refactor: consolidate project structure by migrating authentication, identity, and shared UI components while removing legacy Web Client files.

src/NexusReader.Infrastructure.Mobile/Services/MauiStorageService.cs

@@ -68,4 +68,42 @@ public sealed class MauiStorageService : INativeStorageService
             return Result.Fail(ex.Message);
         }
     }
+
+    public async Task<Result> SaveSecureString(string key, string value)
+    {
+        try
+        {
+            await SecureStorage.Default.SetAsync(key, value);
+            return Result.Ok();
+        }
+        catch (Exception ex)
+        {
+            return Result.Fail(ex.Message);
+        }
+    }
+
+    public async Task<Result<string?>> GetSecureString(string key)
+    {
+        try
+        {
+            return Result.Ok(await SecureStorage.Default.GetAsync(key));
+        }
+        catch (Exception ex)
+        {
+            return Result.Fail(ex.Message);
+        }
+    }
+
+    public Result RemoveSecure(string key)
+    {
+        try
+        {
+            SecureStorage.Default.Remove(key);
+            return Result.Ok();
+        }
+        catch (Exception ex)
+        {
+            return Result.Fail(ex.Message);
+        }
+    }
 }