fix(web): read tool result from correct field in history loading

The SDK persists tool results as ToolResultPart with a "result" JSON field,
but extractAllToolResults was only reading "output", causing exec tool
stdout/stderr/exit_code to be lost when loading chat history.

apps/web/src/composables/api/useChat.content.ts

@@ -46,7 +46,7 @@ export function extractAllToolResults(
       const part = p as Record<string, unknown>
       return {
         toolCallId: String(part.toolCallId ?? ''),
-        output: part.output ?? null,
+        output: part.output ?? part.result ?? null,
       }
     })
 }