Feature Request: Adjustable Status Light for Panda

Currently, the status light remains active even when the printer is turned off, and its brightness cannot be adjusted per situation. This limits flexibility and can cause unnecessary light distraction.

**Use Case**

- When the printer is turned off, the status light should automatically turn off.
- When the printer enters sleep mode, the brightness should automatically dim.
- In case of an error, the brightness should go to maximum, making the status immediately noticeable.

**Benefits**

- Reduced unnecessary light when the printer is not in use.
- Improved energy efficiency (light off when the printer is powered down).
- Clearer visual signals adapted to different states.
- Enhanced user experience with more control over the status lighting.

The issue names no files, tests, or entry points. Start by mapping how Panda_Status currently handles the light during power-off, sleep, and error states, then confirm the expected brightness behavior for each state. Done means the light is off when powered down, dim in sleep, and at maximum brightness on errors.

Written by the indexing model from the issue text.