Emdash source with visual editor image upload fix

Fixes:
1. media.ts: wrap placeholder generation in try-catch
2. toolbar.ts: check r.ok, display error message in popover

packages/admin/src/components/ArrowIcons.tsx

@@ -0,0 +1,23 @@
+import { ArrowRightIcon, CaretRightIcon, type IconProps } from "@phosphor-icons/react";
+
+import { cn } from "../lib/utils";
+
+/** Caret pointing in the "forward" direction — right in LTR, left in RTL. */
+export function CaretNext({ className, ...props }: IconProps) {
+	return <CaretRightIcon className={cn("rtl:-scale-x-100", className)} {...props} />;
+}
+
+/** Caret pointing in the "backward" direction — left in LTR, right in RTL. */
+export function CaretPrev({ className, ...props }: IconProps) {
+	return <CaretRightIcon className={cn("rotate-180 rtl:rotate-0", className)} {...props} />;
+}
+
+/** Arrow pointing in the "forward" direction — right in LTR, left in RTL. */
+export function ArrowNext({ className, ...props }: IconProps) {
+	return <ArrowRightIcon className={cn("rtl:-scale-x-100", className)} {...props} />;
+}
+
+/** Arrow pointing in the "backward" direction — left in LTR, right in RTL. */
+export function ArrowPrev({ className, ...props }: IconProps) {
+	return <ArrowRightIcon className={cn("rotate-180 rtl:rotate-0", className)} {...props} />;
+}