Many improvemtns and fixes related to decoupling of svelte and rust on android.

src-tauri/src/repository/online.rs

@@ -36,6 +36,29 @@ impl OnlineRepository {
         HttpClient::build_auth_header(Some(&self.access_token), "jellytau-device")
     }
 
+    /// Download raw bytes from a URL using the shared authenticated HTTP client.
+    /// Used by thumbnail cache to download images with proper auth and connection reuse.
+    pub async fn download_bytes(&self, url: &str) -> Result<Vec<u8>, String> {
+        let request = self.http_client.client.get(url)
+            .header("X-Emby-Authorization", self.auth_header())
+            .build()
+            .map_err(|e| format!("Failed to build request: {}", e))?;
+
+        let response = self.http_client.request_with_retry(request).await
+            .map_err(|e| format!("Download failed: {}", e))?;
+
+        if !response.status().is_success() {
+            let status = response.status();
+            let body = response.text().await.unwrap_or_default();
+            let body_preview = if body.len() > 200 { &body[..200] } else { &body };
+            return Err(format!("HTTP {} ({})", status, body_preview.trim()));
+        }
+
+        response.bytes().await
+            .map(|b| b.to_vec())
+            .map_err(|e| format!("Failed to read bytes: {}", e))
+    }
+
     /// Make authenticated GET request
     async fn get_json<T: for<'de> Deserialize<'de>>(&self, endpoint: &str) -> Result<T, RepoError> {
         let url = format!("{}{}", self.server_url, endpoint);
@@ -1005,8 +1028,12 @@ impl MediaRepository for OnlineRepository {
             image_type.as_str()
         );
 
+        // Authentication is handled by X-Emby-Authorization header in download_bytes()
+        // Do NOT include api_key here — some Jellyfin servers reject requests when
+        // api_key is present but the token doesn't match the expected format.
+        let mut params: Vec<String> = Vec::new();
+
         if let Some(opts) = options {
-            let mut params = Vec::new();
             if let Some(width) = opts.max_width {
                 params.push(format!("maxWidth={}", width));
             }
@@ -1019,11 +1046,11 @@ impl MediaRepository for OnlineRepository {
             if let Some(tag) = opts.tag {
                 params.push(format!("tag={}", tag));
             }
+        }
 
-            if !params.is_empty() {
-                url.push('?');
-                url.push_str(&params.join("&"));
-            }
+        if !params.is_empty() {
+            url.push('?');
+            url.push_str(&params.join("&"));
         }
 
         url