feat: Add manual WhatsApp templates sync with UI (#12007)

Fixes https://github.com/chatwoot/chatwoot/issues/9600

**Summary**
- Added manual WhatsApp templates sync functionality accessible via UI
- Added refresh button in both inbox settings and template picker modal
- Enhanced template picker to always show for WhatsApp Cloud channels
(even when empty)


**Preview**

<img width="1456" height="798" alt="CleanShot 2025-07-22 at 14 15 28@2x"
src="https://github.com/user-attachments/assets/8a04ff26-61fa-42ee-a1b8-5e06433ae6e0"
/>


<img width="2376" height="1574" alt="CleanShot 2025-07-22 at 14 19
24@2x"
src="https://github.com/user-attachments/assets/1c772034-04ff-484d-88dd-ca8123e93065"
/>

---------

Co-authored-by: iamsivin <iamsivin@gmail.com>

app/javascript/dashboard/store/modules/specs/inboxes/actions.spec.js

@@ -231,4 +231,28 @@ describe('#actions', () => {
       ).rejects.toThrow(Error);
     });
   });
+
+  describe('#syncTemplates', () => {
+    it('sends correct API call when sync is successful', async () => {
+      axios.post.mockResolvedValue({
+        data: { message: 'Template sync initiated successfully' },
+      });
+
+      await actions.syncTemplates({ commit }, 123);
+
+      expect(axios.post).toHaveBeenCalledWith(
+        '/api/v1/inboxes/123/sync_templates'
+      );
+    });
+
+    it('throws error when API call fails', async () => {
+      const errorMessage =
+        'Template sync is only available for WhatsApp channels';
+      axios.post.mockRejectedValue(new Error(errorMessage));
+
+      await expect(actions.syncTemplates({ commit }, 123)).rejects.toThrow(
+        errorMessage
+      );
+    });
+  });
 });