Add PI_NO_HARDWARE_CURSOR env var for terminals with limited escape sequence support

Fixes cursor visibility issues in JetBrains IDE terminals (IntelliJ, PyCharm) where
the hardware cursor either blinks or becomes invisible depending on settings.

Fixes #771

packages/tui/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- `PI_NO_HARDWARE_CURSOR=1` environment variable to disable hardware cursor positioning for terminals with limited escape sequence support (e.g., IntelliJ IDEA's built-in terminal)
+
 ## [0.47.0] - 2026-01-16
 
 ### Breaking Changes

packages/tui/src/tui.ts

@@ -981,6 +981,12 @@ export class TUI extends Container {
 	 * @param totalLines Total number of rendered lines
 	 */
 	private positionHardwareCursor(cursorPos: { row: number; col: number } | null, totalLines: number): void {
+		// PI_NO_HARDWARE_CURSOR=1 disables hardware cursor for terminals that don't handle it well
+		if (process.env.PI_NO_HARDWARE_CURSOR === "1") {
+			this.terminal.hideCursor();
+			return;
+		}
+
 		if (!cursorPos || totalLines <= 0) {
 			this.terminal.hideCursor();
 			return;