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.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "houseplan-card",
-  "version": "1.53.0",
+  "version": "1.53.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "houseplan-card",
-      "version": "1.53.0",
+      "version": "1.53.1",
       "license": "MIT",
       "dependencies": {
         "lit": "^3.1.3",