store: add Edge Add-ons listing imagery (logo, tiles, screenshots)

- Logo 300x300 with sbay-dev gradient mark
- Small tile 440x280 + large tile 1400x560
- Three 1280x800 screenshots: console, architecture, copilot bridge
- Bilingual (AR/EN) using Noto Naskh Arabic + DejaVu
- generate.py reproduces all assets via PIL + arabic-reshaper + python-bidi

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: sultanAalyami