tui: fix Windows terminal suspend and input undo keybindings

On Windows, native terminals don't support POSIX suspend (ctrl+z), so we now
assign ctrl+z to input undo instead of terminal suspend. Terminal suspend is
disabled on Windows to avoid conflicts with the undo functionality.

packages/opencode/src/cli/cmd/tui/config/tui-migrate.ts

@@ -26,7 +26,6 @@ const TuiLegacy = z
 interface MigrateInput {
   cwd: string
   directories: string[]
-  custom?: string
 }
 
 /**

packages/opencode/src/cli/cmd/tui/config/tui.ts

@@ -17,6 +17,7 @@ import { InstallationLocal, InstallationVersion } from "@/installation/version"
 import { makeRuntime } from "@/cli/effect/runtime"
 import { Filesystem, Log } from "@/util"
 
+export namespace TuiConfig {
   const log = Log.create({ service: "tui.config" })
 
   export const Info = TuiInfo
@@ -48,10 +49,6 @@ function pluginScope(file: string, ctx: { directory: string }): ConfigPlugin.Sco
     return "global"
   }
 
-function customPath() {
-  return Flag.OPENCODE_TUI_CONFIG
-}
-
   function normalize(raw: Record<string, unknown>) {
     const data = { ...raw }
     if (!("tui" in data)) return data
@@ -91,30 +88,40 @@ async function mergeFile(acc: Acc, file: string, ctx: { directory: string }) {
   }
 
   async function loadState(ctx: { directory: string }) {
-  let projectFiles = Flag.OPENCODE_DISABLE_PROJECT_CONFIG ? [] : await ConfigPaths.projectFiles("tui", ctx.directory)
+    // Every config dir we may read from: global config dir, any `.opencode`
+    // folders between cwd and home, and OPENCODE_CONFIG_DIR.
     const directories = await ConfigPaths.directories(ctx.directory)
-  const custom = customPath()
-  await migrateTuiConfig({ directories, custom, cwd: ctx.directory })
-  // Re-compute after migration since migrateTuiConfig may have created new tui.json files
-  projectFiles = Flag.OPENCODE_DISABLE_PROJECT_CONFIG ? [] : await ConfigPaths.projectFiles("tui", ctx.directory)
+    // One-time migration: extract tui keys (theme/keybinds/tui) from existing
+    // opencode.json files into sibling tui.json files.
+    await migrateTuiConfig({ directories, cwd: ctx.directory })
+
+    const projectFiles = Flag.OPENCODE_DISABLE_PROJECT_CONFIG
+      ? []
+      : await ConfigPaths.projectFiles("tui", ctx.directory)
 
     const acc: Acc = {
       result: {},
     }
 
+    // 1. Global tui config (lowest precedence).
     for (const file of ConfigPaths.fileInDirectory(Global.Path.config, "tui")) {
       await mergeFile(acc, file, ctx)
     }
 
-  if (custom) {
-    await mergeFile(acc, custom, ctx)
-    log.debug("loaded custom tui config", { path: custom })
+    // 2. Explicit OPENCODE_TUI_CONFIG override, if set.
+    if (Flag.OPENCODE_TUI_CONFIG) {
+      await mergeFile(acc, Flag.OPENCODE_TUI_CONFIG, ctx)
+      log.debug("loaded custom tui config", { path: Flag.OPENCODE_TUI_CONFIG })
     }
 
+    // 3. Project tui files, applied root-first so the closest file wins.
     for (const file of projectFiles) {
       await mergeFile(acc, file, ctx)
     }
 
+    // 4. `.opencode` directories (and OPENCODE_CONFIG_DIR) discovered while
+    // walking up the tree. Also returned below so callers can install plugin
+    // dependencies from each location.
     const dirs = unique(directories).filter((dir) => dir.endsWith(".opencode") || dir === Flag.OPENCODE_CONFIG_DIR)
 
     for (const dir of dirs) {
@@ -209,5 +216,4 @@ async function load(text: string, configFilepath: string): Promise<Info> {
         return {}
       })
   }
-
-export * as TuiConfig from "./tui"
+}

packages/opencode/src/config/config.ts

@@ -19,7 +19,6 @@ import { GlobalBus } from "@/bus/global"
 import { Event } from "../server/event"
 import { Account } from "@/account"
 import { isRecord } from "@/util/record"
-import { InvalidError, JsonError } from "./error"
 import type { ConsoleState } from "./console-state"
 import { AppFileSystem } from "@opencode-ai/shared/filesystem"
 import { InstanceState } from "@/effect"

packages/opencode/src/config/keybinds.ts

@@ -106,7 +106,12 @@ export const Keybinds = z
     input_delete_to_line_start: z.string().optional().default("ctrl+u").describe("Delete to start of line in input"),
     input_backspace: z.string().optional().default("backspace,shift+backspace").describe("Backspace in input"),
     input_delete: z.string().optional().default("ctrl+d,delete,shift+delete").describe("Delete character in input"),
-    input_undo: z.string().optional().default("ctrl+-,super+z").describe("Undo in input"),
+    input_undo: z
+      .string()
+      .optional()
+      // On Windows prepend ctrl+z since terminal_suspend releases the binding.
+      .default(process.platform === "win32" ? "ctrl+z,ctrl+-,super+z" : "ctrl+-,super+z")
+      .describe("Undo in input"),
     input_redo: z.string().optional().default("ctrl+.,super+shift+z").describe("Redo in input"),
     input_word_forward: z
       .string()
@@ -144,7 +149,12 @@ export const Keybinds = z
     session_child_cycle: z.string().optional().default("right").describe("Go to next child session"),
     session_child_cycle_reverse: z.string().optional().default("left").describe("Go to previous child session"),
     session_parent: z.string().optional().default("up").describe("Go to parent session"),
-    terminal_suspend: z.string().optional().default("ctrl+z").describe("Suspend terminal"),
+    terminal_suspend: z
+      .string()
+      .optional()
+      .default("ctrl+z")
+      .transform((v) => (process.platform === "win32" ? "none" : v))
+      .describe("Suspend terminal"),
     terminal_title_toggle: z.string().optional().default("none").describe("Toggle terminal title"),
     tips_toggle: z.string().optional().default("<leader>h").describe("Toggle tips on home screen"),
     plugin_manager: z.string().optional().default("none").describe("Open plugin manager dialog"),