Give YES and NO the same width (#69)

Follow-up to #67: each button was only as wide as its label.

Closes #69 [no-card]

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/ui/styles.css

@@ -364,6 +364,10 @@ dialog h2 {
   flex-wrap: nowrap;
   align-items: flex-end;
 }
+/* YES and NO share one width, as the two rows of the original's box do. */
+.native-dialogue > .dialogue-choice[data-kind="yesno"] {
+  align-items: stretch;
+}
 /* Every entry shows (the bedroom PC has six). The dialogue box grows upward
    and scrolls only when the screen is too small. */
 .dialogue-menu {