fix: dark-mode text color override for Citrus theme

Add torchvision (0.26.0, matches torch 2.11.0) for the per-chunk segment/streaming path

Stream generated video chunk-by-chunk to the UI as each chunk decodes

Upload app.py with huggingface_hub

Evoke text-to-video (t2v) demo: vendored engine + Gradio app

initial commit