Restore Space to revision 33c3dda

Restore ai_ext.py from 33c3dda

Summaries only and add AI shorts video generation from wall posts

Change AI rewrite to concise main-point summaries only

Remove AI compose box and fix HF token/Qwen/Jina handling

Fix AI scraping with Jina Reader/Search and require Qwen for summaries

Fix AI URL input persistence and improve internet-sourced topic posts

Add AI wall topic/url Qwen2.5-VL extension