Remove UI window hooks and wire explicit runtime callbacks

wwwroot/js/data.js

@@ -126,9 +126,3 @@ export function signatureSuggestions(list) {
         ]),
     );
 }
-
-// expose for UI handlers that call back in
-window.refreshPhaseData = refreshPhaseData;
-window.loadSuggestData = loadSuggestData;
-window.loadVoteData = loadVoteData;
-window.handleAuthError = (err) => handleAuthError(err, clearUserState);