refactor: consolidate requests and finalize agent tool states

Share project JSON transport, interaction replies and report selectors.
Settle tool progress consistently for direct streams, reconnects and history, preserving failure reasons and stopped state.

src/features/agent/components/agent-command-panel.tsx

@@ -1066,6 +1066,11 @@ function BackendMessage({
                 <AgentUserMessageText content={message.content} />
               )
             ) : null}
+            {message.role === "assistant" && message.runError && message.content !== `错误：${message.runError}` ? (
+              <p role="status" className="whitespace-pre-wrap break-words text-sm text-destructive">
+                错误：{message.runError}
+              </p>
+            ) : null}
             {message.role === "assistant" && processComplete && hasProcessError ? (
               <p role="status" className="text-xs text-[var(--status-warning-foreground)]">
                 部分查询或工具未完成，可展开处理过程查看原因。