feat: simplify Early Access update check and add unit test

Author: x0x0b

StabilityMatrix.Core/Services/ModelIndexService.cs

@@ -720,18 +720,6 @@ private static bool GetHasEarlyAccessUpdateOnly(LocalModelFile model, CivitModel
         if (installedIndex <= 0)
             return false;
 
-        var hasEarlyAccess = false;
-        for (var i = 0; i < installedIndex; i++)
-        {
-            if (versions[i].IsEarlyAccess)
-            {
-                hasEarlyAccess = true;
-                continue;
-            }
-
-            return false;
-        }
-
-        return hasEarlyAccess;
+        return versions.Take(installedIndex).All(version => version.IsEarlyAccess);
     }
 }

StabilityMatrix.Tests/Core/ModelIndexServiceTests.cs

@@ -68,6 +68,21 @@ public void GetHasEarlyAccessUpdateOnly_ReturnsFalse_WhenModelHasNoUpdate()
         Assert.IsFalse(result);
     }
 
+    [TestMethod]
+    public void GetHasEarlyAccessUpdateOnly_ReturnsFalse_WhenInstalledVersionIsNotInRemoteList()
+    {
+        var model = CreateLocalModel(installedVersionId: 100, hasUpdate: true);
+        var remoteModel = CreateRemoteModel(
+            CreateVersion(id: 300, isEarlyAccess: true),
+            CreateVersion(id: 200, isEarlyAccess: true),
+            CreateVersion(id: 150, isEarlyAccess: false)
+        );
+
+        var result = InvokeGetHasEarlyAccessUpdateOnly(model, remoteModel);
+
+        Assert.IsFalse(result);
+    }
+
     private static bool InvokeGetHasEarlyAccessUpdateOnly(LocalModelFile model, CivitModel? remoteModel)
     {
         var method = typeof(ModelIndexService).GetMethod(