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

packages/coding-agent/src/modes/interactive/components/assistant-message.ts

@@ -2,6 +2,10 @@ import type { AssistantMessage } from "@mariozechner/pi-ai";
 import { Container, Markdown, type MarkdownTheme, Spacer, Text } from "@mariozechner/pi-tui";
 import { getMarkdownTheme, theme } from "../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";
+
 /**
  * Component that renders a complete assistant message
  */
@@ -11,6 +15,7 @@ export class AssistantMessageComponent extends Container {
 	private markdownTheme: MarkdownTheme;
 	private hiddenThinkingLabel: string;
 	private lastMessage?: AssistantMessage;
+	private hasToolCalls = false;
 
 	constructor(
 		message?: AssistantMessage,
@@ -54,6 +59,17 @@ export class AssistantMessageComponent extends Container {
 		}
 	}
 
+	override render(width: number): string[] {
+		const lines = super.render(width);
+		if (this.hasToolCalls || lines.length === 0) {
+			return lines;
+		}
+
+		lines[0] = OSC133_ZONE_START + lines[0];
+		lines[lines.length - 1] = OSC133_ZONE_END + OSC133_ZONE_FINAL + lines[lines.length - 1];
+		return lines;
+	}
+
 	updateContent(message: AssistantMessage): void {
 		this.lastMessage = message;
 
@@ -108,6 +124,7 @@ export class AssistantMessageComponent extends Container {
 		// Check if aborted - show after partial content
 		// But only if there are no tool calls (tool execution components will show the error)
 		const hasToolCalls = message.content.some((c) => c.type === "toolCall");
+		this.hasToolCalls = hasToolCalls;
 		if (!hasToolCalls) {
 			if (message.stopReason === "aborted") {
 				const abortMessage =