fix(combobox): pin clear+trigger to first row, not vertical center

With many chips wrapping into 3+ rows, the previous `top: 50%` +
translateY centered the clear/trigger pair at the midpoint of the
whole stack — visually below the first row of chips. Pin to
`top: var(--space-1)` instead so they sit flush with the first chip
row no matter how many additional rows of chips wrap below.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/uix/eidos/components/combobox/combobox.css

@@ -526,8 +526,12 @@
 [data-combobox-control]:has([data-combobox-selected-tags]:not([data-empty]))
 	[data-combobox-trigger] {
 	position: absolute;
-	inset-block-start: 50%;
+	/* Pin to the FIRST row of the wrapped control so the affordances stay
-	transform: translateY(-50%);
+	 * aligned with the input + chip row even when many chips wrap into
+	 * extra rows below. `padding-block` (var(--space-1)) is the control's
+	 * top offset; matching that here keeps the buttons flush with the
+	 * first chip / input row. */
+	inset-block-start: var(--space-1);
 }
 
 [data-combobox-control]:has([data-combobox-selected-tags]:not([data-empty]))