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/banner/Banner.vue

@@ -0,0 +1,73 @@
+<script setup>
+import { computed } from 'vue';
+
+const props = defineProps({
+  color: {
+    type: String,
+    default: 'slate',
+    validator: value =>
+      ['blue', 'ruby', 'amber', 'slate', 'teal'].includes(value),
+  },
+  actionLabel: {
+    type: String,
+    default: null,
+  },
+});
+
+const emit = defineEmits(['action']);
+
+const bannerClass = computed(() => {
+  const classMap = {
+    slate: 'bg-n-slate-3 border-n-slate-4 text-n-slate-11',
+    amber: 'bg-n-amber-3 border-n-amber-4 text-n-amber-11',
+    teal: 'bg-n-teal-3 border-n-teal-4 text-n-teal-11',
+    ruby: 'bg-n-ruby-3 border-n-ruby-4 text-n-ruby-11',
+    blue: 'bg-n-blue-3 border-n-blue-4 text-n-blue-11',
+  };
+
+  return classMap[props.color];
+});
+
+const buttonClass = computed(() => {
+  const classMap = {
+    slate: 'bg-n-slate-4 text-n-slate-11',
+    amber: 'bg-n-amber-4 text-n-amber-11',
+    teal: 'bg-n-teal-4 text-n-teal-11',
+    ruby: 'bg-n-ruby-4 text-n-ruby-11',
+    blue: 'bg-n-blue-4 text-n-blue-11',
+  };
+
+  return classMap[props.color];
+});
+
+const triggerAction = () => {
+  emit('action');
+};
+</script>
+
+<template>
+  <div
+    class="text-sm rounded-xl flex items-center justify-between gap-2 border"
+    :class="[
+      bannerClass,
+      {
+        'py-2 px-3': !actionLabel,
+        'pl-3 p-2': actionLabel,
+      },
+    ]"
+  >
+    <div>
+      <slot />
+    </div>
+    <div>
+      <button
+        v-if="actionLabel"
+        class="px-3 py-1 w-auto grid place-content-center rounded-lg"
+        :class="buttonClass"
+        @click="triggerAction"
+      >
+        {{ actionLabel }}
+      </button>
+    </div>
+  </div>
+</template>