Fix: Replace empty divs with proper Bootstrap modals for Respond to Call/Station

The commit RE1-T104 switched from Kendo UI Windows to Bootstrap modals
but didn't add the required modal HTML structure. Kendo's kendoWindow()
could auto-create the window on empty divs, but Bootstrap modals require
actual HTML with .modal, .modal-dialog, .modal-content classes.

This fix adds proper Bootstrap modal HTML for both respondToACallWindow
and respondToAStationWindow modals in Dashboard.cshtml.

Fixes #317

Author: waylonkenning

Web/Resgrid.Web/Areas/User/Views/Home/Dashboard.cshtml

@@ -222,8 +222,30 @@
   </div>
 </div>
 
-<div class="respondToACallWindow" id="respondToACallWindow"></div>
-<div class="respondToAStationWindow" id="respondToAStationWindow"></div>
+<div class="modal fade" tabindex="-1" role="dialog" id="respondToACallWindow">
+  <div class="modal-dialog">
+    <div class="modal-content">
+      <div class="modal-header">
+        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
+        <h4 class="modal-title">@localizer["RespondToCall"]</h4>
+      </div>
+      <div class="modal-body">
+      </div>
+    </div>
+  </div>
+</div>
+<div class="modal fade" tabindex="-1" role="dialog" id="respondToAStationWindow">
+  <div class="modal-dialog">
+    <div class="modal-content">
+      <div class="modal-header">
+        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
+        <h4 class="modal-title">@localizer["RespondToStation"]</h4>
+      </div>
+      <div class="modal-body">
+      </div>
+    </div>
+  </div>
+</div>
 
 @section Scripts
 {