Final fix for categories and fix for slider in UI

Update initial order of categories displayed in UI and port improvements from the github repo UI

Add image similarity mode using forward_embedding FEATURE_DIM descriptors

Replace plot PCA with user-configurable colour blend per PC channel

Add dual PCA modes: full rainbow and plot rainbow

Upsample PCA to model input resolution, add download button

Wider left panel, PCA stacked below image

File upload only previews; Tag button triggers inference

Two-column layout: input/image left, tags right

Fix image dict handling, restore original UI, remove .opencode from repo

Convert app.py to gradio.Server with custom FastAPI routes and @gradio/client frontend

Convert gradio blocks to server and implement Lodestones tagger-experiment