Add Streamlit interface for motion mosaics

[jeonghoonkang]

Summary

• add a Streamlit page that reuses the no-detect mosaic utilities to build the latest motion collage on demand
• keep the most recently generated mosaic in session state so it stays visible after the request

Testing

• python -m compileall apps/camera/motion/tile_send/motion_mosaic_streamlit.py

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https://chatgpt.com/codex/tasks/task_e_68e9c8a55b288331a7b4c350eee78eea

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Handle empty motion directory before generating mosaic

In the default code path the script calls latest_images(32) and immediately passes the result into create_mosaic. When /var/lib/motion has no recent files (common on first boot or if Motion stopped) latest_images returns an empty list and create_mosaic raises a ValueError, terminating the run before any telemetry is sent. The --date branch already handles this case explicitly; the live branch should similarly bail out or show a warning instead of crashing.

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