fix(tui): balanced keyboard frames on emergency exit

- Popped the alternate-screen keyboard frame before restoring the main screen.
- Reset the main-screen keyboard state in live and blind emergency cleanup.
- Added regression coverage for both restore paths.

Fixes #6810

packages/tui/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed emergency exits from fullscreen overlays leaving omp's main-screen Kitty keyboard frame active, which could corrupt Arrow Up input in the terminal pane after omp exited ([#6810](https://github.com/can1357/oh-my-pi/issues/6810)).
+
 ## [17.1.4] - 2026-07-26
 
 ### Fixed

packages/tui/src/terminal.ts

@@ -275,17 +275,15 @@ export function emergencyTerminalRestore(): void {
 		restoreTerminalStderr();
 		const terminal = activeTerminal;
 		if (terminal) {
-			terminal.stop();
-			// stop() never touches the alternate screen — the TUI owns that
-			// state and exits it on the normal shutdown path. Only crash paths
-			// with a fullscreen overlay still hold the alt buffer here. The
-			// leave sequence is gated on the tracked state because it is NOT a
-			// universally safe no-op: Windows' VT dispatcher homes the cursor
-			// on DECRST 1049 even when the alt buffer is inactive.
+			// Keyboard enhancement state is screen-local: pop the alt-screen
+			// frame before leaving it, then let stop() pop omp's main-screen frame.
 			if (altScreenActive) {
-				terminal.write("\x1b[?1049l");
+				const keyboardExit =
+					terminal.keyboardEnhancementExitSequence ?? (terminal.kittyEnableSequence ? "\x1b[<u" : "");
+				terminal.write(`${keyboardExit}\x1b[?1049l`);
 				altScreenActive = false;
 			}
+			terminal.stop();
 			terminal.showCursor();
 		} else if (terminalEverStarted && !isTerminalHeadless()) {
 			// Blind restore only if we know a terminal was started but lost track of it
@@ -305,7 +303,7 @@ export function emergencyTerminalRestore(): void {
 					// actually holds it — on Windows, DECRST 1049 on the main
 					// buffer homes the cursor (unconditional CursorRestoreState
 					// with no prior save), corrupting the shell handoff on exit.
-					(altScreenActive ? "\x1b[?1049l" : "") +
+					(altScreenActive ? "\x1b[?1049l\x1b[?1l\x1b>\x1b[<u" : "") + // Leave alt; reset main keyboard
 					"\x1b[?25h", // Show cursor
 			);
 			altScreenActive = false;

packages/tui/test/emergency-restore-altscreen.test.ts

@@ -92,6 +92,8 @@ describe("emergencyTerminalRestore alt-screen gating", () => {
 		emergencyTerminalRestore();
 		const firstRestore = writes.join("");
 		expect(firstRestore).toContain("\x1b[?1049l");
+		const altExit = firstRestore.indexOf("\x1b[?1049l");
+		expect(firstRestore.indexOf("\x1b[<u", altExit + 1)).toBeGreaterThan(altExit);
 		expect(firstRestore).toContain("\x1b[?1006l");
 		expect(firstRestore).toContain("\x1b[?1003l");
 		expect(firstRestore).toContain("\x1b[?1000l");
@@ -122,4 +124,23 @@ describe("emergencyTerminalRestore alt-screen gating", () => {
 		expect(activeRestore).toContain("\x1b[?1003l");
 		expect(activeRestore).toContain("\x1b[?1000l");
 	});
+	it("pops keyboard enhancement frames on both screens when crashing from a fullscreen overlay", () => {
+		const { terminal, writes } = startCapturedTerminal();
+		process.stdin.emit("data", "\x1b[?0u");
+		expect(terminal.kittyEnableSequence).toBe("\x1b[>1u");
+
+		terminal.write(`\x1b[?1049h${terminal.kittyEnableSequence}`);
+		setAltScreenActive(true);
+		writes.length = 0;
+
+		emergencyTerminalRestore();
+
+		const restored = writes.join("");
+		const altPop = restored.indexOf("\x1b[<u");
+		const altExit = restored.indexOf("\x1b[?1049l");
+		const mainPop = restored.indexOf("\x1b[<u", altExit + 1);
+		expect(altPop).toBeGreaterThanOrEqual(0);
+		expect(altPop).toBeLessThan(altExit);
+		expect(mainPop).toBeGreaterThan(altExit);
+	});
 });