feat: Added setEngineBaseUrl() to engine API client, created <kerf-embe…

- "app/src/api/engine.ts"
- "app/src/embed.tsx"
- "app/vite.embed.config.ts"
- "app/tsconfig.node.json"

GSD-Task: S03/T01

app/dist-embed/icons.svg

@@ -0,0 +1,24 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <symbol id="bluesky-icon" viewBox="0 0 16 17">
+    <g clip-path="url(#bluesky-clip)"><path fill="#08060d" d="M7.75 7.735c-.693-1.348-2.58-3.86-4.334-5.097-1.68-1.187-2.32-.981-2.74-.79C.188 2.065.1 2.812.1 3.251s.241 3.602.398 4.13c.52 1.744 2.367 2.333 4.07 2.145-2.495.37-4.71 1.278-1.805 4.512 3.196 3.309 4.38-.71 4.987-2.746.608 2.036 1.307 5.91 4.93 2.746 2.72-2.746.747-4.143-1.747-4.512 1.702.189 3.55-.4 4.07-2.145.156-.528.397-3.691.397-4.13s-.088-1.186-.575-1.406c-.42-.19-1.06-.395-2.741.79-1.755 1.24-3.64 3.752-4.334 5.099"/></g>
+    <defs><clipPath id="bluesky-clip"><path fill="#fff" d="M.1.85h15.3v15.3H.1z"/></clipPath></defs>
+  </symbol>
+  <symbol id="discord-icon" viewBox="0 0 20 19">
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+  </symbol>
+  <symbol id="documentation-icon" viewBox="0 0 21 20">
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+    <path fill="none" stroke="#aa3bff" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.35" d="M3 10a2.78 2.78 0 0 1 2.778-2.778c.555 0 1.209.097 1.748-.047.48-.129.854-.503.982-.982.145-.54.048-1.194.048-1.749a2.78 2.78 0 0 1 2.777-2.777"/>
+  </symbol>
+  <symbol id="github-icon" viewBox="0 0 19 19">
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+  </symbol>
+  <symbol id="social-icon" viewBox="0 0 20 20">
+    <path fill="none" stroke="#aa3bff" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.35" d="M12.5 6.667a4.167 4.167 0 1 0-8.334 0 4.167 4.167 0 0 0 8.334 0"/>
+    <path fill="none" stroke="#aa3bff" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.35" d="M2.5 16.667a5.833 5.833 0 0 1 8.75-5.053m3.837.474.513 1.035c.07.144.257.282.414.309l.93.155c.596.1.736.536.307.965l-.723.73a.64.64 0 0 0-.152.531l.207.903c.164.715-.213.991-.84.618l-.872-.52a.63.63 0 0 0-.577 0l-.872.52c-.624.373-1.003.094-.84-.618l.207-.903a.64.64 0 0 0-.152-.532l-.723-.729c-.426-.43-.289-.864.306-.964l.93-.156a.64.64 0 0 0 .412-.31l.513-1.034c.28-.562.735-.562 1.012 0"/>
+  </symbol>
+  <symbol id="x-icon" viewBox="0 0 19 19">
+    <path fill="#08060d" fill-rule="evenodd" d="M1.893 1.98c.052.072 1.245 1.769 2.653 3.77l2.892 4.114c.183.261.333.48.333.486s-.068.089-.152.183l-.522.593-.765.867-3.597 4.087c-.375.426-.734.834-.798.905a1 1 0 0 0-.118.148c0 .01.236.017.664.017h.663l.729-.83c.4-.457.796-.906.879-.999a692 692 0 0 0 1.794-2.038c.034-.037.301-.34.594-.675l.551-.624.345-.392a7 7 0 0 1 .34-.374c.006 0 .93 1.306 2.052 2.903l2.084 2.965.045.063h2.275c1.87 0 2.273-.003 2.266-.021-.008-.02-1.098-1.572-3.894-5.547-2.013-2.862-2.28-3.246-2.273-3.266.008-.019.282-.332 2.085-2.38l2-2.274 1.567-1.782c.022-.028-.016-.03-.65-.03h-.674l-.3.342a871 871 0 0 1-1.782 2.025c-.067.075-.405.458-.75.852a100 100 0 0 1-.803.91c-.148.172-.299.344-.99 1.127-.304.343-.32.358-.345.327-.015-.019-.904-1.282-1.976-2.808L6.365 1.85H1.8zm1.782.91 8.078 11.294c.772 1.08 1.413 1.973 1.425 1.984.016.017.241.02 1.05.017l1.03-.004-2.694-3.766L7.796 5.75 5.722 2.852l-1.039-.004-1.039-.004z" clip-rule="evenodd"/>
+  </symbol>
+</svg>

