fix(test): disambiguate mock upload call after ByteArray overload

The new ByteArray upload overload on DesktopBlossomClient made the
positional any() mock call ambiguous. Specify explicit type parameters.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

desktopApp/src/jvmTest/kotlin/com/vitorpamplona/amethyst/desktop/service/upload/DesktopUploadOrchestratorTest.kt

@@ -153,7 +153,7 @@ class DesktopUploadOrchestratorTest {
             val mockClient = mockk<DesktopBlossomClient>()
 
             coEvery {
-                mockClient.upload(any(), any(), any(), any())
+                mockClient.upload(any<java.io.File>(), any<String>(), any<String>(), any())
             } returns BlossomUploadResult(url = "https://example.com/hash")
 
             val orchestrator = DesktopUploadOrchestrator(mockClient)