feat: Add filtering for system files in FilePreview component

- Implemented  function in  to filter out  and similar system files.
- Updated rendering logic to ensure ignored files are not displayed in the frontend.
- Ensured consistency with backend filtering logic for a seamless user experience.

This change improves the frontend by preventing unnecessary or system files from being

frontend/src/components/FilePreview.js

@@ -19,8 +19,40 @@ export function formatDuration(seconds) {
   return `${mins}:${secs.toString().padStart(2, '0')}`;
 }
 
+// Hilfsfunktion zum Überprüfen ob eine Datei ignoriert werden soll
+export function shouldIgnoreFile(filename) {
+  const ignoredFiles = [
+    '.DS_Store',        // macOS System file
+    'Thumbs.db',        // Windows Thumbnail cache
+    'desktop.ini',      // Windows Desktop configuration
+    '.gitignore',       // Git configuration
+    '.gitkeep',         // Git placeholder
+    'config.yaml',      // Configuration files
+    'config.yml',
+    'setup.yaml',
+    'setup.yml',
+    '.htaccess',        // Apache configuration
+    'web.config',       // IIS configuration
+    '.env',             // Environment variables
+    '.env.local',
+    'README.md',        // Documentation
+    'readme.txt',
+    'license.txt',
+    'LICENSE'
+  ];
+  
+  return ignoredFiles.some(ignored => 
+    filename.toLowerCase() === ignored.toLowerCase()
+  );
+}
+
 // Datei-Vorschau-Komponente mit sofortiger Zoom-Skalierung und Loading-State
 export default function FilePreview({ file, zoom = 1, darkMode = false }) {
+  // Frühe Rückgabe für ignorierte Dateien
+  if (shouldIgnoreFile(file.name)) {
+    return null;
+  }
+  
   const [loaded, setLoaded] = React.useState(false);
   const width = file.width || 300;
   const height = file.height || 200;
@@ -173,6 +205,10 @@ export default function FilePreview({ file, zoom = 1, darkMode = false }) {
         </div>
       );
     }
+    // Sonstige Datei: Prüfen ob ignoriert werden soll
+    if (shouldIgnoreFile(file.name)) {
+      return null; // Ignorierte Dateien nicht anzeigen
+    }
     // Sonstige Datei: Link
     return (
       <a href={file.url} target="_blank" rel="noopener noreferrer">{file.name}</a>