Strip metadata in the ExifTool worker during upload preview.

Cache stripped blobs, show original vs stripped metadata tabs, and keep user-facing errors on fixed store messages with console logging for diagnostics.

frontend/src/utils/toArrayBuffer.ts

@@ -0,0 +1,15 @@
+export function toArrayBuffer(data: unknown): ArrayBuffer | null {
+    if (data instanceof ArrayBuffer) {
+        return data;
+    }
+
+    if (data instanceof Uint8Array) {
+        const { buffer, byteOffset, byteLength } = data;
+
+        if (buffer instanceof ArrayBuffer) {
+            return buffer.slice(byteOffset, byteOffset + byteLength);
+        }
+    }
+
+    return null;
+}