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/hal/esp.rs

@@ -570,7 +570,8 @@ impl Esp<'_> {
 
     /// Persist a JSON config blob to the next wear-leveling slot.
     pub(crate) async fn save_config(&mut self, mut config: Vec<u8>) -> FatResult<()> {
-        self.savegame.save(config.as_mut_slice())?;
+        let timestamp = self.get_time().to_rfc3339();
+        self.savegame.save(config.as_mut_slice(), &timestamp)?;
         Ok(())
     }