fix(ai-toolbar): align attach and fallback modifier rules

tests/ai-toolbar.test.ts

@@ -600,6 +600,36 @@ describe("AI toolbar paste capture", () => {
 		expect(imageTriggerOpen).toHaveBeenCalledTimes(1);
 	});
 
+	test("Shift+Mod+A ignores Alt-modified submissions", async () => {
+		const { textareaProps, imageTriggerOpen } = await renderToolbarBoundary();
+		const event = createTextareaKeydownEvent({
+			key: "A",
+			ctrlKey: true,
+			shiftKey: true,
+			altKey: true,
+		});
+
+		textareaProps.onKeyDown?.(event);
+
+		expect(event.preventDefault).not.toHaveBeenCalled();
+		expect(imageTriggerOpen).not.toHaveBeenCalled();
+	});
+
+	test("Shift+Mod+A ignores combined Ctrl+Meta modifiers", async () => {
+		const { textareaProps, imageTriggerOpen } = await renderToolbarBoundary();
+		const event = createTextareaKeydownEvent({
+			key: "A",
+			ctrlKey: true,
+			metaKey: true,
+			shiftKey: true,
+		});
+
+		textareaProps.onKeyDown?.(event);
+
+		expect(event.preventDefault).not.toHaveBeenCalled();
+		expect(imageTriggerOpen).not.toHaveBeenCalled();
+	});
+
 	test("Shift+Mod+A stays disabled while generation is in progress", async () => {
 		const { textareaProps, imageTriggerOpen } = await renderToolbarBoundary({
 			aiLoading: true,
@@ -693,6 +723,31 @@ describe("AI toolbar paste capture", () => {
 		expect(onImagesSelect.mock.calls[0]?.[0][0]?.type).toBe("image/png");
 	});
 
+	test("Cmd+V fallback forwards clipboard images for non-editable targets", async () => {
+		const onImagesSelect = mock();
+		const clipboardRead = mock(async () => [
+			{
+				types: ["image/png"],
+				getType: async () => new Blob(["image-bytes"], { type: "image/png" }),
+			},
+		]);
+
+		(globalThis as { navigator?: Navigator }).navigator = {
+			clipboard: { read: clipboardRead },
+		} as Navigator;
+
+		await renderToolbar({ onImagesSelect });
+
+		const handleDocumentKeydown = getDocumentListener("keydown");
+
+		await handleDocumentKeydown(
+			createDocumentKeydownEvent({ metaKey: true }),
+		);
+
+		expect(clipboardRead).toHaveBeenCalledTimes(1);
+		expect(onImagesSelect).toHaveBeenCalledTimes(1);
+	});
+
 	test("Ctrl+Meta+V does not trigger the async clipboard fallback", async () => {
 		const onImagesSelect = mock();
 		const clipboardRead = mock(async () => []);
@@ -857,6 +912,9 @@ describe("AI toolbar paste capture", () => {
 		expect(syncOnImagesSelect.mock.calls[0]?.[0][0]?.name).toBe(
 			asyncOnImagesSelect.mock.calls[0]?.[0][0]?.name,
 		);
+		expect(syncOnImagesSelect.mock.calls[0]?.[0][0]?.size).toBe(
+			asyncOnImagesSelect.mock.calls[0]?.[0][0]?.size,
+		);
 		expect(syncOnImagesSelect.mock.calls[0]?.[0][0]?.lastModified).toBe(
 			asyncOnImagesSelect.mock.calls[0]?.[0][0]?.lastModified,
 		);