Fix eval-flag-dialog infinite effect loop on open

The `storeBump++` inside the effect read + wrote the same state, making
it a tracked dependency that re-fired the effect — exceeding Svelte's
update depth and freezing the page so the dialog Close button couldn't
fire. Wrap the body in untrack() so only `open` is observed.

src/lib/components/eval-flag-dialog.svelte

@@ -17,6 +17,7 @@
 	import ClipboardIcon from 'phosphor-svelte/lib/ClipboardIcon';
 	import TrashIcon from 'phosphor-svelte/lib/TrashIcon';
 	import { toast } from 'svelte-sonner';
+	import { untrack } from 'svelte';
 
 	interface Props {
 		open?: boolean;
@@ -33,13 +34,19 @@
 	// Bumped to refresh the counts when the user copies/clears or saves a flag.
 	let storeBump = $state(0);
 
+	// Watch only `open`; everything inside is untracked so writes (especially
+	// `storeBump++` which is a read+write) don't make the effect re-trigger
+	// itself into an infinite loop.
 	$effect(() => {
-		if (!open) {
-			reason = null;
-			note = '';
-		} else {
-			storeBump++;
-		}
+		const isOpen = open;
+		untrack(() => {
+			if (!isOpen) {
+				reason = null;
+				note = '';
+			} else {
+				storeBump++;
+			}
+		});
 	});
 
 	const flagsCount = $derived.by(() => {