offline mode almost there

src/core/jellyfin.rs

@@ -2,6 +2,8 @@ use serde::{Deserialize, Serialize};
 
 use super::config::Config;
 
+use std::time::Duration;
+
 #[derive(Clone)]
 pub struct JellyfinClient {
     base_url: String,
@@ -112,6 +114,35 @@ impl JellyfinClient {
         })
     }
 
+    pub fn ping_base_url(base_url: &str) -> bool {
+        // Fast, unauthenticated check. Latch result at startup.
+        // We try a couple endpoints because Jellyfin setups vary.
+        let base = base_url.trim_end_matches('/');
+
+        let client = match reqwest::blocking::Client::builder()
+            .timeout(Duration::from_millis(900))
+            .build()
+        {
+            Ok(c) => c,
+            Err(_) => return false,
+        };
+
+        let candidates = [
+            format!("{base}/System/Ping"),
+            format!("{base}/System/Info/Public"),
+        ];
+
+        for url in candidates {
+            if let Ok(resp) = client.get(url).send() {
+                if resp.status().is_success() {
+                    return true;
+                }
+            }
+        }
+
+        false
+    }
+
     pub fn list_views(&self, user_id: &str) -> Result<Vec<JfItem>, String> {
         let url = format!("{}/Users/{}/Views", self.base_url, user_id);