refactor(jwt_auth_token_service): optimize logging in validateToken and invalidateToken methods

- Replace multiple _log method calls with chained calls using .. operator
- Consolidate log statements in JwtAuthTokenService class
- Improve code readability and reduce line count for better maintainability

Author: fulleni

lib/src/services/jwt_auth_token_service.dart

@@ -165,8 +165,8 @@ class JwtAuthTokenService implements AuthTokenService {
       // Fetch the full user object from the repository
       // This ensures the user still exists and is valid
       final user = await _userRepository.read(id: userId);
-      _log.finer('[validateToken] User repository read successful for ID: $userId');
-      _log.info('[validateToken] Token validated successfully for user ${user.id}');
+      _log..finer('[validateToken] User repository read successful for ID: $userId')
+      ..info('[validateToken] Token validated successfully for user ${user.id}');
       return user;
     } on JWTExpiredException catch (e, s) {
       _log.warning('[validateToken] Token expired.', e, s);
@@ -243,10 +243,10 @@ class JwtAuthTokenService implements AuthTokenService {
         expClaim * 1000,
         isUtc: true,
       );
-      _log.finer('[invalidateToken] Extracted expiry: $expiryDateTime');
+      _log..finer('[invalidateToken] Extracted expiry: $expiryDateTime')
 
       // 4. Add JTI to the blacklist
-      _log.finer('[invalidateToken] Adding jti $jti to blacklist...');
+      ..finer('[invalidateToken] Adding jti $jti to blacklist...');
       await _blacklistService.blacklist(jti, expiryDateTime);
       _log.info('[invalidateToken] Token (jti: $jti) successfully blacklisted.');
     } on JWTException catch (e, s) {