Fix SiJava import error - replace with SiOracle

- Replace non-existent SiJava with SiOracle for Java files
- Oracle is the owner of Java, making it an appropriate icon choice
- All imported icons now exist and should work correctly
- Maintain red color scheme for Java files

src/ui/Desktop/Apps/File Manager/components/FileViewer.tsx

@@ -21,7 +21,7 @@ import {
   SiJavascript,
   SiTypescript,
   SiPython,
-  SiJava,
+  SiOracle,
   SiCplusplus,
   SiC,
   SiDotnet,
@@ -91,7 +91,7 @@ function getLanguageIcon(filename: string): React.ReactNode {
     'ts': <SiTypescript className="w-6 h-6 text-blue-500" />,
     'tsx': <SiTypescript className="w-6 h-6 text-blue-500" />,
     'py': <SiPython className="w-6 h-6 text-blue-400" />,
-    'java': <SiJava className="w-6 h-6 text-red-500" />,
+    'java': <SiOracle className="w-6 h-6 text-red-500" />,
     'cpp': <SiCplusplus className="w-6 h-6 text-blue-600" />,
     'c': <SiC className="w-6 h-6 text-blue-700" />,
     'cs': <SiDotnet className="w-6 h-6 text-purple-600" />,