refactor(tui): share the decision-gate stop path

Author: bwachman

src/tui/shell/keys.ts

@@ -27,6 +27,7 @@ import {
   exitOverlayAnswerMode,
   handleOverlayAnswerKey,
   notifyOverlayClosed,
+  stopDecisionGate,
 } from "./overlay-host.js";
 import {
   applyFocus,
@@ -356,9 +357,7 @@ export function createShellKeyHandlers(
       // way Esc does, then interrupts the turn, which drops queued gates too.
       if (key.ctrl && key.name === "c" && isDecisionGate(shell)) {
         key.preventDefault();
-        abortOverlayHostReservations(shell);
-        closeInsetOverlay(shell);
-        interruptShell(shell);
+        stopDecisionGate(shell);
         return;
       }
       // Checked ahead of the filter handlers: an opener chord pressed again is

src/tui/shell/overlay-host.ts

@@ -51,6 +51,7 @@ import {
   relayout,
   setStatusFlash,
 } from "./chrome.js";
+import { interruptShell } from "./prompt.js";
 
 function refreshOverlayTitle(shell: AppShell): void {
   const bag = shellInternals(shell);
@@ -682,6 +683,13 @@ export function abortOverlayHostReservations(shell: AppShell): void {
   scheduleDeferredCommandFlush(shell);
 }
 
+/** Reject a decision gate and stop the turn, matching its Ctrl+C behavior. */
+export function stopDecisionGate(shell: AppShell): void {
+  abortOverlayHostReservations(shell);
+  closeInsetOverlay(shell);
+  interruptShell(shell);
+}
+
 /** One deferred command-surface slot while the host is busy. */
 function deferBusyCommandOpen(
   shell: AppShell,