chore: add roles to edges

packages/svelte/src/lib/components/EdgeLabel/EdgeLabel.svelte

@@ -36,8 +36,6 @@
   style:width={toPxString(width)}
   style:height={toPxString(height)}
   style:z-index={z}
-  role="group"
-  aria-roledescription="edge label"
   tabindex="-1"
   onclick={() => {
     if (selectEdgeOnClick && id) store.handleEdgeSelection(id);

packages/svelte/src/lib/components/EdgeWrapper/EdgeWrapper.svelte

@@ -137,7 +137,8 @@
           ? ariaLabel
           : `Edge from ${source} to ${target}`}
       aria-describedby={focusable ? `${ARIA_EDGE_DESC_KEY}-${store.flowId}` : undefined}
-      role={focusable ? 'button' : 'img'}
+      role={edge.ariaRole === null ? undefined : edge.ariaRole || (focusable ? 'group' : 'img')}
+      aria-roledescription={edge.ariaRoleDescription || 'edge'}
       onkeydown={focusable ? onkeydown : undefined}
       tabindex={focusable ? 0 : undefined}
     >