## Summary
- Collapse `live_substream_{on,off,select}` into a unified
`substream_{on,off}` pair, symmetric with `call_{start,end}`.
- Rename the `camera` field on the former `live_substream_select` to
`stream` (it always was a stream ID).
- Add optional `camera` field to both new actions for targeting a
non-selected base camera.
- YAML configs are migrated automatically; URL bookmarks must be updated
by hand.
## Migration
### Cycling between camera and substream (toggle button)
Before:
```yaml
tap_action:
action: custom:advanced-camera-card-action
advanced_camera_card_action: live_substream_on
```
After:
```yaml
tap_action:
action: custom:advanced-camera-card-action
advanced_camera_card_action: substream_on
```
### Selecting a specific substream
Before:
```yaml
tap_action:
action: custom:advanced-camera-card-action
advanced_camera_card_action: live_substream_select
camera: camera.front_door_hd
```
After:
```yaml
tap_action:
action: custom:advanced-camera-card-action
advanced_camera_card_action: substream_on
stream: camera.front_door_hd
```
### Turning the substream off
Before:
```yaml
tap_action:
action: custom:advanced-camera-card-action
advanced_camera_card_action: live_substream_off
```
After:
```yaml
tap_action:
action: custom:advanced-camera-card-action
advanced_camera_card_action: substream_off
```
### URL querystrings (manual update required)
| Before | After |
| --- | --- |
|
`?advanced-camera-card-action.live_substream_select=camera.front_door_hd`
| `?advanced-camera-card-action.substream_on=camera.front_door_hd` |