WIP: Rewrite export-html with tree sidebar, client-side rendering

- Add tree sidebar with search and filter (Default/All/Labels)
- Client-side markdown/syntax highlighting via vendored marked.js + highlight.js
- Base64 encode session data to avoid escaping issues
- Reuse theme.ts color tokens via getResolvedThemeColors()
- Sticky sidebar, responsive mobile layout with overlay
- Click tree node to scroll to message
- Keyboard shortcuts: Esc to reset, Ctrl/Cmd+F to search

packages/ai/src/models.generated.ts

@@ -3263,7 +3263,7 @@ export const MODELS = {
 				cacheWrite: 0,
 			},
 			contextWindow: 163840,
-			maxTokens: 163840,
+			maxTokens: 65536,
 		} satisfies Model<"openai-completions">,
 		"deepseek/deepseek-r1-distill-llama-70b": {
 			id: "deepseek/deepseek-r1-distill-llama-70b",
@@ -3563,13 +3563,13 @@ export const MODELS = {
 			reasoning: false,
 			input: ["text", "image"],
 			cost: {
-				input: 0.04,
+				input: 0.036,
-				output: 0.15,
+				output: 0.064,
 				cacheRead: 0,
 				cacheWrite: 0,
 			},
-			contextWindow: 96000,
+			contextWindow: 131072,
-			maxTokens: 96000,
+			maxTokens: 4096,
 		} satisfies Model<"openai-completions">,
 		"google/gemma-3-27b-it:free": {
 			id: "google/gemma-3-27b-it:free",
@@ -5297,8 +5297,8 @@ export const MODELS = {
 			reasoning: true,
 			input: ["text"],
 			cost: {
-				input: 0.039,
+				input: 0.02,
-				output: 0.19,
+				output: 0.09999999999999999,
 				cacheRead: 0,
 				cacheWrite: 0,
 			},
@@ -5348,8 +5348,8 @@ export const MODELS = {
 			reasoning: true,
 			input: ["text"],
 			cost: {
-				input: 0.03,
+				input: 0.016,
-				output: 0.14,
+				output: 0.06,
 				cacheRead: 0,
 				cacheWrite: 0,
 			},
@@ -5994,8 +5994,8 @@ export const MODELS = {
 			reasoning: false,
 			input: ["text"],
 			cost: {
-				input: 0.09,
+				input: 0.06,
-				output: 1.1,
+				output: 0.6,
 				cacheRead: 0,
 				cacheWrite: 0,
 			},

packages/coding-agent/package.json

@@ -32,8 +32,8 @@
 		"clean": "rm -rf dist",
 		"build": "tsgo -p tsconfig.build.json && chmod +x dist/cli.js && npm run copy-assets",
 		"build:binary": "npm run build && bun build --compile ./dist/cli.js --outfile dist/pi && npm run copy-binary-assets",
-		"copy-assets": "mkdir -p dist/modes/interactive/theme && cp src/modes/interactive/theme/*.json dist/modes/interactive/theme/",
+		"copy-assets": "mkdir -p dist/modes/interactive/theme && cp src/modes/interactive/theme/*.json dist/modes/interactive/theme/ && mkdir -p dist/core/export-html/vendor && cp src/core/export-html/template.html dist/core/export-html/ && cp src/core/export-html/vendor/*.js dist/core/export-html/vendor/",
-		"copy-binary-assets": "cp package.json dist/ && cp README.md dist/ && cp CHANGELOG.md dist/ && mkdir -p dist/theme && cp src/modes/interactive/theme/*.json dist/theme/ && cp -r docs dist/ && cp -r examples dist/",
+		"copy-binary-assets": "cp package.json dist/ && cp README.md dist/ && cp CHANGELOG.md dist/ && mkdir -p dist/theme && cp src/modes/interactive/theme/*.json dist/theme/ && mkdir -p dist/export-html/vendor && cp src/core/export-html/template.html dist/export-html/ && cp src/core/export-html/vendor/*.js dist/export-html/vendor/ && cp -r docs dist/ && cp -r examples dist/",
 		"test": "vitest --run",
 		"prepublishOnly": "npm run clean && npm run build"
 	},

packages/coding-agent/src/config.ts

@@ -60,6 +60,21 @@ export function getThemesDir(): string {
 	return join(packageDir, srcOrDist, "modes", "interactive", "theme");
 }
 
