feat: Agent capacity policy Create/Edit pages (#12424)

# Pull Request Template

## Description

Fixes
https://linear.app/chatwoot/issue/CW-5573/feat-createedit-agent-capacity-policy-page

## Type of change

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

## How Has This Been Tested?

### Loom video

https://www.loom.com/share/8de9e3c5d8824cd998d242636540dd18?sid=1314536f-c8d6-41fd-8139-cae9bf94f942

### Screenshots

**Light mode**
<img width="1666" height="1225" alt="image"
src="https://github.com/user-attachments/assets/7e6d83a4-ce02-47a7-91f6-87745f8f5549"
/>
<img width="1666" height="1225" alt="image"
src="https://github.com/user-attachments/assets/7dd1f840-2e25-4365-aa1d-ed9dac13385a"
/>

**Dark mode**
<img width="1666" height="1225" alt="image"
src="https://github.com/user-attachments/assets/0c787095-7146-4fb3-a61a-e2232973bcba"
/>
<img width="1666" height="1225" alt="image"
src="https://github.com/user-attachments/assets/481c21fd-03b5-4c1f-b59e-7f8c8017f9ce"
/>


## 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
- [x] 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/DataTable.vue

@@ -1,4 +1,5 @@
 <script setup>
+import Avatar from 'next/avatar/Avatar.vue';
 import Icon from 'dashboard/components-next/icon/Icon.vue';
 import Button from 'dashboard/components-next/button/Button.vue';
 import Spinner from 'dashboard/components-next/spinner/Spinner.vue';
@@ -32,12 +33,14 @@ const handleDelete = itemId => {
   >
     <Spinner />
   </div>
-  <span
+  <div
     v-else-if="items.length === 0 && emptyStateMessage"
-    class="flex items-center justify-center pt-4 pb-8 w-full text-sm text-n-slate-11"
+    class="custom-dashed-border flex items-center justify-center py-6 w-full"
   >
-    {{ emptyStateMessage }}
-  </span>
+    <span class="text-sm text-n-slate-11">
+      {{ emptyStateMessage }}
+    </span>
+  </div>
   <div v-else class="flex flex-col divide-y divide-n-weak">
     <div
       v-for="item in items"
@@ -50,7 +53,14 @@ const handleDelete = itemId => {
           :icon="item.icon"
           class="size-4 text-n-slate-12 flex-shrink-0"
         />
-
+        <Avatar
+          v-else
+          :title="item.name"
+          :src="item.avatarUrl"
+          :name="item.name"
+          :size="20"
+          rounded-full
+        />
         <span class="text-sm text-n-slate-12 truncate min-w-0">
           {{ item.name }}
         </span>