feat: outbound voice call essentials (#12782)

- Enables outbound voice calls in voice channel . We are only caring
about wiring the logic to trigger outgoing calls to the call button
introduced in previous PRs. We will connect it to call component in
subsequent PRs

ref: #11602 

## Screens

<img width="2304" height="1202" alt="image"
src="https://github.com/user-attachments/assets/b91543a8-8d4e-4229-bd80-9727b42c7b0f"
/>

<img width="2304" height="1200" alt="image"
src="https://github.com/user-attachments/assets/1a1dad2a-8cb2-4aa2-9702-c062416556a7"
/>

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Vishnu Narayanan <vishnu@chatwoot.com>

app/javascript/dashboard/store/modules/contacts/actions.js

@@ -302,4 +302,22 @@ export const actions = {
   clearContactFilters({ commit }) {
     commit(types.CLEAR_CONTACT_FILTERS);
   },
+
+  initiateCall: async ({ commit }, { contactId, inboxId }) => {
+    commit(types.SET_CONTACT_UI_FLAG, { isInitiatingCall: true });
+    try {
+      const response = await ContactAPI.initiateCall(contactId, inboxId);
+      commit(types.SET_CONTACT_UI_FLAG, { isInitiatingCall: false });
+      return response.data;
+    } catch (error) {
+      commit(types.SET_CONTACT_UI_FLAG, { isInitiatingCall: false });
+      if (error.response?.data?.message) {
+        throw new ExceptionWithMessage(error.response.data.message);
+      } else if (error.response?.data?.error) {
+        throw new ExceptionWithMessage(error.response.data.error);
+      } else {
+        throw new Error(error);
+      }
+    }
+  },
 };

app/javascript/dashboard/store/modules/contacts/index.js

@@ -17,6 +17,7 @@ const state = {
     isDeleting: false,
     isExporting: false,
     isImporting: false,
+    isInitiatingCall: false,
   },
   sortOrder: [],
   appliedFilters: [],