Multi-swap renders artifact/duplicate quote boxes

[premiumjibles]

Problem

When doing multiple swaps in one message (e.g. "badger and req sell for usdc"), the UI renders artifact/duplicate quote boxes. Swaps execute serially (correct) but all cards render simultaneously, and failed cards stay fully expanded.

tk ticket: sa-lgqo
Repro: Request 2+ swaps in one message. Observe redundant quote boxes.

Root Cause (3 factors)

1. Simultaneous card rendering with serial execution — Both InitiateSwapUI mount at once but execution is serialized via withWalletLock. Second card shows full quote but stepper is stuck waiting.
2. Failed swaps leave full cards visible — No collapsed/minimized state for completed or failed swaps.
3. LLM retries in multi-step loop — With stepCountIs(5), LLM may retry failed swaps, producing a third card.

Proposed Fix

Option C (minimal): Auto-collapse completed/failed swap cards to single-line summary so only active swap shows full detail.

Key Files

• apps/agentic-chat/src/components/tools/InitiateSwapUI.tsx — needs collapsed state
• apps/agentic-chat/src/components/tools/useSwapExecution.tsx
• apps/agentic-chat/src/lib/walletMutex.ts — serializes ops but UI unaware
• apps/agentic-chat/src/components/AssistantMessage.tsx — renders tool parts independently

Acceptance Criteria

• Multi-swap doesn't show redundant artifact quote boxes
• Each swap shows appropriate visual state (pending/active/complete/failed)
• Failed swaps visually de-emphasized when others still executing
• Single-swap behavior unchanged