Merge main into async_motion

Resolved merge conflicts by keeping async_motion branch features:
- Still Sands WLED control toggle
- Button loading states for save operations
- Timezone caching for Still Sands
- ID assignment fix for time slot modifications

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

VERSION

@@ -1 +1 @@
-3.2.2
+3.3.1