FIX: Resolve keyboard shortcuts and enhance image preview with i18n support

- Fix keyboard shortcut conflicts in FileViewer.tsx (Ctrl+F, H, ?, Space, A)
- Add comprehensive i18n translations for keyboard shortcuts help panel
- Integrate react-photo-view for enhanced fullscreen image viewing
- Simplify image preview by removing complex toolbar and hover hints
- Add proper error handling and loading states for image display
- Update English and Chinese translation files with new keyboard shortcut terms

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

package-lock.json

@@ -75,6 +75,7 @@
         "react-hook-form": "^7.60.0",
         "react-i18next": "^15.7.3",
         "react-icons": "^5.5.0",
+        "react-photo-view": "^1.2.7",
         "react-resizable-panels": "^3.0.3",
         "react-simple-keyboard": "^3.8.120",
         "react-xtermjs": "^1.0.10",
@@ -13762,6 +13763,16 @@
         "react": "*"
       }
     },
+    "node_modules/react-photo-view": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/react-photo-view/-/react-photo-view-1.2.7.tgz",
+      "integrity": "sha512-MfOWVPxuibncRLaycZUNxqYU8D9IA+rbGDDaq6GM8RIoGJal592hEJoRAyRSI7ZxyyJNJTLMUWWL3UIXHJJOpw==",
+      "license": "Apache-2.0",
+      "peerDependencies": {
+        "react": ">=16.8.0",
+        "react-dom": ">=16.8.0"
+      }
+    },
     "node_modules/react-remove-scroll": {
       "version": "2.7.1",
       "resolved": "https://registry.npmjs.org/react-remove-scroll/-/react-remove-scroll-2.7.1.tgz",