🏷️ fix: Increment Tag Counters When Forking/Duplicating Conversations (#9737)

* fix: increment tag counters when forking/duplicating conversations

- Add bulkIncrementTagCounts to update existing tag counts in bulk
- Integrate tag count updates into importBatchBuilder.saveBatch() using Promise.all
- Update frontend mutations to directly update cache instead of invalidating queries
- Optimize bulkIncrementTagCounts to skip unnecessary database queries

Fixes issue where forked/duplicated conversations with bookmarks would not increment
tag counters, leading to negative counts when bookmarks were later removed.

* chore: reorder import statements for clarity in fork.spec.js

api/server/utils/import/importBatchBuilder.js

@@ -1,5 +1,6 @@
 const { v4: uuidv4 } = require('uuid');
 const { EModelEndpoint, Constants, openAISettings } = require('librechat-data-provider');
+const { bulkIncrementTagCounts } = require('~/models/ConversationTag');
 const { bulkSaveConvos } = require('~/models/Conversation');
 const { bulkSaveMessages } = require('~/models/Message');
 const { logger } = require('~/config');
@@ -93,13 +94,22 @@ class ImportBatchBuilder {
 
   /**
    * Saves the batch of conversations and messages to the DB.
+   * Also increments tag counts for any existing tags.
    * @returns {Promise<void>} A promise that resolves when the batch is saved.
    * @throws {Error} If there is an error saving the batch.
    */
   async saveBatch() {
     try {
-      await bulkSaveConvos(this.conversations);
-      await bulkSaveMessages(this.messages, true);
+      const promises = [];
+      promises.push(bulkSaveConvos(this.conversations));
+      promises.push(bulkSaveMessages(this.messages, true));
+      promises.push(
+        bulkIncrementTagCounts(
+          this.requestUserId,
+          this.conversations.flatMap((convo) => convo.tags),
+        ),
+      );
+      await Promise.all(promises);
       logger.debug(
         `user: ${this.requestUserId} | Added ${this.conversations.length} conversations and ${this.messages.length} messages to the DB.`,
       );