Update app.py

match preview slider range to steps; harden preview edge cases

stream per-step previews with client-side scrubber; archive old app.py

add requirements.txt for HF Space

Merge remote-tracking branch 'hf/main'

app changes for fallback to hf model

initial commit

data preparation file

t2i v4 train script added

preliminary working version v4

v4

sorta working v3