test(ai-toolbar): complete modifier and dedup coverage

tests/ai-toolbar.test.ts

@@ -502,6 +502,20 @@ describe("AI toolbar paste capture", () => {
 		expect(imageTriggerOpen).toHaveBeenCalledTimes(1);
 	});
 
+	test("Shift+Cmd+A also opens the image picker when the composer is idle", async () => {
+		const { textareaProps, imageTriggerOpen } = await renderToolbarBoundary();
+		const metaEvent = createTextareaKeydownEvent({
+			key: "A",
+			metaKey: true,
+			shiftKey: true,
+		});
+
+		textareaProps.onKeyDown?.(metaEvent);
+
+		expect(metaEvent.preventDefault).toHaveBeenCalledTimes(1);
+		expect(imageTriggerOpen).toHaveBeenCalledTimes(1);
+	});
+
 	test("Shift+Mod+A stays disabled while generation is in progress", async () => {
 		const { textareaProps, imageTriggerOpen } = await renderToolbarBoundary({
 			aiLoading: true,
@@ -592,7 +606,7 @@ describe("AI toolbar paste capture", () => {
 		expect(onImagesSelect.mock.calls[0]?.[0][0]?.type).toBe("image/png");
 	});
 
-	test("async clipboard fallback does not double-handle a paste already captured by the synchronous paste event", async () => {
+	test("async clipboard fallback does not double-handle a paste already handled by the synchronous document paste flow", async () => {
 		const onImagesSelect = mock();
 		const clipboardRead = mock(async () => [
 			{
@@ -611,24 +625,35 @@ describe("AI toolbar paste capture", () => {
 			"paste",
 			(entry) => entry.options?.capture === true,
 		);
+		const handleDocumentPaste = getDocumentListener(
+			"paste",
+			(entry) => !entry.options?.capture,
+		);
 		const handleDocumentKeydown = getDocumentListener("keydown");
 		const image = new File(["image-bytes"], "clipboard.png", {
 			type: "image/png",
 		});
+		const preventDefault = mock();
 
 		const keydownPromise = handleDocumentKeydown(
 			createDocumentKeydownEvent({ ctrlKey: true }),
 		);
 
-		handleCapturePaste({
+		const pasteEvent = {
 			target: { tagName: "DIV", isContentEditable: false },
 			clipboardData: createClipboardData([image]),
-		} as unknown as Event);
+			preventDefault,
+		} as unknown as Event;
+
+		handleCapturePaste(pasteEvent);
+		handleDocumentPaste(pasteEvent);
 
 		await keydownPromise;
 
+		expect(preventDefault).toHaveBeenCalledTimes(1);
 		expect(clipboardRead).not.toHaveBeenCalled();
-		expect(onImagesSelect).not.toHaveBeenCalled();
+		expect(onImagesSelect).toHaveBeenCalledTimes(1);
+		expect(onImagesSelect).toHaveBeenCalledWith([image]);
 	});
 
 	test("global paste listeners only arm when AI paste capture is usable, and disarm on cleanup", async () => {