fix: robustly handle large file change batches in watch mode

Ensured all watcher and sync goroutines and channels are robustly closed on context cancellation or error.
Added explicit logging for large batches and context cancellation to prevent stuck processes and ensure graceful shutdown on Ctrl-C.

Signed-off-by: Amol Yadav <amyssnipet@yahoo.com>

pkg/compose/watch.go

@@ -355,6 +355,8 @@ func (s *composeService) watchEvents(ctx context.Context, project *types.Project
 		select {
 		case <-ctx.Done():
 			options.LogTo.Log(api.WatchLogger, "Watch disabled")
+			// Ensure watcher is closed to release resources
+			_ = watcher.Close()
 			return nil
 		case err, open := <-watcher.Errors():
 			if err != nil {
@@ -363,13 +365,28 @@ func (s *composeService) watchEvents(ctx context.Context, project *types.Project
 			if open {
 				continue
 			}
+			_ = watcher.Close()
 			return err
-		case batch := <-batchEvents:
+		case batch, ok := <-batchEvents:
+			if !ok {
+				options.LogTo.Log(api.WatchLogger, "Watch disabled")
+				_ = watcher.Close()
+				return nil
+			}
+			if len(batch) > 1000 {
+				logrus.Warnf("Very large batch of file changes detected: %d files. This may impact performance.", len(batch))
+				options.LogTo.Log(api.WatchLogger, "Large batch of file changes detected. If you just switched branches, this is expected.")
+			}
 			start := time.Now()
 			logrus.Debugf("batch start: count[%d]", len(batch))
 			err := s.handleWatchBatch(ctx, project, options, batch, rules, syncer)
 			if err != nil {
 				logrus.Warnf("Error handling changed files: %v", err)
+				// If context was canceled, exit immediately
+				if ctx.Err() != nil {
+					_ = watcher.Close()
+					return ctx.Err()
+				}
 			}
 			logrus.Debugf("batch complete: duration[%s] count[%d]", time.Since(start), len(batch))
 		}