feat: show app version in sidebar, remove version from about page

Displays the app version below the Elysium title in the sidebar.
Removes the separate client/API version cards from the About panel.
Also fixes the Vite dev proxy port to match the API server.

apps/web/src/components/game/AboutPanel.tsx

@@ -101,17 +101,6 @@ export const AboutPanel = (): React.JSX.Element => {
     <section className="panel about-panel">
       <h2>ℹ️ About</h2>
 
-      <div className="about-versions">
-        <div className="about-version-card">
-          <span className="about-version-label">🌐 Client Version</span>
-          <span className="about-version-value">{__WEB_VERSION__}</span>
-        </div>
-        <div className="about-version-card">
-          <span className="about-version-label">⚙️ API Version</span>
-          <span className="about-version-value">{about?.apiVersion ?? "Loading..."}</span>
-        </div>
-      </div>
-
       <h3 className="stats-section-header">📋 Changelog</h3>
       {error !== null && <p className="about-error">{error}</p>}
       {about === null && error === null && <p className="about-loading">Loading changelog...</p>}