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

Refactor: split panels into pure logic + UI layers

Parallelize image loading, add thumbnail cache, and 3-phase search

Make lambda strength indicator larger and clearer in active features display

Move lambda below X; use text input to remove spinners

Clean up lambda input: smaller, no spinners, λ label

Expose lambda steering scale in active features UI

Comment out new features (CLIP×φ sort, λ input, brain MEI sidecar) until ready

Sort by CLIP×φ, per-feature λ input, brain MEI sidecar support, gallery in UI

Fix patch panel: image-not-found error message and GPU status label

Switch to modular explorer package (scripts/explorer/)