Improve mobile header and participants dropdown UX.

Add demo trio personas and polish empty-state panel UX.

Harden Expert Persona builder and add model suggestion.

fix(ui): equalize table view opinion column widths

Build credentials during Phase 1 and streamline human participant setup.

feat(ui): header cleanup + Table View shortcut + post-chat downloads strip

feat: human participant turns + credential intake redesign

feat(ui): consolidate downloads, move theme into settings, restructure & darken settings menu, fix max-participants prop wiring

rename: 'CCAI Vibe Demo' -> 'Collaborative Conversational AI (CCAI) Demo'

feat(transparency): add "View current chat prompts" to settings

feat(participants): add "Select N Automatically" option

feat(limits): expose repetition / failsafe limits in settings menu

Surface Credential Summary in settings + exports

Tighten CCAI conversation flow and visual threading

Build CCAI Vibe Demo on top of LLMChats3 baseline