Initial commit: modern React video player library

Add all source files for a feature-rich, reusable video player built with React, TypeScript, and Vite. Includes core components, context, hooks, utilities, styles, demo app, and configuration files.

src/components/controls/SettingsButton.tsx

@@ -0,0 +1,19 @@
+import React from 'react'
+import { usePlayerContext } from '../../contexts/PlayerContext'
+import { SettingsIcon } from '../../icons'
+import './ControlButton.css'
+
+export const SettingsButton: React.FC = () => {
+  const { toggleSettings } = usePlayerContext()
+
+  return (
+    <button
+      className="control-button settings-button"
+      onClick={toggleSettings}
+      aria-label="Settings"
+      title="Settings"
+    >
+      <SettingsIcon size={24} color="var(--player-text)" />
+    </button>
+  )
+}