ui: hx-swap none on Run-now + truthful save banner + tailwind rebuild

Add hx-swap="none" to the three Run-now buttons (check/prune/unlock) in
host_repo.html to match the existing pattern on host_sources.html and
host_schedules.html. Fix all-blank admin-credentials save to redirect
without ?saved= query string so no false-positive banner is shown;
strengthen the corresponding test to assert Location has no ?saved=.
Rebuild CSS bundle via Tailwind to pick up max-w-[640px] JIT class.

web/templates/pages/host_repo.html

@@ -195,6 +195,7 @@
       <div class="grid grid-cols-3 gap-3">
         <button type="button"
                 hx-post="/hosts/{{$host.ID}}/repo/check"
+                hx-swap="none"
                 hx-confirm="Run check now ({{$m.CheckSubsetPct}}% data subset)?"
                 class="btn btn-secondary"
                 {{if not $page.Online}}disabled title="agent is offline"{{end}}>
@@ -202,6 +203,7 @@
         </button>
         <button type="button"
                 hx-post="/hosts/{{$host.ID}}/repo/prune"
+                hx-swap="none"
                 hx-confirm="Run prune now? Removes data not referenced by any snapshot — heavy operation."
                 class="btn btn-secondary"
                 {{if not $page.HasAdminPassword}}disabled title="set admin credentials first"{{else if not $page.Online}}disabled title="agent is offline"{{end}}>
@@ -209,6 +211,7 @@
         </button>
         <button type="button"
                 hx-post="/hosts/{{$host.ID}}/repo/unlock"
+                hx-swap="none"
                 hx-confirm="Clear stale repo locks?"
                 class="btn btn-secondary"
                 {{if not $page.Online}}disabled title="agent is offline"{{end}}>