feat(annotations): add isResizable prop to AnnotationShape to render edit overlay

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

frontend/src/lib/components/AnnotationShape.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 import type { Annotation } from '$lib/types';
+import AnnotationEditOverlay from './AnnotationEditOverlay.svelte';
 
 let {
 	annotation,
@@ -9,6 +10,7 @@ let {
 	dimmed = false,
 	blockNumber = undefined,
 	isFlashing = false,
+	isResizable = false,
 	onclick,
 	onpointerenter,
 	onpointerleave
@@ -20,6 +22,7 @@ let {
 	dimmed?: boolean;
 	blockNumber?: number | undefined;
 	isFlashing?: boolean;
+	isResizable?: boolean;
 	onclick: () => void;
 	onpointerenter: () => void;
 	onpointerleave: () => void;
@@ -109,6 +112,9 @@ let shapeStyle = $derived(
 			{blockNumber}
 		</div>
 	{/if}
+	{#if isResizable}
+		<AnnotationEditOverlay annotation={annotation} />
+	{/if}
 </div>
 
 <style>