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/fileviewentry.html

@@ -2,6 +2,11 @@
     <div id="file_${fileid}_name" class="filetitle">Slot</div>
 </div>
 
+<div class="flexcontainer">
+    <div class="filekey">Created</div>
+    <div id="file_${fileid}_created" class="filevalue"></div>
+</div>
+
 <div class="flexcontainer">
     <div class="filekey">Size</div>
     <div id="file_${fileid}_size" class="filevalue"></div>