feat(chat-overlay): selection highlight + default size + starting backdrop

- Source.IsDraggable now includes ChatBox and WebSource (was Image-only)
- ChatBox default: 400×1080, top-right corner (1520, 0) on first add
- SeedStartingBackdrop: embeds starting-backdrop.jpg as Background source
  in the Starting scene on first launch (pack:// resource)
This commit is contained in:
2026-08-19 13:01:35 -07:00
parent 70be14e957
commit 6a74147611
4 changed files with 40 additions and 2 deletions
Binary file not shown.

After

Width:  |  Height:  |  Size: 2.8 MiB