fix(manager): stop opening dialog for legacy-only commands and localize install button label

useManagerState.ts:
- Remove managerDialog.show(ManagerTab.All) from the isLegacyOnly branch;
  when a command has no NEW_UI equivalent the toast alone should be shown
  and the manager must not open
- Convert ManagerTab import to import type since it is now type-only
PackInstallButton.vue:
- Remove hardcoded default 'Install' from the label prop so computedLabel
  can reach its i18n fallback (t('g.install') / t('manager.installSelected'));
  the previous default made that branch permanently dead code

src/workbench/extensions/manager/components/manager/button/PackInstallButton.vue

@@ -35,7 +35,7 @@ type NodePack = components['schemas']['Node']
 const {
   nodePacks,
   isLoading = false,
-  label = 'Install',
+  label,
   size = 'sm',
   hasConflict,
   conflictInfo

src/workbench/extensions/manager/composables/useManagerState.ts

@@ -8,7 +8,7 @@ import { useSettingsDialog } from '@/platform/settings/composables/useSettingsDi
 import { useCommandStore } from '@/stores/commandStore'
 import { useSystemStatsStore } from '@/stores/systemStatsStore'
 import { useManagerDialog } from '@/workbench/extensions/manager/composables/useManagerDialog'
-import { ManagerTab } from '@/workbench/extensions/manager/types/comfyManagerTypes'
+import type { ManagerTab } from '@/workbench/extensions/manager/types/comfyManagerTypes'
 
 export enum ManagerUIState {
   DISABLED = 'disabled',
@@ -182,14 +182,12 @@ export function useManagerState() {
 
       case ManagerUIState.NEW_UI:
         if (options?.isLegacyOnly) {
-          // Legacy command is not available in NEW_UI mode
           useToastStore().add({
             severity: 'error',
             summary: t('g.error'),
             detail: t('manager.legacyMenuNotAvailable'),
             life: 3000
           })
-          managerDialog.show(ManagerTab.All)
         } else {
           managerDialog.show(options?.initialTab, options?.initialPackId)
         }