Reword schema-picker placeholder to "Select a schema" and make it full-width

The picker now browses on click, so "Select a schema" reads better than "Search
for a schema". Rename the now-shared message (used by the relation editor's target
schema and the subject creator) from the subject-creator-specific key to a neutral
neowiki-schema-lookup-placeholder, and document it in qqq. Stretch the CdxCombobox
to full width so it matches the other fields in the editor.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: JeroenDeDauw

extension.json

@@ -413,7 +413,7 @@
 				"neowiki-subject-creator-schema-title",
 				"neowiki-subject-creator-existing-schema",
 				"neowiki-subject-creator-new-schema",
-				"neowiki-subject-creator-schema-search-placeholder",
+				"neowiki-schema-lookup-placeholder",
 				"neowiki-schema-display-property-name",
 				"neowiki-schema-display-property-type",
 				"neowiki-schema-display-property-required",

i18n/en.json

@@ -103,7 +103,7 @@
 	"neowiki-subject-creator-schema-title": "Have an existing schema?",
 	"neowiki-subject-creator-existing-schema": "Use existing",
 	"neowiki-subject-creator-new-schema": "Create new",
-	"neowiki-subject-creator-schema-search-placeholder": "Search for a schema",
+	"neowiki-schema-lookup-placeholder": "Select a schema",
 	"neowiki-subject-creator-label-field": "Subject label",
 	"neowiki-subject-creator-label-placeholder": "Enter a label for the subject",
 	"neowiki-subject-creator-save": "Create subject",

i18n/qqq.json

@@ -52,6 +52,7 @@
 	"neowiki-subject-editor-error": "Error notification title shown when updating a subject fails. $1 is the subject label.",
 	"neowiki-subject-editor-validation-failed": "Toast title shown when the backend rejects a Subject save under enforcement. $1 is the Subject label.",
 	"neowiki-subject-lookup-placeholder": "Placeholder text shown in the subject search input field.",
+	"neowiki-schema-lookup-placeholder": "Placeholder text shown in the schema picker input field.",
 	"neowiki-subject-lookup-no-results": "Message shown in the subject lookup dropdown when no subjects match the search query.",
 	"neowiki-subject-lookup-no-match": "Error message shown in the subject lookup when the user types text but does not select a subject from the dropdown results.",
 

resources/ext.neowiki/src/components/common/SchemaLookup.vue

@@ -4,7 +4,7 @@
 			ref="comboboxRef"
 			v-model:selected="selectedSchema"
 			:menu-items="menuItems"
-			:placeholder="$i18n( 'neowiki-subject-creator-schema-search-placeholder' ).text()"
+			:placeholder="$i18n( 'neowiki-schema-lookup-placeholder' ).text()"
 			@input="filterSchemas"
 			@update:selected="onSelect"
 			@blur="reconcileOnBlur"
@@ -89,3 +89,9 @@ function focus(): void {
 
 defineExpose( { focus } );
 </script>
+
+<style lang="less">
+.ext-neowiki-schema-lookup .cdx-combobox {
+	width: 100%;
+}
+</style>