tui: remove unused dialog-theme component

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

@@ -1,44 +0,0 @@
-import { useTheme } from "../context/theme"
-import { DialogSelect } from "../ui/dialog-select"
-import { useDialog } from "../ui/dialog"
-
-export function DialogTheme() {
-  const { mode, setMode } = useTheme()
-  const dialog = useDialog()
-
-  const options = () => [
-    {
-      key: "dark",
-      value: "dark",
-      title: "Dark",
-      description: "Use dark theme",
-      category: "Theme",
-    },
-    {
-      key: "light",
-      value: "light",
-      title: "Light",
-      description: "Use light theme",
-      category: "Theme",
-    },
-    {
-      key: "auto",
-      value: "auto",
-      title: "Auto",
-      description: "Automatically switch based on system preference",
-      category: "Theme",
-    },
-  ]
-
-  return (
-    <DialogSelect
-      title="Select Theme"
-      current={mode()}
-      options={options()}
-      onSelect={(option) => {
-        setMode(option.value as "dark" | "light" | "auto")
-        dialog.clear()
-      }}
-    />
-  )
-}