fix(canvas): WiFi badge follows the run, Wokwi-style

The badge used to render from the moment a radio-capable board was on
the canvas, so a fresh XIAO ESP32-S3 project showed a WiFi icon before
Run was ever pressed. Now it appears when the simulation starts (gray
while the stack boots, green on got_ip) and leaves on Stop.

startBoard also clears the board's stale wifiStatus/bleStatus: they were
never reset, so a re-run would have opened the badge showing the
previous run's association.

frontend/src/components/simulator/SimulatorCanvas.tsx

@@ -2854,10 +2854,12 @@ export const SimulatorCanvas = ({ headerSlot }: SimulatorCanvasProps = {}) => {
                 <span data-velxio-slot="wifi-panel" />
 
                 {/* WiFi status indicator + IoT-gateway launcher (ESP32 + Pico W).
-                    Renders from the moment a radio-capable board is active —
-                    before a Run it shows as disconnected, so the icon is a
-                    stable place to click (the overlay hangs its panel off it). */}
+                    Wokwi-style lifecycle: nothing until Run. The badge appears
+                    with the simulation (gray while the stack boots, green on
+                    got_ip) and leaves on Stop. The overlay hangs its WiFi
+                    panel off it while it is up. */}
                 {activeBoard &&
+                  activeBoard.running &&
                   (isEsp32Kind(activeBoard.boardKind) || activeBoard.boardKind === 'pi-pico-w') &&
                   (() => {
                     // The Pico W virtual net assigns its IP deterministically when

frontend/src/store/useSimulatorStore.ts

@@ -2340,6 +2340,18 @@ export const useSimulatorStore = create<SimulatorState>((set, get) => {
       const board = get().boards.find((b) => b.id === boardId);
       if (!board) return;
 
+      // A fresh run starts with a clean radio state. The WiFi/BLE badges are
+      // only visible while the board runs, and nothing else clears them, so
+      // without this a re-run opens showing the PREVIOUS run's association
+      // (a green got_ip badge for a connection nothing has made yet).
+      if (board.wifiStatus || board.bleStatus) {
+        set((s) => ({
+          boards: s.boards.map((b) =>
+            b.id === boardId ? { ...b, wifiStatus: undefined, bleStatus: undefined } : b,
+          ),
+        }));
+      }
+
       // Pro gate (run backstop): catches STM32/Pi boards that entered the
       // canvas via an example or a loaded project (which bypass the picker's
       // add gate). Non-paid web users get the upgrade prompt instead of a run.