not there yet but has potential

src/core/jellyfin.rs

@@ -190,6 +190,9 @@ impl JellyfinClient {
         if let Some(term) = query.search_term.as_deref() {
             req = req.query(&[("SearchTerm", term)]);
         }
+        if let Some(filters) = query.filters.as_deref() {
+            req = req.query(&[("Filters", filters)]);
+        }
 
         let resp = req.send().map_err(|e| format!("request failed: {e}"))?;
 
@@ -209,7 +212,28 @@ impl JellyfinClient {
         })
     }
 
-    pub fn playlist_items(
+/// Returns true if there exists at least one resumable Episode under the given parent (Series or Season).
+/// This is used to mark Series/Season rows as "in progress" even when Jellyfin doesn't populate
+/// PlayedPercentage on those container types.
+pub fn has_resumable_under(
+    &self,
+    user_id: &str,
+    parent_id: &str,
+) -> Result<bool, String> {
+    // Series -> Season -> Episode, so this MUST be recursive for Series.
+    // Recursive=true is also fine for Season.
+    let mut q = LibraryQuery::all()
+        .with_parent(parent_id.to_string())
+        .with_item_types("Episode")
+        .with_filters("IsResumable");
+
+    q.recursive = true;
+
+    let page = self.list_items(user_id, q, 0, 1)?;
+    Ok(page.total > 0)
+}
+
+pub fn playlist_items(
         &self,
         user_id: &str,
         playlist_id: &str,
@@ -255,6 +279,7 @@ pub struct LibraryQuery {
     pub parent_id: Option<String>,          // e.g. Some(series_id)
     pub search_term: Option<String>,        // e.g. Some("matrix".into())
     pub recursive: bool,                    // true for big lists, false for drilldown
+    pub filters: Option<String>,            // e.g. Some("IsResumable".into())
 }
 
 impl LibraryQuery {
@@ -264,6 +289,7 @@ impl LibraryQuery {
             parent_id: None,
             search_term: None,
             recursive: true,
+            filters: None,
         }
     }
     pub fn shows() -> Self {
@@ -272,6 +298,7 @@ impl LibraryQuery {
             parent_id: None,
             search_term: None,
             recursive: true,
+            filters: None,
         }
     }
     pub fn music() -> Self {
@@ -280,6 +307,7 @@ impl LibraryQuery {
             parent_id: None,
             search_term: None,
             recursive: true,
+            filters: None,
         }
     }
 
@@ -290,6 +318,7 @@ impl LibraryQuery {
             parent_id: None,
             search_term: None,
             recursive: true,
+            filters: None,
         }
     }
 
@@ -308,6 +337,11 @@ impl LibraryQuery {
         self.include_item_types = Some(types.into());
         self
     }
+
+    pub fn with_filters(mut self, filters: impl Into<String>) -> Self {
+        self.filters = Some(filters.into());
+        self
+    }
 }