Introduce watchdog and serialization improvements

- Added watchdog timer for improved system stability and responsiveness.
- Switched save data serialization to Bincode for better efficiency.
- Enhanced compatibility by supporting fallback to older JSON format.
- Improved logging during flash operations for easier debugging.
- Simplified SavegameManager by managing storage directly.

Software/MainBoard/rust/src_webpack/src/submitView.ts

@@ -28,11 +28,11 @@ export class SubmitView {
             controller.uploadConfig(this.json.textContent as string, (status: string) => {
                 if (status != "OK") {
                     // Show error toast (click to dismiss only)
-                    const { toast } = require('./toast');
+                    const {toast} = require('./toast');
                     toast.error(status);
                 } else {
                     // Show info toast (auto hides after 5s, or click to dismiss sooner)
-                    const { toast } = require('./toast');
+                    const {toast} = require('./toast');
                     toast.info('Config uploaded successfully');
                 }
                 this.submit_status.innerHTML = status;