(Blueprint) Snapshot preview shows wrong camera when multiple cameras are configured #739

Checklist

• I'm running the newest version of LLM Vision. (v1.7.2 per HACS. Note: the v1.7.2 tag's manifest.json still says 1.7.1; see comment below.)
• I have enabled debug logging for the integration. (Not relevant here: the integration behaves correctly. The bug is in the blueprint's templates. See "Logs" below.)
• I have filled out the issue template to the best of my ability.
• This issue only contains 1 issue.
• This is a bug and not a feature request.
• I have searched open issues for my problem.

Describe the issue

(Blueprint) With more than one camera in camera_entities, the Snapshot preview notification shows the wrong camera. Sometimes it shows a broken image.

Cause, in blueprints/event_summary.yaml:

• camera.snapshot targets every camera in camera_entities, not just the one that triggered.
• camera_file_path is always built from camera_entities_list[0].

So every camera writes to the first camera's last_motion.jpg. The notification attaches whichever camera wrote last. If the phone fetches the file while it's being rewritten, you get a broken image.

Reproduction steps

1. Set up the AI Event Summary blueprint with two cameras (e.g. camera.front_yard_camera, camera.right_camera) and their motion sensors, Preview mode = Snapshot.
2. Trigger motion on the second camera only.
3. Notification says "Right camera has detected activity." but the thumbnail is from the front yard camera. Sometimes it's a broken image.

Logs

No integration error: the integration does what the blueprint asks. Related note: the obvious one-line fix (entity_id: "{{ camera_entity }}" on the legacy service: form) is rejected by config validation:

Blueprint 'AI Event Summary (v1.6.0)' generated invalid automation ...: not a valid value for dictionary value @ data['actions'][2]...['sequence'][0]['entity_id']. Got '{{ camera_entity }}'

so the fix needs target: entity_id:.

Fix

PR #738 snapshots only camera_entity (via target:) and builds camera_file_path from it.