Webapp redesign phase 6: the remaining pages

Restyled to the same row pattern (one line, details in an expandable
body, one action plus a menu, tokens for light and dark):
- hardware coverage, audit log (family chips, destructive actions in
  red, client-side filters, first 300 rows), Clonezilla backups,
  enrollment packages (active package marked and undeletable, MCL flags
  with a visible legend)
- image Overview, OS and packages, Unattend (sticky save bar), Import
- Dell, iPXE, Blancco and BPRT update pages; Dell history links to the
  rollback review instead of rolling back on one click
- boot menu editor (tabs, rows with a menu, lint chips that jump to the
  line, tokens instead of hard-coded dark colours) and the imaging
  session detail page

Fixes found on the way:
- BPRT batch Activate never asked to confirm: a hidden input named
  'confirm' shadowed window.confirm in the inline handler, so the form
  submitted without a prompt. It now calls window.confirm.
- Backup upload refused when a backup with that name exists, unless
  'Replace the existing backup' is ticked (it overwrote silently).
- app.js: em dashes in comments replaced (plain ASCII).

webapp/static/app.js

@@ -203,7 +203,7 @@ document.addEventListener('DOMContentLoaded', function () {
   });
 
   // -----------------------------------------------------------------------
-  // AutoLogon Enabled toggle — keep hidden input in sync
+  // AutoLogon Enabled toggle - keep hidden input in sync
   // -----------------------------------------------------------------------
   var autologonToggle = document.getElementById('autologonEnabledToggle');
   if (autologonToggle) {
@@ -216,7 +216,7 @@ document.addEventListener('DOMContentLoaded', function () {
   }
 
   // -----------------------------------------------------------------------
-  // OOBE toggle switches — keep hidden input in sync
+  // OOBE toggle switches - keep hidden input in sync
   // -----------------------------------------------------------------------
   document.querySelectorAll('.oobe-toggle').forEach(function (cb) {
     cb.addEventListener('change', function () {