🧹 chore: Remove Deprecated BingAI Code & Address Mobile Focus (#5565)

* chore: remove all bing code

* chore: remove bing code and auto-focus effects

* chore: add back escapeRegExp helper function for regex special character handling

* chore: remove deprecated fields from settings and conversation schema

* fix: ensure default endpoint is set correctly in conversation setup

* feat: add disableFocus option to newConversation for improved search behavior

api/models/schema/defaults.js

@@ -1,5 +1,5 @@
 const conversationPreset = {
-  // endpoint: [azureOpenAI, openAI, bingAI, anthropic, chatGPTBrowser]
+  // endpoint: [azureOpenAI, openAI, anthropic, chatGPTBrowser]
   endpoint: {
     type: String,
     default: null,
@@ -61,19 +61,6 @@ const conversationPreset = {
     type: Number,
     required: false,
   },
-  // for bingai only
-  jailbreak: {
-    type: Boolean,
-  },
-  context: {
-    type: String,
-  },
-  systemMessage: {
-    type: String,
-  },
-  toneStyle: {
-    type: String,
-  },
   file_ids: { type: [{ type: String }], default: undefined },
   // deprecated
   resendImages: {