✨ feat(serial): add version test via 'ver()' command

- Add test_serial_version() to serial_monitor.py
- Sends 'ver()' command and parses version response
- Add 'Test Version' button in serial panel
- Displays version in status and log

src/gui/main_window.py

@@ -441,6 +441,15 @@ class MainWindow(ctk.CTk):
         )
         read_btn.grid(row=2, column=0, padx=PADDING, pady=PADDING_SMALL)
 
+        # Test version button
+        self._test_version_btn = ctk.CTkButton(
+            panel,
+            text="Test Version",
+            font=FONT_BODY,
+            command=self._test_serial_version,
+        )
+        self._test_version_btn.grid(row=3, column=0, padx=PADDING, pady=PADDING_SMALL)
+
     def _build_status_panel(self, parent: ctk.CTkFrame) -> None:
         """Build the status display panel."""
         panel = ctk.CTkFrame(parent, corner_radius=CORNER_RADIUS)
@@ -972,6 +981,46 @@ class MainWindow(ctk.CTk):
         except Exception as e:
             self._log_message(f"  Error: {e}")
 
+    def _test_serial_version(self) -> None:
+        """Test serial port by sending 'ver()' command and parsing response."""
+        port = self._port_var.get()
+        if not port:
+            self._log_message("No serial port selected")
+            return
+
+        self._log_message(f"Testing version on {port}...")
+        self._test_version_btn.configure(state="disabled", text="Testing...")
+
+        # Run in background thread
+        def test_version_thread():
+            try:
+                from serial_monitor import test_serial_version
+
+                success, message, version = test_serial_version(
+                    port,
+                    self._config.serial_baudrate if self._config else 115200,
+                )
+
+                if success:
+                    if version:
+                        self._log_message(f"  ✓ {message}")
+                        self._log_message(f"  ✓ Version detected: {version}")
+                        self._status.set_status(f"Version: {version}", "success")
+                    else:
+                        self._log_message(f"  ✓ {message}")
+                        self._status.set_status("Port responded", "info")
+                else:
+                    self._log_message(f"  ✗ {message}")
+                    self._status.set_status(message, "error")
+            except Exception as e:
+                self._log_message(f"  ✗ Error: {e}")
+                self._status.set_status(f"Error: {e}", "error")
+            finally:
+                # Re-enable button
+                self.after(0, lambda: self._test_version_btn.configure(state="normal", text="Test Version"))
+
+        threading.Thread(target=test_version_thread, daemon=True).start()
+
     # ── Vitis Check ────────────────────────────────────────────
 
     def _check_vitis(self) -> None: