refactor: bundle export-html templates instead of reading from node_modules

- Copy templates from pi-coding-agent into src/auto-reply/reply/export-html/
- Add build script to copy templates to dist/
- Remove fragile node_modules path traversal
- Templates are now self-contained (~250KB total)

scripts/copy-export-html-templates.ts

@@ -0,0 +1,59 @@
+#!/usr/bin/env tsx
+/**
+ * Copy export-html templates from src to dist
+ */
+
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const projectRoot = path.resolve(__dirname, "..");
+
+const srcDir = path.join(projectRoot, "src", "auto-reply", "reply", "export-html");
+const distDir = path.join(projectRoot, "dist", "export-html");
+
+function copyExportHtmlTemplates() {
+  if (!fs.existsSync(srcDir)) {
+    console.warn("[copy-export-html-templates] Source directory not found:", srcDir);
+    return;
+  }
+
+  // Create dist directory
+  if (!fs.existsSync(distDir)) {
+    fs.mkdirSync(distDir, { recursive: true });
+  }
+
+  // Copy main template files
+  const templateFiles = ["template.html", "template.css", "template.js"];
+  for (const file of templateFiles) {
+    const srcFile = path.join(srcDir, file);
+    const distFile = path.join(distDir, file);
+    if (fs.existsSync(srcFile)) {
+      fs.copyFileSync(srcFile, distFile);
+      console.log(`[copy-export-html-templates] Copied ${file}`);
+    }
+  }
+
+  // Copy vendor files
+  const srcVendor = path.join(srcDir, "vendor");
+  const distVendor = path.join(distDir, "vendor");
+  if (fs.existsSync(srcVendor)) {
+    if (!fs.existsSync(distVendor)) {
+      fs.mkdirSync(distVendor, { recursive: true });
+    }
+    const vendorFiles = fs.readdirSync(srcVendor);
+    for (const file of vendorFiles) {
+      const srcFile = path.join(srcVendor, file);
+      const distFile = path.join(distVendor, file);
+      if (fs.statSync(srcFile).isFile()) {
+        fs.copyFileSync(srcFile, distFile);
+        console.log(`[copy-export-html-templates] Copied vendor/${file}`);
+      }
+    }
+  }
+
+  console.log("[copy-export-html-templates] Done");
+}
+
+copyExportHtmlTemplates();