Fix IPs page race between auto-refresh polling and action buttons

The 5s auto-poll (hx-trigger="every Ns" on #ips-table-wrap) and every
button/form that also swaps #ips-table-wrap (bulk recheck/delete/clear,
per-row recheck/cancel/delete, the add-address form) each fired
independent, uncoordinated htmx requests against the same target. With no
hx-sync, whichever response landed last won — including a poll's
in-flight GET landing *after* a slower mutation's own response and
silently reverting the just-applied change with stale data. This matched
every symptom reported: buttons needing several clicks before they
"took", "Перепроверить выбранные" appearing to do nothing with many rows
selected (more DB writes -> wider race window for a poll to land after
and clobber it), the page "blinking" back to a stale queued state a few
seconds after a bulk recheck actually succeeded, and auto-refresh working
"every other time".

Every element that targets #ips-table-wrap now shares
hx-sync="#ips-table-wrap:queue last", so at most one request affecting it
is ever in flight: a trigger that fires while another is pending gets
queued (never aborted mid-write) and only the most recent queued trigger
actually runs once the current one finishes, guaranteeing responses are
always applied in the order they actually resolve.

Rebuilt bin/admin-dashboard (only internal/dashboard changed) and
bin/SHA256SUMS per docs/SETUP.md's documented build recipe.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/dashboard/templates/ips.html

@@ -24,7 +24,7 @@
 
 <div class="panel">
 <div class="panel-body">
-<form hx-post="/ips" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-on::after-request="this.reset()">
+<form hx-post="/ips" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-sync="#ips-table-wrap:queue last" hx-on::after-request="this.reset()">
 <div class="field-row">
 <div class="field" style="flex: 1 1 420px;">
 <label for="addresses">Адреса (по одному на строку или через запятую)</label>
@@ -38,7 +38,7 @@
 </div>
 </div>
 
-<div id="ips-table-wrap" hx-get="/ips/fragment" hx-trigger="every {{.PollSeconds}}s" hx-swap="innerHTML">
+<div id="ips-table-wrap" hx-get="/ips/fragment" hx-trigger="every {{.PollSeconds}}s" hx-swap="innerHTML" hx-sync="#ips-table-wrap:queue last">
 {{template "ips_table" .}}
 </div>
 {{end}}
@@ -47,9 +47,9 @@
 <form id="ips-form">
 <div class="panel">
 <div class="panel-body" style="display:flex; gap:8px; align-items:center;">
-<button type="button" class="btn btn-ghost btn-sm" hx-post="/ips/recheck" hx-target="#ips-table-wrap" hx-swap="innerHTML">Перепроверить выбранные</button>
-<button type="button" class="btn btn-danger-ghost btn-sm" hx-post="/ips/delete" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-confirm="Удалить выбранные адреса без возможности восстановления?">Удалить выбранные</button>
-<button type="button" class="btn btn-danger-ghost btn-sm" hx-post="/ips/clear" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-confirm="Удалить ВСЕ адреса из очереди, включая те, что сейчас проверяются? Действие необратимо.">Очистить всё</button>
+<button type="button" class="btn btn-ghost btn-sm" hx-post="/ips/recheck" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-sync="#ips-table-wrap:queue last">Перепроверить выбранные</button>
+<button type="button" class="btn btn-danger-ghost btn-sm" hx-post="/ips/delete" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-sync="#ips-table-wrap:queue last" hx-confirm="Удалить выбранные адреса без возможности восстановления?">Удалить выбранные</button>
+<button type="button" class="btn btn-danger-ghost btn-sm" hx-post="/ips/clear" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-sync="#ips-table-wrap:queue last" hx-confirm="Удалить ВСЕ адреса из очереди, включая те, что сейчас проверяются? Действие необратимо.">Очистить всё</button>
 </div>
 <div class="table-scroll">
 <table>
@@ -68,11 +68,11 @@
 <td data-label="">
 <div class="actions">
 {{if $terminal}}
-<button class="btn btn-ghost btn-sm" hx-post="/ips/{{.IPAddress}}/recheck" hx-target="#ips-table-wrap" hx-swap="innerHTML">Перепроверить</button>
+<button class="btn btn-ghost btn-sm" hx-post="/ips/{{.IPAddress}}/recheck" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-sync="#ips-table-wrap:queue last">Перепроверить</button>
 {{else}}
-<button class="btn btn-danger-ghost btn-sm" hx-post="/ips/{{.IPAddress}}/cancel" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-confirm="Остановить проверку {{.IPAddress}}?">Отменить</button>
+<button class="btn btn-danger-ghost btn-sm" hx-post="/ips/{{.IPAddress}}/cancel" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-sync="#ips-table-wrap:queue last" hx-confirm="Остановить проверку {{.IPAddress}}?">Отменить</button>
 {{end}}
-<button class="btn btn-danger-ghost btn-sm" hx-delete="/ips/{{.IPAddress}}" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-confirm="Удалить {{.IPAddress}} без возможности восстановления?">Удалить</button>
+<button class="btn btn-danger-ghost btn-sm" hx-delete="/ips/{{.IPAddress}}" hx-target="#ips-table-wrap" hx-swap="innerHTML" hx-sync="#ips-table-wrap:queue last" hx-confirm="Удалить {{.IPAddress}} без возможности восстановления?">Удалить</button>
 </div>
 </td>
 </tr>