app/src/api/engine.ts

@@ -2,13 +2,28 @@
 
 import type { PresetsResponse, TraceResponse } from '../types/engine';
 
-const BASE = '/engine';
+let _baseUrl = '/engine';
+
+/**
+ * Override the engine API base URL.
+ * Used by the embed component to point at a remote engine origin.
+ * @example setEngineBaseUrl('https://kerf.example.com/engine')
+ */
+export function setEngineBaseUrl(url: string): void {
+  // Strip trailing slash for consistency
+  _baseUrl = url.replace(/\/+$/, '');
+}
+
+/** Return the current engine base URL. */
+function getBase(): string {
+  return _baseUrl;
+}
 
 /**
  * Fetch all available presets from the engine.
  */
 export async function getPresets(signal?: AbortSignal): Promise<PresetsResponse> {
-  const res = await fetch(`${BASE}/presets`, { signal });
+  const res = await fetch(`${getBase()}/presets`, { signal });
   if (!res.ok) {
     throw new Error(`GET /engine/presets failed: ${res.status} ${res.statusText}`);
   }
@@ -31,7 +46,7 @@ export async function traceImage(
   form.append('preset', preset);
   form.append('params', JSON.stringify(params));
 
-  const res = await fetch(`${BASE}/trace`, {
+  const res = await fetch(`${getBase()}/trace`, {
     method: 'POST',
     body: form,
     signal,
@@ -56,7 +71,7 @@ export async function simplifyVector(
   form.append('epsilon', String(epsilon));
   form.append('output_format', 'svg');
 
-  const res = await fetch(`${BASE}/simplify`, {
+  const res = await fetch(`${getBase()}/simplify`, {
     method: 'POST',
     body: form,
     signal,
@@ -90,7 +105,7 @@ export async function exportAsDxf(
   form.append('units', units);
   form.append('scale_factor', String(scaleFactor));
 
-  const res = await fetch(`${BASE}/simplify`, {
+  const res = await fetch(`${getBase()}/simplify`, {
     method: 'POST',
     body: form,
     signal,

