fix: Add a wait after the flash to the Provisioning tab

frontend/src/manufacturing/ProvisioningWizard.jsx

@@ -533,7 +533,7 @@ function StepFlash({ device, onFlashed }) {
       appendSerial("── Serial monitor started (115200 baud) ──");
       startSerialMonitor(port);
 
-      onFlashed();
+      // Do NOT auto-advance — user clicks "Proceed to Verify" when ready
     } catch (err) {
       setError(err.message || String(err));
       setFlashing(false);
@@ -588,6 +588,7 @@ function StepFlash({ device, onFlashed }) {
         )}
 
         {!busy && (
+          <div className="flex items-center gap-3">
             <button
               onClick={handleFlash}
               disabled={!webSerialAvailable}
@@ -599,6 +600,16 @@ function StepFlash({ device, onFlashed }) {
               </svg>
               {done ? "Flash Again" : "Connect & Flash Device"}
             </button>
+            {done && (
+              <button
+                onClick={onFlashed}
+                className="flex items-center gap-2 px-5 py-2 text-sm rounded-md font-medium hover:opacity-90 transition-opacity cursor-pointer"
+                style={{ backgroundColor: "var(--accent)", color: "var(--bg-primary)" }}
+              >
+                Proceed to Verify →
+              </button>
+            )}
+          </div>
         )}
 
         {flashing && (