fix: resolve all Rust test compile warnings without suppression

Remove unused imports and a dead test helper, and strengthen tests that
held unused bindings/fields so the values are actually exercised:
- drop unused imports (HttpConfig, MediaType, std::io::Write)
- remove unused TestEventEmitter::clear helper
- replace meaningless size_of asserts with real empty-manager checks
- assert on MockTrack.name in sorting tests

src-tauri/src/commands/player/mod.rs

@@ -1796,6 +1796,7 @@ mod tests {
         // Test finding track 1 (should be index 0)
         let index1 = tracks.iter().position(|t| t.id == "track1");
         assert_eq!(index1, Some(0), "Track 1 should be at index 0");
+        assert_eq!(tracks[0].name, "Song 1", "Track at index 0 should carry its name");
 
         // Test finding track 3 (should be index 2)
         let index3 = tracks.iter().position(|t| t.id == "track3");
@@ -1869,6 +1870,7 @@ mod tests {
 
         // Verify all tracks are in correct order
         assert_eq!(tracks[0].id, "id1");
+        assert_eq!(tracks[0].name, "Track 1", "Sorted track should retain its name");
         assert_eq!(tracks[1].id, "id2");
         assert_eq!(tracks[2].id, "id3");
         assert_eq!(tracks[3].id, "id4");

src-tauri/src/commands/repository.rs

@@ -499,16 +499,16 @@ mod tests {
     #[test]
     fn test_repository_manager_creation() {
         let manager = RepositoryManager::new();
-        // Should be able to create RepositoryManager without panicking
-        assert_eq!(std::mem::size_of::<RepositoryManager>() > 0, true);
+        // A freshly created manager holds no repositories
+        assert!(manager.get("any-handle").is_none());
     }
 
     #[test]
     fn test_repository_manager_wrapper_structure() {
         let manager = RepositoryManager::new();
         let wrapper = RepositoryManagerWrapper(manager);
-        // Verify wrapper holds the manager
-        assert_eq!(std::mem::size_of::<RepositoryManagerWrapper>() > 0, true);
+        // The wrapper exposes the underlying manager, which starts empty
+        assert!(wrapper.0.get("any-handle").is_none());
     }
 
     #[test]

src-tauri/src/connectivity/mod.rs

@@ -349,7 +349,6 @@ impl ConnectivityMonitorHandle {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::jellyfin::http_client::HttpConfig;
 
     #[test]
     fn test_intervals() {

src-tauri/src/download/mod.rs

@@ -120,7 +120,6 @@ pub struct DownloadTask {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::player::MediaType;
 
     #[test]
     fn test_download_manager_set_max_concurrent() {

src-tauri/src/player/events.rs

@@ -172,10 +172,6 @@ mod tests {
         pub fn events(&self) -> Vec<PlayerStatusEvent> {
             self.events.lock_safe().clone()
         }
-
-        pub fn clear(&self) {
-            self.events.lock_safe().clear();
-        }
     }
 
     impl PlayerEventEmitter for TestEventEmitter {

src-tauri/src/thumbnail/cache.rs

@@ -344,7 +344,6 @@ mod tests {
     use super::*;
     use crate::storage::db_service::RusqliteService;
     use rusqlite::Connection;
-    use std::io::Write;
     use std::sync::{Arc, Mutex};
     use tempfile::TempDir;