test(typeahead): note resetKey smoke-test limitation in spec comment

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/person/PersonTypeahead.svelte.spec.ts

@@ -273,6 +273,9 @@ describe('PersonTypeahead – correspondent mode', () => {
 // ─── resetKey ─────────────────────────────────────────────────────────────────
 
 describe('PersonTypeahead – resetKey', () => {
+	// Note: rerender() in vitest-browser-svelte causes a full re-mount, not an in-place prop
+	// update. This is a smoke test — the $effect(resetKey) path that fires during SvelteKit
+	// navigation (prop update on a live instance) cannot be isolated at this level.
 	it('clears a manually-typed term when resetKey changes even if initialName stays empty', async () => {
 		mockFetchWithPersons([]);
 		const { rerender } = render(PersonTypeahead, {