feat: Add frontend changes for Captain limits (#10749)

This PR introduces several improvements to the Captain AI dashboard
section:

- New billing page, with new colors, layout and meters for Captain usage
- Updated the base paywall component to use new colors
- Updated PageLayout.vue, it's more generic and can be used for other
pages as well
   - Use flags to toggle empty state and loading state
- Add prop for `featureFlag` to show the paywall slot based on feature
enabled on account
- Update `useAccount` to add a `isCloudFeatureEnabled`
- **Removed feature flag checks from captain route definitions**, so the
captain entry will always be visible on the sidebar
- Add banner to Captain pages for the following cases
   - Responses usage is over 80%
   - Documents limit is fully exhausted


### Screenshots

<details><summary>Free plan</summary>
<p>

![CleanShot 2025-01-22 at 18 37
11@2x](https://github.com/user-attachments/assets/17d3ddba-9095-4e81-9b6f-45b5f69e6a3f)
![CleanShot 2025-01-22 at 18 37
04@2x](https://github.com/user-attachments/assets/df9bb0a6-085f-45da-97d4-74cbcc33fc7e)


</p>
</details> 

<details><summary>Paid plan</summary>
<p>

![CleanShot 2025-01-22 at 18 36
45@2x](https://github.com/user-attachments/assets/a7ccf9d4-143b-49e4-8149-83c7a7985023)

![CleanShot 2025-01-22 at 20 23
57@2x](https://github.com/user-attachments/assets/c6ce35ba-e537-486d-85c8-4cc2d4e76438)


</p>
</details>

---------

Co-authored-by: Sojan Jose <sojan@pepalo.com>
Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/components-next/captain/pageComponents/Paywall.vue

@@ -0,0 +1,41 @@
+<script setup>
+import { computed } from 'vue';
+import { useRouter } from 'vue-router';
+import { useMapGetter } from 'dashboard/composables/store';
+import { useAccount } from 'dashboard/composables/useAccount';
+
+import BasePaywallModal from 'dashboard/routes/dashboard/settings/components/BasePaywallModal.vue';
+
+const router = useRouter();
+const currentUser = useMapGetter('getCurrentUser');
+
+const isSuperAdmin = computed(() => {
+  return currentUser.value.type === 'SuperAdmin';
+});
+const { accountId, isOnChatwootCloud } = useAccount();
+
+const i18nKey = computed(() =>
+  isOnChatwootCloud.value ? 'PAYWALL' : 'ENTERPRISE_PAYWALL'
+);
+const openBilling = () => {
+  router.push({
+    name: 'billing_settings_index',
+    params: { accountId: accountId.value },
+  });
+};
+</script>
+
+<template>
+  <div
+    class="w-full max-w-[960px] mx-auto h-full max-h-[448px] grid place-content-center"
+  >
+    <BasePaywallModal
+      class="mx-auto"
+      feature-prefix="CAPTAIN"
+      :i18n-key="i18nKey"
+      :is-super-admin="isSuperAdmin"
+      :is-on-chatwoot-cloud="isOnChatwootCloud"
+      @upgrade="openBilling"
+    />
+  </div>
+</template>