fix(coding-agent): restore assistant/user turn spacing

packages/coding-agent/test/assistant-message.test.ts

@@ -0,0 +1,57 @@
+import type { AssistantMessage } from "@mariozechner/pi-ai";
+import { describe, expect, test } from "vitest";
+import { AssistantMessageComponent } from "../src/modes/interactive/components/assistant-message.js";
+import { initTheme } from "../src/modes/interactive/theme/theme.js";
+
+const OSC133_ZONE_START = "\x1b]133;A\x07";
+const OSC133_ZONE_END = "\x1b]133;B\x07";
+const OSC133_ZONE_FINAL = "\x1b]133;C\x07";
+
+function createAssistantMessage(content: AssistantMessage["content"]): AssistantMessage {
+	return {
+		role: "assistant",
+		content,
+		api: "openai-responses",
+		provider: "openai",
+		model: "gpt-4o-mini",
+		usage: {
+			input: 0,
+			output: 0,
+			cacheRead: 0,
+			cacheWrite: 0,
+			totalTokens: 0,
+			cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+		},
+		stopReason: "stop",
+		timestamp: Date.now(),
+	};
+}
+
+describe("AssistantMessageComponent", () => {
+	test("adds OSC 133 zone markers to assistant messages without tool calls", () => {
+		initTheme("dark");
+
+		const component = new AssistantMessageComponent(createAssistantMessage([{ type: "text", text: "hello" }]));
+		const lines = component.render(40);
+
+		expect(lines).not.toHaveLength(0);
+		expect(lines[0]).toContain(OSC133_ZONE_START);
+		expect(lines[lines.length - 1].startsWith(OSC133_ZONE_END + OSC133_ZONE_FINAL)).toBe(true);
+	});
+
+	test("does not add OSC 133 zone markers when assistant message contains tool calls", () => {
+		initTheme("dark");
+
+		const component = new AssistantMessageComponent(
+			createAssistantMessage([
+				{ type: "text", text: "calling tool" },
+				{ type: "toolCall", id: "tool-1", name: "read", arguments: { path: "file.txt" } },
+			]),
+		);
+		const rendered = component.render(60).join("\n");
+
+		expect(rendered.includes(OSC133_ZONE_START)).toBe(false);
+		expect(rendered.includes(OSC133_ZONE_END)).toBe(false);
+		expect(rendered.includes(OSC133_ZONE_FINAL)).toBe(false);
+	});
+});