Measure the time picker's dial after its dialog has finished opening

The test that holds the dial to its pixel size at a 20px root font size
read the dial's width straight after the click, so on a loaded machine it
caught the dialog mid-entry: scale 0.95 of 256px rounds to 243, a number
the stylesheet never sets. The assertion then compared the settled dial
against that, and failed for the whole retry window.

It now waits for the dialog's own animations to finish before taking the
resting width, the way the sheet tests already wait.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/Browser/TimepickerTest.php

@@ -408,6 +408,10 @@ it('keeps the dial and the boxes their fixed pixel size at a 20px root font size
 
     $page = timeProbe()->click('#meeting');
 
+    // After the dialog's entry, not during it: mid-scale the dial measures 0.95 of its own size,
+    // which would make the resting width this test compares against a number the CSS never sets.
+    $page->assertScript("document.querySelector('#meeting-dialog').getAnimations({ subtree: true }).length === 0");
+
     $restingWidth = (int) $page->script($dialWidth);
     $restingFont = $page->script($font);