Add favicon

Pulse-line mark in the status-yellow accent, on both the status page and /admin. Wires up static file serving and fixes the Dockerfile to actually ship the public/ dir into the runtime image.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/adminPage.ts

@@ -5,6 +5,7 @@ export function renderAdminPage(): string {
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>admin / status</title>
+  <link rel="icon" type="image/svg+xml" href="/favicon.svg">
   <style>
     @import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&display=swap');
     :root {

src/index.ts

@@ -7,6 +7,7 @@ import { router as adminRouter } from './admin.js';
 
 const app = express();
 app.use(express.json());
+app.use(express.static('public'));
 
 app.get('/api/status', (_req, res) => {
   res.json(getStore());

src/page.ts

@@ -34,6 +34,7 @@ export function renderPage(store: StatusStore): string {
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta http-equiv="refresh" content="60">
   <title>status / goonk</title>
+  <link rel="icon" type="image/svg+xml" href="/favicon.svg">
   <style>
     @import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&display=swap');
     :root {