🎨 chore(web): apply ESLint and Prettier auto-fixes (baseline)

- Ran: bun run eslint:fix && bun run lint:fix
- Inserted AGPL license header via eslint-plugin-header
- Enforced no-multiple-empty-lines and other lint rules
- Formatted code using Prettier v3 (@so1ve/prettier-config)
- No functional changes; formatting-only baseline across JS/JSX files

web/src/context/Theme/index.jsx

@@ -17,7 +17,13 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
 For commercial licensing, please contact support@quantumnous.com
 */
 
-import { createContext, useCallback, useContext, useState, useEffect } from 'react';
+import {
+  createContext,
+  useCallback,
+  useContext,
+  useState,
+  useEffect,
+} from 'react';
 
 const ThemeContext = createContext(null);
 export const useTheme = () => useContext(ThemeContext);
@@ -31,7 +37,9 @@ export const useSetTheme = () => useContext(SetThemeContext);
 // 检测系统主题偏好
 const getSystemTheme = () => {
   if (typeof window !== 'undefined' && window.matchMedia) {
-    return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
+    return window.matchMedia('(prefers-color-scheme: dark)').matches
+      ? 'dark'
+      : 'light';
   }
   return 'light';
 };