.sh during
+            // that very call). The _provisioning flag prevents that internal call
+            // from re-entering install() and recursing forever.
+            logger("Linux sandbox not found, installing it first...");
+            this._provisioning = true;
+            let installed;
+            try {
+                installed = await this.install(logger, err_logger);
+            } finally {
+                this._provisioning = false;
+            }
+            if (!installed) {
+                const message = this.lastInstallError || "Failed to install the Linux sandbox required to run this command.";
+                err_logger(message);
+                return false;
+            }
+            return true;
+        }
+
         const filesDir = await new Promise((resolve, reject) => {
             system.getFilesDir(resolve, reject);
         });