Sync explorer: UI improvements, bug fixes, DynaDiff NSD index fix

Replace NSD toggle with RadioButtonGroup, hide dataset dropdown when no compare data

Fix nsd_subset_toggle: always visible, remove ordering-dependent visibility code

Add NSD sub01 subset toggle, union dataset, and dual CLIP embeddings

Sync local changes: CLIP scores, NSD image lookup, multi-trial DynaDiff, phi_c columns, P75 col, label captions, entrypoint pre-warm

Fix .dockerignore: keep diffusers README.md (setup.py requires it)

Speed up builds: move CACHEBUST, drop pytorch-lightning conflict, add .dockerignore

Fix OOM: pin torch==2.3.0, remove VD build-time download

Pin xformers==0.0.27 to match torch 2.3.0, fix OOM build

Fix Dockerfile parse error: avoid 'from' at line start in RUN python -c

Fix DynaDiff VD weights, xformers, and brain thumbnail path resolution

Refactor explorer_app: _State class, extract panel builders, remove phi_mask_toggle

Add fake nvcc stub: model/models.py imports deepspeed at top level which calls nvcc -V on import

Revert VD build-time download (OOMKilled); VD downloads at runtime in background thread

Pre-download VersatileDiffusion at build time to eliminate cold-start latency

Fix deepspeed build: unset CUDA_HOME during pip install, move ENV to post-install

Set CUDA_HOME and disable deepspeed runtime CUDA op compilation

Pin transformers==4.41.2 to fix FLAX_WEIGHTS_NAME import error

Fix dynadiff structure: diffusers repo in diffusers/ subdir