fix: catch GATT server disconnected error in MicrobitMore

- Added .catch() to BLE read operations in updateState and updateMotion
- Ensures bleBusy flag is cleared and error is logged
- Prevents unhandled promise rejections when BLE connection is lost

Co-Authored-By: Gemini <noreply@google.com>

Author: takaokouji

src/extensions/microbitMore/index.js

@@ -858,6 +858,12 @@ class MbitMore {
                     this.soundLevel = dataView.getUint8(6);
                     this.resetConnectionTimeout();
                     resolve(this);
+                })
+                .catch(err => {
+                    window.clearTimeout(this.bleBusyTimeoutID);
+                    this.bleBusy = false;
+                    log.error(err);
+                    resolve(this);
                 });
         });
     }
@@ -999,6 +1005,12 @@ class MbitMore {
                     this.magneticForce.z = dataView.getInt16(16, true);
                     this.resetConnectionTimeout();
                     resolve(this);
+                })
+                .catch(err => {
+                    window.clearTimeout(this.bleBusyTimeoutID);
+                    this.bleBusy = false;
+                    log.error(err);
+                    resolve(this);
                 });
         });
     }