fix(auth): Improve file-based auth handling and consistency

internal/watcher/watcher.go

@@ -526,8 +526,14 @@ func (w *Watcher) SnapshotCoreAuths() []*coreauth.Auth {
 		if email, _ := metadata["email"].(string); email != "" {
 			label = email
 		}
+		// Use relative path under authDir as ID to stay consistent with FileStore
+		id := full
+		if rel, errRel := filepath.Rel(w.authDir, full); errRel == nil && rel != "" {
+			id = rel
+		}
+
 		a := &coreauth.Auth{
-			ID:       full,
+			ID:       id,
 			Provider: provider,
 			Label:    label,
 			Status:   coreauth.StatusActive,

sdk/cliproxy/auth/filestore.go

@@ -64,6 +64,15 @@ func (s *FileStore) Save(ctx context.Context, auth *Auth) error {
 	if path == "" {
 		return fmt.Errorf("auth filestore: missing file path attribute for %s", auth.ID)
 	}
+	// If the auth has been disabled and the original file was removed, avoid
+	// recreating it on disk. This lets operators delete auth files explicitly.
+	if auth.Disabled {
+		if _, err := os.Stat(path); err != nil {
+			if os.IsNotExist(err) {
+				return nil
+			}
+		}
+	}
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {