Libraries: refresh the list after any sync that changes it

Only syncs started from the UI updated the list. One started in the backend, such as the sync after creating a library, left it stale: the new library kept saying it wasn't on the server yet, and Main stayed undeletable until the app reloaded. A sync that changes the libraries now emits an event the app refreshes on.

src-tauri/src/sync.rs

@@ -47,7 +47,7 @@ use mtgc_core::sync::remote::{
 };
 use mtgc_core::sync::{self as core_sync, LibraryDoc, MergeReport};
 use serde::Serialize;
-use tauri::{AppHandle, Manager};
+use tauri::{AppHandle, Emitter, Manager};
 
 use crate::state::{AppState, LocalLibrary, SyncAccount};
 
@@ -585,6 +585,11 @@ async fn run_sync(app: AppHandle, choice: Option<FirstSync>) -> Result<Option<Sy
         Err(e) => s.sync_error = Some(e.clone()),
     }
     drop(s);
+    // An event rather than the report alone: many syncs start here in the
+    // backend, with nothing in the UI waiting on their result.
+    if result.as_ref().is_ok_and(|r| r.libraries_changed) {
+        let _ = app.emit("libraries-changed", ());
+    }
     crate::logged("sync_now", result).map(Some)
 }
 

src/App.tsx

@@ -515,6 +515,18 @@ export default function App() {
     if (statusLoaded) refreshLibraries();
   }, [statusLoaded, refreshLibraries]);
 
+  // A sync linked, downloaded, renamed or flagged a library — the open one's
+  // name in the top bar included.
+  useEffect(() => {
+    const un = listen("libraries-changed", () => {
+      refreshLibraries();
+      api.getStatus().then(setStatus).catch(() => {});
+    });
+    return () => {
+      un.then((f) => f());
+    };
+  }, [refreshLibraries]);
+
   /** Another library was opened, or the list changed: the open library may
    *  be a different one now, so everything refetches. */
   const librariesChanged = useCallback(
@@ -544,18 +556,12 @@ export default function App() {
         }
         setDeckRefreshSignal((v) => v + 1);
       }
-      if (report?.libraries_changed) {
-        // Downloaded, renamed or deleted elsewhere — the open one's name in
-        // the top bar included.
-        refreshLibraries();
-        api.getStatus().then(setStatus).catch(() => {});
-      }
       return report;
     } finally {
       setSyncing(false);
       api.syncStatus().then(setSync).catch(() => {});
     }
-  }, [refreshLibraries]);
+  }, []);
 
   // Automatic sync, whenever signed in (and not waiting on the first-sync
   // choice): once now, on every trip to or from the background — leaving