fix(ui): preserve default in thinking cycle (#3153)

packages/ui/src/hooks/useKeyboardShortcuts.ts

@@ -273,16 +273,16 @@ export const useKeyboardShortcuts = () => {
       if (state.isSettingsDialogOpen || hasOverlay) return false;
       const config = useConfigStore.getState();
       if (config.getCurrentModelVariants().length === 0) return false;
-      config.cycleCurrentVariant();
+      const nextVariantOverride = config.cycleCurrentVariant();
       const sessionId = useSessionUIStore.getState().currentSessionId;
-      const { currentVariant, currentAgentName, currentProviderId, currentModelId } = useConfigStore.getState();
+      const { currentAgentName, currentProviderId, currentModelId } = useConfigStore.getState();
       if (sessionId && currentAgentName && currentProviderId && currentModelId) {
         useSelectionStore.getState().saveAgentModelVariantForSession(
           sessionId,
           currentAgentName,
           currentProviderId,
           currentModelId,
-          currentVariant,
+          nextVariantOverride,
         );
       }
     },

packages/ui/src/hooks/useMiniChatKeyboardShortcuts.ts

@@ -71,10 +71,9 @@ export const useMiniChatKeyboardShortcuts = () => {
       const configState = useConfigStore.getState();
       if (configState.getCurrentModelVariants().length === 0) return false;
 
-      configState.cycleCurrentVariant();
+      const nextVariantOverride = configState.cycleCurrentVariant();
       const sessionId = useSessionUIStore.getState().currentSessionId;
       const {
-        currentVariant,
         currentAgentName,
         currentProviderId,
         currentModelId,
@@ -85,7 +84,7 @@ export const useMiniChatKeyboardShortcuts = () => {
           currentAgentName,
           currentProviderId,
           currentModelId,
-          currentVariant,
+          nextVariantOverride,
         );
       }
     },