fix: prevent crash when entry.cost becomes undefined between Show condition and render

[kilng235]

Summary

• Fixes a crash where entry.cost.toFixed(4) throws "undefined is not an object" when entry.cost becomes undefined between the Show condition check and the child render
• Wraps the Show children in an IIFE to capture entry.cost in a local variable, closing the reactive race window

Problem

SolidJS Show component's when condition and child render can be separated by a reactive tick. If entry.cost transitions from a number to undefined between the guard check and the child function executing, entry.cost!.toFixed(4) throws because entry.cost is now undefined.

Solution

Capture entry.cost in a local const inside an IIFE within the Show children. This ensures the value is snapshotted at render time, preventing the race condition.

Test plan

• Verify that the SubAgentPanel no longer crashes when entry.cost changes from a number to undefined during reactive updates
• Verify that cost display still works correctly when entry.cost has a valid value

🤖 Generated with Claude Code

[Hotakus]

Thanks for the fix. I'll merge the PR and push an update soon. Appreciate your support.