fix: allow larger file uploads

src/routes/+page.svelte

@@ -15,27 +15,14 @@
 
     async function uploadStudySpace() {
         const imageFile = fileInput?.files?.[0];
-        const imageB64 = imageFile
-            ? await new Promise<string>((resolve) => {
-                  const reader = new FileReader();
-                  reader.onload = () => resolve(reader.result as string);
-                  reader.readAsDataURL(imageFile);
-              })
-            : null;
-        if (!imageB64 || !imageFile) {
+        if (!imageFile) {
             alert("Please select an image file.");
             return;
         }
-        const res = await fetch("/api/study_spaces", {
+        const params = new URLSearchParams({ title, imgTitle: imageFile.name });
+        const res = await fetch(`/api/study_spaces?${params.toString()}`, {
             method: "POST",
-            headers: {
-                "Content-Type": "application/json"
-            },
-            body: JSON.stringify({
-                title,
-                img: imageB64,
-                imgTitle: imageFile.name
-            })
+            body: imageFile
         });
         if (res.ok) {
             alert("Study space uploaded successfully!");