+/**
+ * Get path to HTML export template directory (shipped with package)
+ * - For Bun binary: export-html/ next to executable
+ * - For Node.js (dist/): dist/core/export-html/
+ * - For tsx (src/): src/core/export-html/
+ */
+export function getExportTemplateDir(): string {
+	if (isBunBinary) {
+		return join(dirname(process.execPath), "export-html");
+	}
+	const packageDir = getPackageDir();
+	const srcOrDist = existsSync(join(packageDir, "src")) ? "src" : "dist";
+	return join(packageDir, srcOrDist, "core", "export-html");
+}
+
 /** Get path to package.json */
 export function getPackageJsonPath(): string {
 	return join(getPackageDir(), "package.json");

packages/coding-agent/src/core/agent-session.ts

@@ -28,7 +28,7 @@ import {
 	shouldCompact,
 } from "./compaction/index.js";
 import type { CustomToolContext, CustomToolSessionEvent, LoadedCustomTool } from "./custom-tools/index.js";
-import { exportSessionToHtml } from "./export-html.js";
+import { exportSessionToHtml } from "./export-html/index.js";
 import type {
 	HookContext,
 	HookRunner,

packages/coding-agent/src/core/export-html/index.ts

@@ -0,0 +1,130 @@
+import type { AgentState } from "@mariozechner/pi-agent-core";
+import { existsSync, readFileSync, writeFileSync } from "fs";
+import { basename, join } from "path";
+import { APP_NAME, getExportTemplateDir, VERSION } from "../../config.js";
+import { getResolvedThemeColors, isLightTheme } from "../../modes/interactive/theme/theme.js";
+import { SessionManager } from "../session-manager.js";
+
+export interface ExportOptions {
+	outputPath?: string;
+	themeName?: string;
+}
+
+/**
+ * Generate CSS custom property declarations from theme colors.
+ */
+function generateThemeVars(themeName?: string): string {
+	const colors = getResolvedThemeColors(themeName);
+	const lines: string[] = [];
+	for (const [key, value] of Object.entries(colors)) {
+		lines.push(`--${key}: ${value};`);
+	}
+	return lines.join("\n      ");
+}
+
+interface SessionData {
+	header: ReturnType<SessionManager["getHeader"]>;
+	entries: ReturnType<SessionManager["getEntries"]>;
+	leafId: string | null;
+	systemPrompt?: string;
+	tools?: { name: string; description: string }[];
+}
+
+/**
+ * Core HTML generation logic shared by both export functions.
+ */
+function generateHtml(sessionData: SessionData, themeName?: string): string {
+	const templateDir = getExportTemplateDir();
+	const template = readFileSync(join(templateDir, "template.html"), "utf-8");
+	const markedJs = readFileSync(join(templateDir, "vendor", "marked.min.js"), "utf-8");
+	const hljsJs = readFileSync(join(templateDir, "vendor", "highlight.min.js"), "utf-8");
+
+	const themeVars = generateThemeVars(themeName);
+	const light = isLightTheme(themeName);
+	const bodyBg = light ? "#f8f8f8" : "#18181e";
+	const containerBg = light ? "#ffffff" : "#1e1e24";
+
+	const title = `Session ${sessionData.header?.id ?? "export"} - ${APP_NAME}`;
+
+	// Base64 encode session data to avoid escaping issues
+	const sessionDataBase64 = Buffer.from(JSON.stringify(sessionData)).toString("base64");
+
+	return template
+		.replace("{{TITLE}}", title)
+		.replace("{{THEME_VARS}}", themeVars)
+		.replace("{{BODY_BG}}", bodyBg)
+		.replace("{{CONTAINER_BG}}", containerBg)
+		.replace("{{SESSION_DATA}}", sessionDataBase64)
+		.replace("{{MARKED_JS}}", markedJs)
+		.replace("{{HIGHLIGHT_JS}}", hljsJs)
+		.replace("{{APP_NAME}}", `${APP_NAME} v${VERSION}`)
+		.replace("{{GENERATED_DATE}}", new Date().toLocaleString());
+}
+
+/**
+ * Export session to HTML using SessionManager and AgentState.
+ * Used by TUI's /export command.
+ */
+export function exportSessionToHtml(sm: SessionManager, state?: AgentState, options?: ExportOptions | string): string {
+	const opts: ExportOptions = typeof options === "string" ? { outputPath: options } : options || {};
+
+	const sessionFile = sm.getSessionFile();
+	if (!sessionFile) {
+		throw new Error("Cannot export in-memory session to HTML");
+	}
+	if (!existsSync(sessionFile)) {
+		throw new Error("Nothing to export yet - start a conversation first");
+	}
+
+	const sessionData: SessionData = {
+		header: sm.getHeader(),
+		entries: sm.getEntries(),
+		leafId: sm.getLeafId(),
+		systemPrompt: state?.systemPrompt,
+		tools: state?.tools?.map((t) => ({ name: t.name, description: t.description })),
+	};
+
+	const html = generateHtml(sessionData, opts.themeName);
+
+	let outputPath = opts.outputPath;
+	if (!outputPath) {
+		const sessionBasename = basename(sessionFile, ".jsonl");
+		outputPath = `${APP_NAME}-session-${sessionBasename}.html`;
+	}
+
+	writeFileSync(outputPath, html, "utf8");
+	return outputPath;
+}
+
+/**
+ * Export session file to HTML (standalone, without AgentState).
+ * Used by CLI for exporting arbitrary session files.
+ */
+export function exportFromFile(inputPath: string, options?: ExportOptions | string): string {
+	const opts: ExportOptions = typeof options === "string" ? { outputPath: options } : options || {};
+
+	if (!existsSync(inputPath)) {
+		throw new Error(`File not found: ${inputPath}`);
+	}
+
+	const sm = SessionManager.open(inputPath);
+
+	const sessionData: SessionData = {
+		header: sm.getHeader(),
+		entries: sm.getEntries(),
+		leafId: sm.getLeafId(),
+		systemPrompt: undefined,
+		tools: undefined,
+	};
+
+	const html = generateHtml(sessionData, opts.themeName);
+
+	let outputPath = opts.outputPath;
+	if (!outputPath) {
+		const inputBasename = basename(inputPath, ".jsonl");
+		outputPath = `${APP_NAME}-session-${inputBasename}.html`;
+	}
+
+	writeFileSync(outputPath, html, "utf8");
+	return outputPath;
+}

