feat(annotations): pass isResizable to AnnotationShape based on selection + transcribeMode

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

frontend/src/lib/components/AnnotationLayer.svelte

@@ -107,6 +107,7 @@ const containerStyle = $derived(
 			annotation={annotation}
 			isHovered={hoveredId === annotation.id}
 			isActive={annotation.id === activeAnnotationId}
+			isResizable={canDraw && annotation.id === activeAnnotationId && !annotation.polygon}
 			faded={!dimmed && !!activeAnnotationId && annotation.id !== activeAnnotationId}
 			dimmed={dimmed}
 			blockNumber={blockNumbers[annotation.id]}

frontend/src/lib/components/AnnotationLayer.svelte.test.ts

@@ -16,6 +16,17 @@ const annotation: Annotation = {
 	createdAt: '2026-01-01T00:00:00Z'
 };
 
+const polygonAnnotation: Annotation = {
+	...annotation,
+	id: 'ann-poly',
+	polygon: [
+		[0.1, 0.2],
+		[0.4, 0.21],
+		[0.39, 0.29],
+		[0.11, 0.28]
+	]
+};
+
 describe('AnnotationLayer', () => {
 	describe('dimmed prop', () => {
 		it('should hide block number badges when dimmed is true', async () => {
@@ -65,6 +76,60 @@ describe('AnnotationLayer', () => {
 		});
 	});
 
+	describe('isResizable computation', () => {
+		it('passes isResizable=true when canDraw, annotation is active, and has no polygon', async () => {
+			render(AnnotationLayer, {
+				annotations: [annotation],
+				canDraw: true,
+				color: '#00c7b1',
+				activeAnnotationId: 'ann-1',
+				onDraw: () => {}
+			});
+
+			const handles = document.querySelectorAll('[data-handle]');
+			expect(handles).toHaveLength(8);
+		});
+
+		it('passes isResizable=false when annotation has a polygon', async () => {
+			render(AnnotationLayer, {
+				annotations: [polygonAnnotation],
+				canDraw: true,
+				color: '#00c7b1',
+				activeAnnotationId: 'ann-poly',
+				onDraw: () => {}
+			});
+
+			const handles = document.querySelectorAll('[data-handle]');
+			expect(handles).toHaveLength(0);
+		});
+
+		it('passes isResizable=false when canDraw is false', async () => {
+			render(AnnotationLayer, {
+				annotations: [annotation],
+				canDraw: false,
+				color: '#00c7b1',
+				activeAnnotationId: 'ann-1',
+				onDraw: () => {}
+			});
+
+			const handles = document.querySelectorAll('[data-handle]');
+			expect(handles).toHaveLength(0);
+		});
+
+		it('passes isResizable=false when annotation is not active', async () => {
+			render(AnnotationLayer, {
+				annotations: [annotation],
+				canDraw: true,
+				color: '#00c7b1',
+				activeAnnotationId: 'other-id',
+				onDraw: () => {}
+			});
+
+			const handles = document.querySelectorAll('[data-handle]');
+			expect(handles).toHaveLength(0);
+		});
+	});
+
 	describe('flashAnnotationId prop', () => {
 		it('should apply annotation-flash class when flashAnnotationId matches', async () => {
 			render(AnnotationLayer, {