fix: visit synthetic value node during ssr (#17824)

Closes #17821

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Author: paoloricciuti

.changeset/itchy-carpets-watch.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: visit synthetic value node during ssr

packages/svelte/src/compiler/phases/3-transform/server/visitors/RegularElement.js

@@ -126,7 +126,7 @@ export function RegularElement(node, context) {
 
 		if (node.metadata.synthetic_value_node) {
 			body = optimiser.transform(
-				node.metadata.synthetic_value_node.expression,
+				/** @type {Expression} */ (context.visit(node.metadata.synthetic_value_node.expression)),
 				node.metadata.synthetic_value_node.metadata.expression
 			);
 		} else {

packages/svelte/tests/server-side-rendering/samples/select-option-store-implicit-value/_expected.html

@@ -0,0 +1 @@
+<!--[--><select><option>Dog</option><option>cat</option></select><!--]-->

packages/svelte/tests/server-side-rendering/samples/select-option-store-implicit-value/main.svelte

@@ -0,0 +1,11 @@
+<script>
+	import { writable } from 'svelte/store';
+
+	const value = writable('dog');
+	const label = writable('Dog');
+</script>
+
+<select bind:value={$value}>
+	<option>{$label}</option>
+	<option>cat</option>
+</select>

packages/svelte/tests/server-side-rendering/samples/select-option-store-text-content/_expected.html

@@ -0,0 +1 @@
+<!--[--><select><option disabled="" value="" selected="">placeholder</option><option value="a">A</option><option value="b">B</option></select><!--]-->

packages/svelte/tests/server-side-rendering/samples/select-option-store-text-content/main.svelte

@@ -0,0 +1,13 @@
+<script>
+	import { readable } from 'svelte/store';
+
+	const t = readable((/** @type {string} */ key) => key);
+
+	let value = $state('');
+</script>
+
+<select bind:value>
+	<option disabled value="">{$t('placeholder')}</option>
+	<option value="a">A</option>
+	<option value="b">B</option>
+</select>