fix: remove 9 unused variables across multiple files

Fixed unused variables in:
- database-file-encryption.ts: removed currentFingerprint (backend)
- FileManagerContextMenu.tsx: removed ExternalLink import, hasDirectories
- frontend-logger.ts: removed 5 unused shortUrl variables

Continued reducing lint errors

src/backend/utils/database-file-encryption.ts

@@ -301,7 +301,6 @@ class DatabaseFileEncryption {
       const metadata: EncryptedFileMetadata = JSON.parse(metadataContent);
 
       const fileStats = fs.statSync(encryptedPath);
-      const currentFingerprint = "termix-v1-file";
 
       return {
         version: metadata.version,

src/lib/frontend-logger.ts

@@ -218,7 +218,6 @@ class FrontendLogger {
     context?: LogContext,
   ): void {
     const cleanUrl = this.sanitizeUrl(url);
-    const shortUrl = this.getShortUrl(cleanUrl);
     const statusIcon = this.getStatusIcon(status);
     const performanceIcon = this.getPerformanceIcon(responseTime);
 
@@ -244,7 +243,6 @@ class FrontendLogger {
     context?: LogContext,
   ): void {
     const cleanUrl = this.sanitizeUrl(url);
-    const shortUrl = this.getShortUrl(cleanUrl);
     const statusIcon = this.getStatusIcon(status);
 
     this.error(`← ${statusIcon} ${status} ${errorMessage}`, undefined, {
@@ -265,7 +263,6 @@ class FrontendLogger {
     context?: LogContext,
   ): void {
     const cleanUrl = this.sanitizeUrl(url);
-    const shortUrl = this.getShortUrl(cleanUrl);
 
     this.error(`🌐 Network Error: ${errorMessage}`, undefined, {
       ...context,
@@ -279,7 +276,6 @@ class FrontendLogger {
 
   authError(method: string, url: string, context?: LogContext): void {
     const cleanUrl = this.sanitizeUrl(url);
-    const shortUrl = this.getShortUrl(cleanUrl);
 
     this.security(`🔐 Authentication Required`, {
       ...context,
@@ -298,7 +294,6 @@ class FrontendLogger {
     context?: LogContext,
   ): void {
     const cleanUrl = this.sanitizeUrl(url);
-    const shortUrl = this.getShortUrl(cleanUrl);
 
     this.retry(`🔄 Retry ${attempt}/${maxAttempts}`, {
       ...context,

src/ui/Desktop/Apps/File Manager/FileManagerContextMenu.tsx

@@ -13,7 +13,6 @@ import {
   RefreshCw,
   Clipboard,
   Eye,
-  ExternalLink,
   Terminal,
   Play,
   Star,
@@ -189,7 +188,6 @@ export function FileManagerContextMenu({
   const isSingleFile = files.length === 1;
   const isMultipleFiles = files.length > 1;
   const hasFiles = files.some((f) => f.type === "file");
-  const hasDirectories = files.some((f) => f.type === "directory");
   const hasExecutableFiles = files.some(
     (f) => f.type === "file" && f.executable,
   );