UI redesign: consistent design system, card layout, unified colors and typography

Load preset image into patch explorer (not just GT brain)

Add Save as Preset button (--editable-examples flag); wire examples file in entrypoint

Fix Bokeh _pending_writes error by deferring on_change work; guard slider access against stale sessions

Bake CLIP model into Docker image; move active tiles render to background thread

Fix GT brain render race conditions with staleness tokens

Show NSD image ID in patch figure title; add image field to example presets

Add GT brain render cache, NSD-only phi maps, and parallel precomputation

Add pyvista renderer, precomputed phi map cache, and background-thread steering brain renders

Refactor: split panels into pure logic + UI layers