Improve download viewer with grouping and inline previews

Group downloads and scraps by type in Entry and Release details

Add FileViewer component for .txt, .nfo, image, and PDF previews

Update download API to support inline view with correct MIME types

Signed-off-by: Junie@lucy.xalior.com

src/app/api/zxdb/download/route.ts

@@ -40,11 +40,29 @@ export async function GET(req: NextRequest) {
 
   const fileBuffer = fs.readFileSync(absolutePath);
   const fileName = path.basename(absolutePath);
+  const ext = path.extname(fileName).toLowerCase();
+
+  // Determine Content-Type
+  let contentType = "application/octet-stream";
+  if (ext === ".txt" || ext === ".nfo") {
+    contentType = "text/plain; charset=utf-8";
+  } else if (ext === ".png") {
+    contentType = "image/png";
+  } else if (ext === ".jpg" || ext === ".jpeg") {
+    contentType = "image/jpeg";
+  } else if (ext === ".gif") {
+    contentType = "image/gif";
+  } else if (ext === ".pdf") {
+    contentType = "application/pdf";
+  }
+
+  const isView = searchParams.get("view") === "1";
+  const disposition = isView ? "inline" : "attachment";
 
   return new NextResponse(fileBuffer, {
     headers: {
-      "Content-Type": "application/octet-stream",
-      "Content-Disposition": `attachment; filename="${fileName}"`,
+      "Content-Type": contentType,
+      "Content-Disposition": `${disposition}; filename="${fileName}"`,
       "Content-Length": stat.size.toString(),
     },
   });