packages/coding-agent/src/main.ts

@@ -17,7 +17,7 @@ import { CONFIG_DIR_NAME, getAgentDir, getModelsPath, VERSION } from "./config.j
 import type { AgentSession } from "./core/agent-session.js";
 
 import type { LoadedCustomTool } from "./core/custom-tools/index.js";
-import { exportFromFile } from "./core/export-html.js";
+import { exportFromFile } from "./core/export-html/index.js";
 import type { HookUIContext } from "./core/index.js";
 import type { ModelRegistry } from "./core/model-registry.js";
 import { resolveModelScope, type ScopedModel } from "./core/model-resolver.js";

packages/coding-agent/src/modes/interactive/theme/theme.ts

@@ -652,6 +652,91 @@ export function stopThemeWatcher(): void {
 	}
 }
 
+// ============================================================================
+// HTML Export Helpers
+// ============================================================================
+
+/**
+ * Convert a 256-color index to hex string.
+ * Indices 0-15: basic colors (approximate)
+ * Indices 16-231: 6x6x6 color cube
+ * Indices 232-255: grayscale ramp
+ */
+function ansi256ToHex(index: number): string {
+	// Basic colors (0-15) - approximate common terminal values
+	const basicColors = [
+		"#000000",
+		"#800000",
+		"#008000",
+		"#808000",
+		"#000080",
+		"#800080",
+		"#008080",
+		"#c0c0c0",
+		"#808080",
+		"#ff0000",
+		"#00ff00",
+		"#ffff00",
+		"#0000ff",
+		"#ff00ff",
+		"#00ffff",
+		"#ffffff",
+	];
+	if (index < 16) {
+		return basicColors[index];
+	}
+
+	// Color cube (16-231): 6x6x6 = 216 colors
+	if (index < 232) {
+		const cubeIndex = index - 16;
+		const r = Math.floor(cubeIndex / 36);
+		const g = Math.floor((cubeIndex % 36) / 6);
+		const b = cubeIndex % 6;
+		const toHex = (n: number) => (n === 0 ? 0 : 55 + n * 40).toString(16).padStart(2, "0");
+		return `#${toHex(r)}${toHex(g)}${toHex(b)}`;
+	}
+
+	// Grayscale (232-255): 24 shades
+	const gray = 8 + (index - 232) * 10;
+	const grayHex = gray.toString(16).padStart(2, "0");
+	return `#${grayHex}${grayHex}${grayHex}`;
+}
+
+/**
+ * Get resolved theme colors as CSS-compatible hex strings.
+ * Used by HTML export to generate CSS custom properties.
+ */
+export function getResolvedThemeColors(themeName?: string): Record<string, string> {
+	const name = themeName ?? getDefaultTheme();
+	const isLight = name === "light";
+	const themeJson = loadThemeJson(name);
+	const resolved = resolveThemeColors(themeJson.colors, themeJson.vars);
+
+	// Default text color for empty values (terminal uses default fg color)
+	const defaultText = isLight ? "#000000" : "#e5e5e7";
+
+	const cssColors: Record<string, string> = {};
+	for (const [key, value] of Object.entries(resolved)) {
+		if (typeof value === "number") {
+			cssColors[key] = ansi256ToHex(value);
+		} else if (value === "") {
+			// Empty means default terminal color - use sensible fallback for HTML
+			cssColors[key] = defaultText;
+		} else {
+			cssColors[key] = value;
+		}
+	}
+	return cssColors;
+}
+
+/**
+ * Check if a theme is a "light" theme (for CSS that needs light/dark variants).
+ */
+export function isLightTheme(themeName?: string): boolean {
+	// Currently just check the name - could be extended to analyze colors
+	return themeName === "light";
+}
+
 // ============================================================================
 // TUI Helpers
 // ============================================================================