Standardize UI consistency across ShopDB pages

Security fixes:
- Add HTMLEncode to displaysubnets.asp output
- Add HTMLEncode to displayapplications.asp URL attributes

Icon standardization:
- Use zmdi-plus-circle for all Add buttons (displaypcs, pcs, pclist, computers, listpcs)
- Use zmdi-edit for all Edit tab icons (displayapplication, displayprinter, displaysubnet, displaydevice)
- Replace icon-note with zmdi icons throughout

Layout consistency:
- Standardize title row margin-bottom to 15px across all pages
- Add table-hover class to all data tables
- Fix editpc.asp title from "Edit Equipment" to "Edit PC"
- Fix editpc.asp back link to point to displaypcs.asp

Terminology:
- Change "Make" to "Vendor" in displayprinters.asp
- Standardize Back button text to "Back to [Page]" format

Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

displayapplication.asp

@@ -80,7 +80,7 @@
                     <a href="javascript:void();" data-target="#profile" data-toggle="pill" class="nav-link active"><i class="icon-wrench"></i> <span class="hidden-xs">Settings</span></a>
                 </li>
                 <li class="nav-item">
-                    <a href="javascript:void();" data-target="#edit" data-toggle="pill" class="nav-link"><i class="icon-note"></i> <span class="hidden-xs">Edit</span></a>
+                    <a href="javascript:void();" data-target="#edit" data-toggle="pill" class="nav-link"><i class="zmdi zmdi-edit"></i> <span class="hidden-xs">Edit</span></a>
                 </li>
             </ul>
             <div class="tab-content p-3">