v1.53.1: the run-target search rendered into a 1px sliver

Reported by the owner minutes after v1.53.0: typing a name showed no
results. The results existed — .candlist is a scrollable box, and a
scrollable flex item inside the dialog body collapses happily: 26 matching
rows rendered inside a 1px strip. The binding dropdown never showed this
because it sits inside .droppanel, a block context.

flex: 0 0 auto + a min-height keeps it open. The smoke now MEASURES the
list and the first row instead of counting DOM nodes — counting is exactly
why it passed a build where nothing was visible.

src/styles.ts

@@ -1237,6 +1237,13 @@ export const cardStyles = css`
       max-height: 160px;
       overflow-y: auto;
       border-top: 1px solid var(--hp-line);
+      /* A scrollable box is a flex item that HAPPILY collapses: inside the
+         dialog body (a flex column) this list rendered its rows into a 1px
+         sliver — the DOM had 26 candidates and the user saw nothing. In the
+         binding dropdown it sits inside .droppanel (block context) and never
+         showed the bug. Field report, 2026-07-30. */
+      flex: 0 0 auto;
+      min-height: 2.6em;
     }
     .cand {
       display: flex;