Enhance collection and group suggestions to manage existing items visibility

Updated the CollectionSuggestions and GroupSuggestions components to include a toggle for displaying already created suggestions. Introduced new state management for handling visibility of existing items, along with localization updates for relevant UI strings in both English and Russian. This improves user experience by allowing admins to see both new and existing suggestions clearly.

frontend/src/shared/lib/locales/en.ts

@@ -126,6 +126,9 @@ export const en = {
         stats: '{{shows}} shows · {{units}} units',
         exists: 'already exists',
         created: 'Group created',
+        allCreated: 'Every suggestion has been created already.',
+        showExisting: 'Show already created ({{count}})',
+        hideExisting: 'Hide already created',
         kinds: {
           Genre: 'genre',
           ShowKind: 'kind',
@@ -172,6 +175,9 @@ export const en = {
         parts: '{{count}} parts',
         exists: 'already exists',
         created: 'Collection created',
+        allCreated: 'Every suggestion has been created already.',
+        showExisting: 'Show already created ({{count}})',
+        hideExisting: 'Hide already created',
         sources: { Metadata: 'from metadata', NameGuess: 'by names' },
       },
     },