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/i18n/locale/en/settings.json

@@ -265,7 +265,7 @@
     "CAPTAIN": "Captain",
     "CAPTAIN_ASSISTANTS": "Assistants",
     "CAPTAIN_DOCUMENTS": "Documents",
-    "CAPTAIN_RESPONSES" : "FAQs",
+    "CAPTAIN_RESPONSES": "FAQs",
     "HOME": "Home",
     "AGENTS": "Agents",
     "AGENT_BOTS": "Bots",
@@ -327,15 +327,27 @@
   },
   "BILLING_SETTINGS": {
     "TITLE": "Billing",
+    "DESCRIPTION": "Manage your subscription here, upgrade your plan and get more for your team.",
     "CURRENT_PLAN": {
       "TITLE": "Current Plan",
-      "PLAN_NOTE": "You are currently subscribed to the **{plan}** plan with **{quantity}** licenses"
+      "PLAN_NOTE": "You are currently subscribed to the **{plan}** plan with **{quantity}** licenses",
+      "SEAT_COUNT": "Number of seats",
+      "RENEWS_ON": "Renews on"
     },
+    "VIEW_PRICING": "View Pricing",
     "MANAGE_SUBSCRIPTION": {
       "TITLE": "Manage your subscription",
       "DESCRIPTION": "View your previous invoices, edit your billing details, or cancel your subscription.",
       "BUTTON_TXT": "Go to the billing portal"
     },
+    "CAPTAIN": {
+      "TITLE": "Captain",
+      "DESCRIPTION": "Manage usage and credits for Captain AI.",
+      "BUTTON_TXT": "Buy more credits",
+      "DOCUMENTS": "Documents",
+      "RESPONSES": "Responses",
+      "UPGRADE": "Captain is not available on the free plan, upgrade now to get access to assistants, copilot and more."
+    },
     "CHAT_WITH_US": {
       "TITLE": "Need help?",
       "DESCRIPTION": "Do you face any issues in billing? We are here to help.",