Bump version to 0.3.10

Update version number from 0.3.9 to 0.3.10 in Cargo.toml and version.txt files.

Also, enhance image loading handling in multiple Vue components (ContainerItem, CurrentTrack, MediaItem, QueueItem, ServerDrawer) by:
- Adding ref and watch for tracking image loading states
- Implementing proper load and error handlers
- Using v-show to control image visibility based on loading state
- Adding image state tracking for each item in ServerDrawer
- Improving placeholder display logic

version.txt

@@ -1 +1 @@
-0.3.9
+0.3.10