Fix TUI rendering with wrong dimensions after suspend/resume

- Send SIGWINCH to self on terminal start to refresh stale dimensions (Unix only)
- Change requestRender(true) to set previousWidth = -1 to trigger widthChanged
- Update first render condition to skip when widthChanged is true

Fixes #599

packages/tui/src/terminal.ts

@@ -70,6 +70,12 @@ export class ProcessTerminal implements Terminal {
 		// Set up resize handler immediately
 		process.stdout.on("resize", this.resizeHandler);
 
+		// Refresh terminal dimensions - they may be stale after suspend/resume
+		// (SIGWINCH is lost while process is stopped). Unix only.
+		if (process.platform !== "win32") {
+			process.kill(process.pid, "SIGWINCH");
+		}
+
 		// Query and enable Kitty keyboard protocol
 		// The query handler intercepts input temporarily, then installs the user's handler
 		// See: https://sw.kovidgoyal.net/kitty/keyboard-protocol/