fix(frontend): render card chips for backticked card names in answers (#67)

feat(chat): render Reasoning/Answer as section eyebrows

feat(frontend): render rb_* symbol icons, keyword tooltips, tolerant card detection

feat(frontend): highlight multi-word card names in judge answers

feat(ui): redesign chat page with ChatGPT-style layout and visual polish

feat(ui): add keyword badges with skewed style in answer display