Fix remote candidate search returning 0 results by mapping preferred_work_mode

feat: complete UI redesign with pastel purple/orange theme

UI: zero gradients, peaceful warm palette, borders for elevation

UI redesign: pastel theme, premium card design, progressive loading

feat: final smoke-test fixes + spectacular README + UI bugfixes

chore: fix all ruff lint errors (174 -> 0), clean up unused imports/vars, fix line lengths

fix: improve UI robustness and test quality

Overhaul: Plackett-Luce ranking, PII anonymization, live fairness dashboard + LLM-free fallback agents

feat(ui): wire search pipeline, add scoring sliders, fix infinite replan loop

feat: Phase 11 Gradio UI — search tab, analytics dashboard, about page