Unify edit-role dialog with AdminFormDialog (#621)

The "edit role" dialog in admin.tsx was hand-rolled as a bespoke
<div role-less wrapper> with its own close button, sticky footer and
full-width split buttons. That made it look different from every
other admin dialog (add role, add/edit group, add user), and on
iPad the action buttons floated mid-dialog because the content
exceeded max-h-[92vh]. The custom wrapper also lacked role="dialog",
so the new `:has(:focus)` CSS keyboard rule (index.css:492) never
applied to it.

Replaced the wrapper with AdminFormDialog (maxWidth="lg", KeyRound
icon, same title key). All inner content — name/desc fields, rename
warning, permissions list, removal impact, RolePermissionHistory,
RecentActivityForTarget — moved verbatim as children. Removed the
custom sticky footer; AdminFormDialog provides the unified footer
with cancel/save buttons. Preserved testIds `edit-role-dialog` and
`edit-role-submit`. Disabled logic translated 1:1 into
submitDisabled + isPending props (note: `impactError` coerced to
boolean via `!!` to satisfy the prop type).

No behavior change: same handlers (closeEditDialog, handleEdit),
same loading spinner, same disabled conditions. Bonus: the keyboard
override CSS now applies because AdminFormDialog already sets
role="dialog".

`tsc --noEmit` clean.

artifacts/tx-os/src/pages/admin.tsx

@@ -6867,20 +6867,21 @@ function RolesPanel({
       )}
 
       {editingId != null && (
-        <div className="fixed inset-0 bg-slate-900/50 backdrop-blur-sm z-50 flex items-center justify-center p-4">
-          <div
-            className="relative bg-white rounded-2xl sm:rounded-3xl shadow-2xl ring-1 ring-slate-200 p-5 sm:p-6 w-full max-w-[min(100%,560px)] sm:max-w-xl md:max-w-2xl space-y-4 max-h-[92vh] overflow-y-auto"
-            data-testid="edit-role-dialog"
-          >
-            <button
-              type="button"
-              onClick={closeEditDialog}
-              aria-label={t("common.cancel")}
-              className="absolute top-3 end-3 inline-flex items-center justify-center w-9 h-9 rounded-full text-slate-500 hover:text-slate-900 hover:bg-slate-100"
-            >
-              <X size={18} />
-            </button>
-            <h2 className="text-lg sm:text-xl font-semibold text-foreground pe-10">{t("admin.roles.editRole")}</h2>
+        <AdminFormDialog
+          title={t("admin.roles.editRole")}
+          icon={<KeyRound size={20} />}
+          maxWidth="lg"
+          onCancel={closeEditDialog}
+          onSubmit={handleEdit}
+          submitDisabled={
+            !editForm.name.trim() ||
+            (!editingIsSystem && hasRemovals && (impactLoading || !!impactError))
+          }
+          isPending={updateRole.isPending || replaceRolePermissions.isPending}
+          testId="edit-role-dialog"
+          submitTestId="edit-role-submit"
+        >
+          <>
             <div className="space-y-1">
               <Label>{t("admin.roles.name")}</Label>
               <Input
@@ -7079,30 +7080,8 @@ function RolesPanel({
                 onOpenAuditLogForTarget("role", editingPermissionsId);
               }}
             />
-            <div className="flex gap-2 pt-3 sticky bottom-0 bg-white -mx-5 sm:-mx-6 px-5 sm:px-6 -mb-5 sm:-mb-6 pb-5 sm:pb-6 border-t border-slate-100">
-              <Button variant="outline" className="flex-1 min-h-11 rounded-xl text-base" onClick={closeEditDialog}>
-                {t("common.cancel")}
-              </Button>
-              <Button
-                className="flex-1 min-h-11 rounded-xl text-base"
-                disabled={
-                  !editForm.name.trim() ||
-                  updateRole.isPending ||
-                  replaceRolePermissions.isPending ||
-                  (!editingIsSystem && hasRemovals && (impactLoading || impactError))
-                }
-                onClick={handleEdit}
-                data-testid="edit-role-submit"
-              >
-                {updateRole.isPending || replaceRolePermissions.isPending ? (
-                  <Loader2 size={14} className="animate-spin" />
-                ) : (
-                  t("common.save")
-                )}
-              </Button>
-            </div>
-          </div>
-        </div>
+          </>
+        </AdminFormDialog>
       )}
 
       {confirmRemoval && permissionsImpact && permissionsImpact.totalAffectedUsers > 0 && (