refactor(professional): rebuild the workbench on top of builder-driven state

[LoganLCX]

Summary

• refactor practices/professional to use builder-derived state instead of duplicated local business state
• add local hooks for builder/chart type/schema/dimensions/measures/where/having/undo state
• add theme and locale foundation for the professional demo
• rebuild the professional workbench UI with a compact layout
• add editable dimension/measure panels, where filters, having filters, and encoding interactions
• remove obsolete professional-only demo scaffolding and unused legacy components

Validation

• pnpm --filter=professional run typecheck
• pnpm --filter=professional run build

Follow-up

• complete date-oriented where filters
• add measure format UI
• do a full page-level interaction QA pass