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.

internal/server/http/ui_repo.go

@@ -490,7 +490,7 @@ func (s *Server) handleUIAdminCredentialsSave(w stdhttp.ResponseWriter, r *stdht
 	// We treat this as harmless — they may have wanted to clear via the
 	// Clear button instead. Only validate if they've started filling fields.
 	if repoURL == "" && repoUser == "" && repoPass == "" {
-		stdhttp.Redirect(w, r, "/hosts/"+host.ID+"/repo?saved=admin_credentials", stdhttp.StatusSeeOther)
+		stdhttp.Redirect(w, r, "/hosts/"+host.ID+"/repo", stdhttp.StatusSeeOther)
 		return
 	}