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/components/widgets/WootWriter/ReplyBottomPanel.vue

@@ -94,7 +94,7 @@ export default {
       type: Boolean,
       default: true,
     },
-    hasWhatsappTemplates: {
+    enableWhatsAppTemplates: {
       type: Boolean,
       default: false,
     },
@@ -333,7 +333,7 @@ export default {
         @click="toggleMessageSignature"
       />
       <NextButton
-        v-if="hasWhatsappTemplates"
+        v-if="enableWhatsAppTemplates"
         v-tooltip.top-end="$t('CONVERSATION.FOOTER.WHATSAPP_TEMPLATES')"
         icon="i-ph-whatsapp-logo"
         slate