v0.1.31

Changelog

• 4627cb7 feat: expose system_prompt and max_history in AI config UI (close #214)
• 4421bca fix: color error spans red in timeline and flow views
• abfd91b fix: handle null tool parameters and improve trace error visibility (#213)
• 78c29fd fix: hoist per-property required to top-level array and increase error truncate limit
• 9ecec27 fix: wrap bare properties map into valid JSON Schema and show full error in scrollable section