Add Chained/Direct presets, Future Prediction UI cleanup, and gallery tweaks

Move rgb to the end of DENSE_CHAIN

Retune any-to-any chain/hyperparameters, add FP video upload and live status

Retune RGB-to-others chain/hyperparameters, drop unused CHAIN_PRESETS

Fix FP target auto-reselect, restore real caption samples, batch

Add complete/skip toggle for FP's observed modality, fix ZeroGPU duration,

Sync UI redesign and precompute work from hf-demo, keep Spaces fixes