fix: redirect focus to hidden input after blurring Ghostty elements (#1122)

On Android tablets in Desktop site mode, the handleDocumentFocusIn handler
intercepted Ghostty's internal element focus and blurred them, but never
redirected focus to the hidden input overlay. This left the terminal with
no focused element - the IME keyboard would appear but keystrokes went
nowhere. Now focusHiddenInput() is called after the blur to ensure the
terminal always has a focused input surface.

packages/ui/src/components/terminal/TerminalViewport.tsx

@@ -1000,6 +1000,7 @@ const TerminalViewport = React.forwardRef<TerminalController, TerminalViewportPr
           if (useHiddenInputOverlay && target instanceof HTMLElement) {
             window.setTimeout(() => {
               target.blur();
+              focusHiddenInput();
             }, 0);
             setTerminalCursorBlink(false);
             return;