app/src/embed.tsx

@@ -0,0 +1,120 @@
+/**
+ * <kerf-embed> — Self-contained Web Component for the Kerf vectorization app.
+ *
+ * Usage:
+ *   <kerf-embed engine-url="https://kerf.example.com/engine"></kerf-embed>
+ *
+ * All styles are isolated inside Shadow DOM. @font-face rules are hoisted
+ * to document.head because fonts declared in Shadow DOM don't reliably
+ * load cross-browser.
+ */
+
+import { createRoot } from 'react-dom/client';
+import { StrictMode } from 'react';
+import App from './App';
+import { setEngineBaseUrl } from './api/engine';
+
+// Vite ?inline imports — CSS is embedded as strings, not injected into <head>
+import indexCss from './index.css?inline';
+import appCss from './App.css?inline';
+
+/**
+ * Extract @font-face blocks from a CSS string.
+ * Returns [fontFaceRules, remainingCss].
+ */
+function extractFontFaces(css: string): [string, string] {
+  const fontFaceBlocks: string[] = [];
+  // Match @font-face { ... } — handles nested braces safely enough for our case
+  const regex = /@font-face\s*\{[^}]*\}/g;
+  let remaining = css;
+  let match: RegExpExecArray | null;
+  while ((match = regex.exec(css)) !== null) {
+    fontFaceBlocks.push(match[0]);
+  }
+  remaining = css.replace(regex, '').trim();
+  return [fontFaceBlocks.join('\n'), remaining];
+}
+
+/**
+ * Rewrite `:root` selectors to `:host` so CSS custom properties work
+ * inside Shadow DOM.
+ */
+function rewriteRootToHost(css: string): string {
+  return css.replace(/:root/g, ':host');
+}
+
+/** Inject @font-face rules into document.head (idempotent). */
+function injectFontFaces(fontFaceCss: string): void {
+  if (!fontFaceCss.trim()) return;
+  const id = 'kerf-embed-fonts';
+  if (document.getElementById(id)) return;
+  const style = document.createElement('style');
+  style.id = id;
+  style.textContent = fontFaceCss;
+  document.head.appendChild(style);
+}
+
+class KerfEmbed extends HTMLElement {
+  private _root: ReturnType<typeof createRoot> | null = null;
+
+  connectedCallback(): void {
+    // Read configurable engine URL before any rendering
+    const engineUrl = this.getAttribute('engine-url');
+    if (engineUrl) {
+      setEngineBaseUrl(engineUrl);
+    }
+
+    // Attach open Shadow DOM
+    const shadow = this.attachShadow({ mode: 'open' });
+
+    // Process App.css: extract @font-face → document.head, rest → shadow
+    const [fontFaceCss, appCssClean] = extractFontFaces(appCss);
+    injectFontFaces(fontFaceCss);
+
+    // Rewrite :root → :host for index.css custom properties
+    const indexCssRewritten = rewriteRootToHost(indexCss);
+
+    // Inject all styles into shadow root
+    const styleEl = document.createElement('style');
+    styleEl.textContent = `
+${indexCssRewritten}
+${appCssClean}
+
+/* Embed-specific overrides */
+:host {
+  display: block;
+  width: 100%;
+  box-sizing: border-box;
+}
+`;
+    shadow.appendChild(styleEl);
+
+    // Create mount point
+    const mountDiv = document.createElement('div');
+    mountDiv.id = 'root';
+    shadow.appendChild(mountDiv);
+
+    // Mount React app
+    this._root = createRoot(mountDiv);
+    this._root.render(
+      <StrictMode>
+        <App />
+      </StrictMode>,
+    );
+  }
+
+  disconnectedCallback(): void {
+    // Clean up React root on removal
+    if (this._root) {
+      this._root.unmount();
+      this._root = null;
+    }
+  }
+}
+
+// Register the custom element (guard against double-registration)
+if (!customElements.get('kerf-embed')) {
+  customElements.define('kerf-embed', KerfEmbed);
+}
+
+export { KerfEmbed };

app/tsconfig.node.json

@@ -22,5 +22,5 @@
     "noFallthroughCasesInSwitch": true,
     "noUncheckedSideEffectImports": true
   },
-  "include": ["vite.config.ts"]
+  "include": ["vite.config.ts", "vite.embed.config.ts"]
 }

app/vite.embed.config.ts

@@ -0,0 +1,42 @@
+/// <reference types="vite/client" />
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+import { resolve } from 'path';
+
+/**
+ * Vite library-mode config for the <kerf-embed> Web Component.
+ *
+ * Bundles everything (React, Konva, opentype.js) into a self-contained
+ * output — nothing is externalized. Outputs ES module + IIFE formats.
+ */
+export default defineConfig({
+  plugins: [react()],
+  build: {
+    outDir: 'dist-embed',
+    emptyOutDir: true,
+    lib: {
+      entry: resolve(__dirname, 'src/embed.tsx'),
+      name: 'KerfEmbed',
+      formats: ['es', 'iife'],
+      fileName: (format) => {
+        if (format === 'es') return 'kerf-embed.js';
+        return 'kerf-embed.iife.js';
+      },
+    },
+    // Don't inline CSS — extract to style.css for optional manual loading
+    cssCodeSplit: false,
+    rollupOptions: {
+      // Explicitly empty to prevent any auto-externalization
+      external: [],
+      output: {
+        // Prevent chunk splitting — single self-contained bundle
+        codeSplitting: false,
+        // Name the CSS output predictably
+        assetFileNames: (assetInfo) => {
+          if (assetInfo.names?.[0]?.endsWith('.css')) return 'style.css';
+          return assetInfo.names?.[0] ?? '[name][extname]';
+        },
+      },
+    },
+  },
+});