feat: add PWA support with service worker and update prompt

- Updated package.json to include vite-plugin-pwa and workbox-window.
- Added icon SVGs for PWA: icon-512.svg and maskable-512.svg.
- Created a manifest.json for PWA configuration.
- Implemented PwaUpdatePrompt component to notify users of available updates.
- Enhanced CookieConsent and SiteAssistant components for better layout and responsiveness.
- Updated global CSS for safe-area insets and mobile-first enhancements.
- Registered service worker in usePwaRegistration hook for managing updates.
- Modified Vite configuration to integrate PWA features and caching strategies.

frontend/src/components/tools/ChatPdf.tsx

@@ -95,7 +95,7 @@ export default function ChatPdf() {
                   <textarea
                     value={question} onChange={(e) => setQuestion(e.target.value)}
                     placeholder={t('tools.chatPdf.questionPlaceholder')}
-                    rows={3}
+                    rows={2}
                     className="w-full rounded-lg border border-slate-300 px-3 py-2 text-sm dark:border-slate-600 dark:bg-slate-700 dark:text-slate-200"
                   />
                 </div>