add refund logic and fix books inventory logic

app/Views/inventory/book/index.php

@@ -5,13 +5,13 @@
   <div class="d-flex justify-content-between align-items-center mb-3 px-3">
     <h3 class="mb-0">Books</h3>
     <div class="btn-group">
+      <a class="btn btn-outline-primary" href="<?= site_url('inventory/book-prices') ?>">Book Prices</a>
       <a class="btn btn-primary" href="<?= site_url('inventory/create/book') ?>">Add Book</a>
       <button class="btn btn-outline-secondary" data-bs-toggle="modal" data-bs-target="#addCategoryModal">Add Category</button>
     </div>
   </div>
 
   <?= view('partials/flash_messages') ?>
-  <div class="px-3 mb-2"><?= $this->include('partials/academic_filter') ?></div>
 
   <?php
   // Helper to render a compact grade label from a category row
@@ -50,7 +50,7 @@
             <th>Grade Range</th> <!-- NEW -->
             <th>Qty</th><th>Unit</th>
             <th>Updated By</th><th>Updated Date</th>
-            <th>SKU</th><th style="width:110px">Actions</th>
+	            <th>SKU</th><th style="width:150px">Actions</th>
           </tr>
         </thead>
         <tbody>
@@ -72,7 +72,7 @@
             <td><?= esc($i['updated_at'] ? local_datetime($i['updated_at'], 'm-d-Y H:i') : '—') ?></td>
             <td><?= esc($i['sku']) ?></td>
             <td>
-              <a class="btn btn-sm btn-outline-primary" href="<?= site_url('inventory/edit/'.$i['id']) ?>">Edit</a>
+	              <a class="btn btn-sm btn-outline-primary" href="<?= site_url('inventory/edit/'.$i['id']) ?>">Edit Book</a>
               <form action="<?= site_url('inventory/delete/'.$i['id']) ?>" method="post" class="d-inline">
                 <?= csrf_field() ?>
                 <button class="btn btn-sm btn-outline-danger" onclick="return confirm('Delete this item?')">Del</button>