Restore pre-Runpod ZeroGPU Extend (match extend-current-20260923 / GitHub main)

Wire Generate/Extend to Runpod kyujeqw2gt779h (merge PR #2)

Fix custom-image Extend freeze: match size before I2V + re-encode concat (#1)

Fix: remove unsupported info= on gr.Image

Add Extend prompt + custom start image controls (app.py)

Initial Wan 2.2 I2V Extend Space (Generate + last-frame chain)