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/composables/useCaptain.js

@@ -0,0 +1,46 @@
+import { computed } from 'vue';
+import { useStore } from 'dashboard/composables/store.js';
+import { useAccount } from 'dashboard/composables/useAccount';
+import { useCamelCase } from 'dashboard/composables/useTransformKeys';
+import { FEATURE_FLAGS } from 'dashboard/featureFlags';
+
+export function useCaptain() {
+  const store = useStore();
+  const { isCloudFeatureEnabled, currentAccount } = useAccount();
+
+  const captainEnabled = computed(() => {
+    return isCloudFeatureEnabled(FEATURE_FLAGS.CAPTAIN);
+  });
+
+  const captainLimits = computed(() => {
+    return currentAccount.value?.limits?.captain;
+  });
+
+  const documentLimits = computed(() => {
+    if (captainLimits.value?.documents) {
+      return useCamelCase(captainLimits.value.documents);
+    }
+
+    return null;
+  });
+
+  const responseLimits = computed(() => {
+    if (captainLimits.value?.responses) {
+      return useCamelCase(captainLimits.value.responses);
+    }
+
+    return null;
+  });
+
+  const fetchLimits = () => {
+    store.dispatch('accounts/limits');
+  };
+
+  return {
+    captainEnabled,
+    captainLimits,
+    documentLimits,
+    responseLimits,
+    fetchLimits,
+  };
+}