feat: Agent assignment policy index page with CRUD actions (#12373)

# Pull Request Template

## Description

This PR incudes new Agent assignment policy index page with CRUD
actions.

Fixes
https://linear.app/chatwoot/issue/CW-5570/feat-assignment-policy-index-page-with-actions

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

### Loom

https://www.loom.com/share/17ab5ceca4854f179628a3b53f347e5a?sid=cb64e881-57fd-4ae1-921b-7648653cca33

### Screenshots

**Light mode**
<img width="1428" height="888" alt="image"
src="https://github.com/user-attachments/assets/fdbb83e9-1f4f-4432-9e8a-4a8f1b810d31"
/>


**Dark mode**
<img width="1428" height="888" alt="image"
src="https://github.com/user-attachments/assets/f1fb38b9-1150-482c-ba62-3fe63ee1c7d4"
/>
<img width="726" height="495" alt="image"
src="https://github.com/user-attachments/assets/90a6ad55-9ab6-4adb-93a7-2327f5f09c79"
/>


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/components-next/AssignmentPolicy/components/story/CardPopover.story.vue

@@ -0,0 +1,45 @@
+<script setup>
+import CardPopover from '../CardPopover.vue';
+
+const mockItems = [
+  {
+    id: 1,
+    name: 'Website Support',
+    icon: 'i-lucide-globe',
+  },
+  {
+    id: 2,
+    name: 'Email Support',
+    icon: 'i-lucide-mail',
+  },
+  {
+    id: 3,
+    name: 'WhatsApp Business',
+    icon: 'i-lucide-message-circle',
+  },
+  {
+    id: 4,
+    name: 'Facebook Messenger',
+    icon: 'i-lucide-facebook',
+  },
+];
+</script>
+
+<template>
+  <Story
+    title="Components/AgentManagementPolicy/CardPopover"
+    :layout="{ type: 'grid', width: '800px' }"
+  >
+    <Variant title="Basic Usage">
+      <div class="p-8 bg-n-background flex gap-4 h-96 items-start">
+        <CardPopover
+          :count="3"
+          title="Added Inboxes"
+          icon="i-lucide-inbox"
+          :items="mockItems.slice(0, 3)"
+          @fetch="() => console.log('Fetch triggered')"
+        />
+      </div>
+    </Variant>
+  </Story>
+</template>