offline mode fixes

src-tauri/src/jellyfin/http_client.rs

@@ -217,6 +217,45 @@ impl HttpClient {
             .map_err(|e| format!("Failed to parse JSON: {}", e))
     }
 
+    /// Make a GET request and deserialize JSON with a short timeout and no retries.
+    ///
+    /// Intended for the initial "connect to server" probe on the login screen:
+    /// a wrong/unreachable URL must fail fast instead of burning through the
+    /// default 30s-per-attempt timeout and exponential backoff retries.
+    pub async fn get_json_fast<T: DeserializeOwned>(&self, url: &str) -> Result<T, String> {
+        // Short timeout so an unreachable host fails quickly.
+        const FAST_TIMEOUT: Duration = Duration::from_secs(10);
+
+        let request = self
+            .client
+            .get(url)
+            .timeout(FAST_TIMEOUT)
+            .build()
+            .map_err(|e| format!("Failed to build request: {}", e))?;
+
+        // No retry: connection failures on a wrong URL won't succeed on retry,
+        // they'd only multiply the wait the user sees before an error.
+        let response = self
+            .client
+            .execute(request)
+            .await
+            .map_err(|e| format!("Request failed: {}", e))?;
+
+        if !response.status().is_success() {
+            let status = response.status();
+            let error_text = response
+                .text()
+                .await
+                .unwrap_or_else(|_| "Unknown error".to_string());
+            return Err(format!("HTTP {}: {}", status, error_text));
+        }
+
+        response
+            .json::<T>()
+            .await
+            .map_err(|e| format!("Failed to parse JSON: {}", e))
+    }
+
     /// Quick ping to check if a server is reachable (no retry)
     pub async fn ping(&self, url: &str) -> bool {
         let request = self.client.get(url)