revert: "chore: Replace messageMixing with useMessage composable [CW-3475]" (#10011)

Reverts chatwoot/chatwoot#9942

This was causing the widget email input to break

app/javascript/widget/composables/specs/useMessage.spec.js

@@ -1,71 +0,0 @@
-import { describe, it, expect } from 'vitest';
-import { reactive, nextTick } from 'vue';
-import { useMessage } from '../useMessage';
-
-describe('useMessage', () => {
-  it('should handle deleted messages', () => {
-    const message = reactive({
-      content_attributes: { deleted: true },
-      attachments: [],
-    });
-
-    const { messageContentAttributes, hasAttachments } = useMessage(message);
-
-    expect(messageContentAttributes.value).toEqual({ deleted: true });
-    expect(hasAttachments.value).toBe(false);
-  });
-
-  it('should handle non-deleted messages with attachments', () => {
-    const message = reactive({
-      content_attributes: {},
-      attachments: ['attachment1', 'attachment2'],
-    });
-
-    const { messageContentAttributes, hasAttachments } = useMessage(message);
-
-    expect(messageContentAttributes.value).toEqual({});
-    expect(hasAttachments.value).toBe(true);
-  });
-
-  it('should handle messages without content_attributes', () => {
-    const message = reactive({
-      attachments: [],
-    });
-
-    const { messageContentAttributes, hasAttachments } = useMessage(message);
-
-    expect(messageContentAttributes.value).toEqual({});
-    expect(hasAttachments.value).toBe(false);
-  });
-
-  it('should handle messages with empty attachments array', () => {
-    const message = reactive({
-      content_attributes: { someAttribute: 'value' },
-      attachments: [],
-    });
-
-    const { messageContentAttributes, hasAttachments } = useMessage(message);
-
-    expect(messageContentAttributes.value).toEqual({ someAttribute: 'value' });
-    expect(hasAttachments.value).toBe(false);
-  });
-
-  it('should update reactive properties when message changes', async () => {
-    const message = reactive({
-      content_attributes: {},
-      attachments: [],
-    });
-
-    const { messageContentAttributes, hasAttachments } = useMessage(message);
-
-    expect(messageContentAttributes.value).toEqual({});
-    expect(hasAttachments.value).toBe(false);
-
-    message.content_attributes = { updated: true };
-    message.attachments.push('newAttachment');
-    await nextTick();
-
-    expect(messageContentAttributes.value).toEqual({ updated: true });
-    expect(hasAttachments.value).toBe(true);
-  });
-});