Use OpenTUI theme detection for initial TUI mode, again (#23846)

packages/opencode/src/cli/cmd/tui/app.tsx

@@ -1,7 +1,6 @@
 import { render, TimeToFirstDraw, useKeyboard, useRenderer, useTerminalDimensions } from "@opentui/solid"
 import * as Clipboard from "@tui/util/clipboard"
 import * as Selection from "@tui/util/selection"
-import * as Terminal from "@tui/util/terminal"
 import { createCliRenderer, MouseButton, type CliRendererConfig } from "@opentui/core"
 import { RouteProvider, useRoute } from "@tui/context/route"
 import {
@@ -121,12 +120,6 @@ export function tui(input: {
     const unguard = win32InstallCtrlCGuard()
     win32DisableProcessedInput()
 
-    const mode = await Terminal.getTerminalBackgroundColor()
-
-    // Re-clear after getTerminalBackgroundColor() because setRawMode(false)
-    // restores the original console mode, including processed input on Windows.
-    win32DisableProcessedInput()
-
     const onExit = async () => {
       unguard?.()
       resolve()
@@ -137,6 +130,7 @@ export function tui(input: {
     }
 
     const renderer = await createCliRenderer(rendererConfig(input.config))
+    const mode = (await renderer.waitForThemeMode(1000)) ?? "dark"
 
     await render(() => {
       return (