fix: revert parts of a824064c4 which caused system theme regression (#23714)

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

@@ -1,6 +1,7 @@
 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 {
@@ -119,6 +120,12 @@ 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()
@@ -129,7 +136,6 @@ export function tui(input: {
     }
 
     const renderer = await createCliRenderer(rendererConfig(input.config))
-    const mode = (await renderer.waitForThemeMode(1000)) ?? "dark"
 
     await render(() => {
       return (