fix(inquirerer): fix cursor positioning for viewport rendering

On first render, cursor is at bottom after printing newlines, so move up viewportHeight.
On subsequent renders, cursor is on last viewport row (no trailing newline), so move up viewportHeight-1.
This prevents the 'filling screen upward' bug where each render landed one row higher.

Author: pyramation

packages/inquirerer/src/ui/viewport.ts

@@ -234,16 +234,20 @@ export class ViewportRenderer {
     }
 
     // On first render, reserve space by printing empty lines
-    // This establishes the viewport region
+    // This establishes the viewport region at the bottom of the terminal
     if (!this.hasRenderedOnce) {
+      // Print viewportHeight newlines to reserve space
       for (let i = 0; i < this.viewportHeight; i++) {
         this.write('\n');
       }
       this.hasRenderedOnce = true;
+      // After first render, cursor is at bottom. Move up viewportHeight to get to top.
+      this.write(ANSI.cursorUp(this.viewportHeight));
+    } else {
+      // On subsequent renders, cursor is on the last viewport row (since we don't emit trailing newline)
+      // Move up (viewportHeight - 1) to get back to the first viewport row
+      this.write(ANSI.cursorUp(this.viewportHeight - 1));
     }
-    
-    // Move cursor back to start of viewport
-    this.write(ANSI.cursorUp(this.viewportHeight));
     this.write(ANSI.cursorToStart);
 
     // Clear and redraw each line