[Bug]: BaseUI on EInk can sometimes leave Dock shown at shutdown

### Category

Other

### Hardware

T-Echo

### Is this bug report about any UI component firmware like InkHUD or Meshtatic UI (MUI)?

- [ ] Meshtastic UI aka MUI colorTFT
- [ ] InkHUD ePaper
- [x] OLED slide UI on any display

### Firmware Version

2.7.15

### Description

BaseUI on EInk can sometimes leave Dock shown at shutdown

### Relevant log output

```Shell

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