H-16: align takeover with channel AI workflow (#2)

* feat(conversations): complete manual AI takeover

* fix(conversations): align AI takeover flow with channel AI

* fix(conversations): close takeover review gaps

---------

Co-authored-by: Rogee <rogee@ipao.vip>

frontend/app/javascript/dashboard/composables/chatlist/useBulkActions.js

@@ -59,25 +59,13 @@ export function useBulkActions() {
   // Same method used in context menu, conversationId being passed from there.
   async function onAssignAgent(agent, conversationId = null) {
     try {
-      if (conversationId && agent.assignee_type === 'AgentBot') {
-        await Promise.all(
-          conversationId.map(id =>
-            store.dispatch('assignAgent', {
-              conversationId: id,
-              agentId: agent.id,
-              assigneeType: agent.assignee_type,
-            })
-          )
-        );
-      } else {
-        await store.dispatch('bulkActions/process', {
-          type: 'Conversation',
-          ids: conversationId || selectedConversations.value,
-          fields: {
-            assignee_id: agent.id,
-          },
-        });
-      }
+      await store.dispatch('bulkActions/process', {
+        type: 'Conversation',
+        ids: conversationId || selectedConversations.value,
+        fields: {
+          assignee_id: agent.id,
+        },
+      });
       store.dispatch('bulkActions/clearSelectedConversationIds');
       if (conversationId) {
         useAlert(