Add save timestamp support and log interceptor for enhanced debugging

- Introduced `created_at` metadata for saves, enabling timestamp tracking.
- Added `InterceptorLogger` to capture logs, aiding in error diagnostics.
- Updated web UI to display save creation timestamps.
- Improved save/load functionality to maintain compatibility with older formats.

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

@@ -33,6 +33,7 @@ class SaveEntry {
     this.view.innerHTML = template.replaceAll("${fileid}", String(fileid));
 
     let name = document.getElementById("file_" + fileid + "_name") as HTMLElement;
+    let created = document.getElementById("file_" + fileid + "_created") as HTMLElement;
     let size = document.getElementById("file_" + fileid + "_size") as HTMLElement;
     let deleteBtn = document.getElementById("file_" + fileid + "_delete") as HTMLButtonElement;
     deleteBtn.onclick = () => {
@@ -45,5 +46,17 @@ class SaveEntry {
 
     name.innerText = "Slot " + saveinfo.idx;
     size.innerText = saveinfo.len + " bytes";
+
+    // Format timestamp in browser's local timezone
+    if (saveinfo.created_at) {
+      try {
+        const date = new Date(saveinfo.created_at);
+        created.innerText = date.toLocaleString();
+      } catch (e) {
+        created.innerText = "Invalid date";
+      }
+    } else {
+      created.innerText = "Unknown";
+    }
   }
 }