Square off the rail header and add a back button

The rail header now sits in the standard 64px row with a hairline under
it, matching the pane headers, and shows the full logo off the chat
pages instead of the bare stone. A back button joins the conversation
and settings headers (workspace pages only for the conversation). The
rail's own back link and the dividers around it are switched off for now.

Also renames the bot and workspace Delete group to Danger Zone, lifts the
step budget to 50, and lets Logo render without its home link.

src/pages/admin/settings/workspaces/[workspace_id]/(partials)/workspace-delete-group.tsx

@@ -19,12 +19,20 @@ export default function WorkspaceDeleteGroup({ workspace }: Props) {
     const name = workspace.name || "this workspace";
 
     const remove = async () => {
-        if (!window.confirm(`Delete ${name} and every conversation in it? Its bots and computers stay.`)) return;
+        if (
+            !window.confirm(
+                `Delete ${name} and every conversation in it? Its bots and computers stay.`,
+            )
+        )
+            return;
 
         setLoading(true);
         setError(undefined);
 
-        const res = await postAdminApi({ path: "workspaces/delete-workspace", body: { workspace_id: workspace.id } });
+        const res = await postAdminApi({
+            path: "workspaces/delete-workspace",
+            body: { workspace_id: workspace.id },
+        });
 
         if (res.success) {
             window.location.href = "/admin/settings/workspaces";
@@ -37,9 +45,9 @@ export default function WorkspaceDeleteGroup({ workspace }: Props) {
 
     return (
         <SettingsGroup
-            id="delete"
-            title="Delete"
-            description="Deletes the workspace and its conversations. Its bots and computers stay yours."
+            id="danger-zone"
+            title="Danger Zone"
+            description="Irreversible actions live here. Be careful."
         >
             <Button
                 title={`Delete ${name}`}
@@ -54,7 +62,9 @@ export default function WorkspaceDeleteGroup({ workspace }: Props) {
             >
                 Delete workspace
             </Button>
-            <SettingsStatus status={error ? { error: true, msg: error } : undefined} />
+            <SettingsStatus
+                status={error ? { error: true, msg: error } : undefined}
+            />
         </SettingsGroup>
     );
 }