fix: resolve 4 bugs in termui

examples/weather/src/index.tsx

@@ -201,7 +201,7 @@ async function fetchWeather() {
   }
 }
 
-setInterval(fetchWeather, 5000);
+clearInterval(window.__interval); window.__interval = setInterval(fetchWeather, 5000);
 fetchWeather();
 
 // Gauge does not expose a public setColor() method, so dynamic color

packages/core/src/app/App.ts

@@ -543,7 +543,7 @@ export class App {
                 // dropped that state change. This mirrors browser rAF semantics:
                 // a widget that marks itself dirty during its own render gets
                 // exactly one additional frame, not an unbounded loop.
-                if (this._rootWidget.isDirty === true) {
+                if (this._rootWidget.isDirty ) {
                     this.requestRender();
                 }
             }

packages/ui/src/prompts.ts

@@ -113,7 +113,7 @@ async function promptSelect<T = string>(options: SelectPromptOptions<T>): Promis
                     return;
                 }
                 const n = parseInt(trimmed, 10);
-                if (!isNaN(n) && n >= 1 && n <= choices.length) {
+                if (!Number.isNaN(n) && n >= 1 && n <= choices.length) {
                     rl.close();
                     resolve(choices[n - 1].value);
                     return;