ui: restore ⟳/✕ actions in edit mode only; shrink toggles; uniform 22px rows

The camera table actions column is back as the 9th column but stays empty in
the normal view — restart (⟳) and delete (✕) buttons render only on existing
cameras while bulk-editing. Restart in bulk mode no longer reloads the table
(keeps pending edits); delete reloads as before.

Row height is now truly uniform: cams-fixed cells use line-height:1 with
vertically-centred controls, the Вкл/Запись toggles shrink to 30×16, and
selects/inputs/action buttons cap at 20px so filled rows match empty slots.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/settings.html

@@ -47,7 +47,7 @@
           </div>
           <table class="cams cams-fixed">
             <thead>
-              <tr><th style="width:48px">ID</th><th>Камера</th><th>IP</th><th>Потоки</th><th style="width:56px">Вкл</th><th style="width:64px">Запись</th><th style="width:150px">Хранилище</th><th data-bulk-label="Логин / пароль">Статус</th></tr>
+              <tr><th style="width:48px">ID</th><th>Камера</th><th>IP</th><th>Потоки</th><th style="width:56px">Вкл</th><th style="width:64px">Запись</th><th style="width:150px">Хранилище</th><th data-bulk-label="Логин / пароль">Статус</th><th style="width:62px"></th></tr>
             </thead>
             <tbody id="cam-rows"></tbody>
           </table>