Add player functionality with HLS support and API integration

- Implemented a new Player class in player.js to handle audio playback, including HLS support using hls.js.
- Created a shared API module in api.js for making HTTP requests with proper error handling.
- Added DOM utility functions in dom.js for creating and clearing elements.
- Introduced WebSocket connection handling in ws.js for real-time updates.
- Developed a comprehensive CSS stylesheet for styling the application, including a high-contrast theme.

web/shared/api.js

@@ -0,0 +1,21 @@
+async function http(method, path, body) {
+  const res = await fetch(path, {
+    method,
+    credentials: 'same-origin',
+    headers: body ? { 'Content-Type': 'application/json' } : {},
+    body: body ? JSON.stringify(body) : undefined
+  });
+  if (res.status === 204) return null;
+  const ct = res.headers.get('content-type') || '';
+  const data = ct.includes('json') ? await res.json() : await res.text();
+  if (!res.ok) throw Object.assign(new Error(data?.error || res.statusText), { status: res.status, data });
+  return data;
+}
+
+export const api = {
+  get: (p) => http('GET', p),
+  post: (p, b) => http('POST', p, b),
+  put: (p, b) => http('PUT', p, b),
+  patch: (p, b) => http('PATCH', p, b),
+  del: (p) => http('DELETE', p)
+};