feat(webui): add central selection list

webui/tests/selection-list.test.tsx

@@ -0,0 +1,52 @@
+function assert(condition: unknown, message = "assertion failed"): void {
+  if (!condition) throw new Error(message);
+}
+
+import { renderToStaticMarkup } from "react-dom/server";
+import SelectionList, { SelectionListItem } from "../src/components/SelectionList";
+import { PlatformLanguageProvider } from "../src/i18n/LanguageContext";
+
+function noop() {}
+
+const markup = renderToStaticMarkup(
+  <PlatformLanguageProvider>
+    <SelectionList label="i18n:govoplan-core.notifications.753a22b2" className="domain-list" data-source="inbox">
+      <SelectionListItem
+        selected
+        className="domain-row"
+        draggable
+        data-record-id="record-1"
+        onDragStart={noop}
+        onClick={noop}
+      >
+        <strong>Primary content</strong>
+        <small>Supporting content</small>
+      </SelectionListItem>
+      <SelectionListItem selected={false} disabled>
+        Disabled content
+      </SelectionListItem>
+    </SelectionList>
+  </PlatformLanguageProvider>
+);
+
+assert(markup.includes('role="listbox"'), "the root exposes listbox semantics");
+assert(markup.includes('class="selection-list domain-list"'), "root caller classes are preserved");
+assert(markup.includes('data-source="inbox"'), "root native properties pass through");
+assert(markup.includes('aria-label="Notifications"'), "the accessible label is translated");
+assert(markup.includes('role="option"'), "items expose option semantics");
+assert(markup.includes('aria-selected="true"'), "selected state is exposed accessibly");
+assert(markup.includes('class="selection-list-item is-selected domain-row"'), "selected and domain classes are composed");
+assert(markup.includes('draggable="true"'), "native draggable properties pass through");
+assert(markup.includes('data-record-id="record-1"'), "native data properties pass through");
+assert(markup.includes("<strong>Primary content</strong><small>Supporting content</small>"), "React node content is preserved");
+assert(markup.includes('type="button"'), "items default to non-submitting buttons");
+assert(markup.includes('aria-selected="false"'), "unselected state is exposed accessibly");
+assert(markup.includes('aria-disabled="true"'), "disabled state is exposed accessibly");
+assert(markup.includes('disabled=""'), "disabled state uses the native button contract");
+
+const nativeLabelMarkup = renderToStaticMarkup(
+  <SelectionList aria-label="Already translated">
+    <SelectionListItem selected={false}>Content</SelectionListItem>
+  </SelectionList>
+);
+assert(nativeLabelMarkup.includes('aria-label="Already translated"'), "native accessible labels pass through unchanged");