fix: restore subagent footer and fix style guide violations (#19491)

packages/opencode/src/cli/cmd/tui/component/dialog-model.tsx

@@ -138,9 +138,9 @@ export function DialogModel(props: { providerID?: string }) {
     local.model.set({ providerID, modelID }, { recent: true })
     if (local.model.variant.list().length > 0) {
       dialog.replace(() => <DialogVariant />)
-    } else {
-      dialog.clear()
+      return
     }
+    dialog.clear()
   }
 
   return (

packages/opencode/src/cli/cmd/tui/component/dialog-variant.tsx

@@ -1,6 +1,5 @@
 import { createMemo } from "solid-js"
 import { useLocal } from "@tui/context/local"
-import { useSync } from "@tui/context/sync"
 import { DialogSelect } from "@tui/ui/dialog-select"
 import { useDialog } from "@tui/ui/dialog"