feat(coding-agent): add configurable assistant output padding

Closes #6168

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

@@ -2,6 +2,7 @@ import type { AssistantMessage } from "@earendil-works/pi-ai";
 import { describe, expect, test } from "vitest";
 import { AssistantMessageComponent } from "../src/modes/interactive/components/assistant-message.ts";
 import { initTheme } from "../src/modes/interactive/theme/theme.ts";
+import { stripAnsi } from "../src/utils/ansi.ts";
 
 const OSC133_ZONE_START = "\x1b]133;A\x07";
 const OSC133_ZONE_END = "\x1b]133;B\x07";
@@ -71,4 +72,28 @@ describe("AssistantMessageComponent", () => {
 		expect(rendered).toContain("maximum output token limit");
 		expect(rendered).toContain("response may be incomplete");
 	});
+
+	test("uses configured output padding for text and thinking", () => {
+		initTheme("dark");
+
+		const component = new AssistantMessageComponent(
+			createAssistantMessage([
+				{ type: "text", text: "hello" },
+				{ type: "thinking", thinking: "reasoning" },
+			]),
+			false,
+			undefined,
+			"Thinking...",
+			1,
+		);
+		const lines = component.render(80).map((line) => stripAnsi(line));
+
+		expect(lines.some((line) => line.includes(" hello"))).toBe(true);
+		expect(lines.some((line) => line.includes(" reasoning"))).toBe(true);
+
+		component.setOutputPad(0);
+		const updatedLines = component.render(80).map((line) => stripAnsi(line));
+		expect(updatedLines.some((line) => line.startsWith("hello"))).toBe(true);
+		expect(updatedLines.some((line) => line.startsWith("reasoning"))).toBe(true);
+	});
 });

packages/coding-agent/test/settings-manager.test.ts

@@ -397,6 +397,29 @@ describe("SettingsManager", () => {
 		});
 	});
 
+	describe("outputPad", () => {
+		it("should default to 1 and persist binary values", async () => {
+			const manager = SettingsManager.create(projectDir, agentDir);
+
+			expect(manager.getOutputPad()).toBe(1);
+
+			manager.setOutputPad(0);
+			await manager.flush();
+
+			expect(manager.getOutputPad()).toBe(0);
+			const savedSettings = JSON.parse(readFileSync(join(agentDir, "settings.json"), "utf-8"));
+			expect(savedSettings.outputPad).toBe(0);
+		});
+
+		it("should treat unsupported outputPad values as default padding", () => {
+			writeFileSync(join(agentDir, "settings.json"), JSON.stringify({ outputPad: 2 }));
+
+			const manager = SettingsManager.create(projectDir, agentDir);
+
+			expect(manager.getOutputPad()).toBe(1);
+		});
+	});
+
 	describe("shellCommandPrefix", () => {
 		it("should load shellCommandPrefix from settings", () => {
 			const settingsPath = join(agentDir, "settings.json");

packages/coding-agent/test/suite/regressions/5943-session-start-notify.test.ts

@@ -97,6 +97,7 @@ type ReloadCommandContext = {
 	settingsManager: {
 		getHttpIdleTimeoutMs: () => number;
 		getHideThinkingBlock: () => boolean;
+		getOutputPad: () => 0 | 1;
 		getEditorPaddingX: () => number;
 		getAutocompleteMaxVisible: () => number;
 		getShowHardwareCursor: () => boolean;
@@ -168,6 +169,7 @@ function createReloadCommandContext(overrides: ReloadCommandContextOverrides = {
 		settingsManager: {
 			getHttpIdleTimeoutMs: () => 0,
 			getHideThinkingBlock: () => false,
+			getOutputPad: () => 1,
 			getEditorPaddingX: () => 1,
 			getAutocompleteMaxVisible: () => 10,
 			getShowHardwareCursor: () => false,