🎨 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/hooks/common/useIsMobile.js

@@ -32,4 +32,4 @@ export const useIsMobile = () => {
     () => window.matchMedia(query).matches,
     () => false,
   );
-}; 
+};