feat: finished all open things up to and including phase 6

MLXServerTests/Server/ImageDecoderTests.swift

@@ -1,3 +1,4 @@
+import MLXLMCommon
 import XCTest
 @testable import MLX_Server
 
@@ -15,4 +16,24 @@ final class ImageDecoderTests: XCTestCase {
         XCTAssertNotNil(image)
         XCTAssertGreaterThanOrEqual(image?.estimatedBytes ?? 0, 4)
     }
+
+    func testDecodeJPEGDataURI() {
+        let image = ImageDecoder.decode(TestImageFixtures.primaryJPEGDataURI)
+
+        XCTAssertNotNil(image)
+        XCTAssertGreaterThanOrEqual(image?.estimatedBytes ?? 0, 64 * 64 * 4)
+    }
+
+    func testDecodeLarge4KDataURI() throws {
+        let image = try XCTUnwrap(ImageDecoder.decode(TestImageFixtures.largeDataURI))
+
+        XCTAssertGreaterThanOrEqual(image.estimatedBytes, 4_096 * 4_096 * 4)
+
+        if case .ciImage(let ciImage) = image.image {
+            XCTAssertEqual(Int(ciImage.extent.width), 4_096)
+            XCTAssertEqual(Int(ciImage.extent.height), 4_096)
+        } else {
+            XCTFail("Expected CIImage-backed decoded image")
+        }
+    }
 }