add: infinitely scrolling timelines

crates/app/src/routes/api/v1/uploads.rs

@@ -12,7 +12,20 @@ pub async fn get_request(
 ) -> impl IntoResponse {
     let data = &(data.read().await).0;
 
-    let upload = data.get_upload_by_id(id).await.unwrap();
+    let upload = match data.get_upload_by_id(id).await {
+        Ok(u) => u,
+        Err(_) => {
+            return Err((
+                [("Content-Type", "image/svg+xml")],
+                Body::from(read_image(PathBufD::current().extend(&[
+                    data.0.0.dirs.media.as_str(),
+                    "images",
+                    "default-avatar.svg",
+                ]))),
+            ));
+        }
+    };
+
     let path = upload.path(&data.0.0);
 
     if !exists(&path).unwrap() {