fix: use full tag path in drag-drop toasts, fresh email in context menu markAsRead

Nested tag toasts from drag-and-drop only showed the leaf name for
non-root tags, contradicting the comment above it and making two
same-named leaves under different parents (e.g. Personal/Receipts vs
Work/Receipts) indistinguishable in the toast.

The context menu's markAsRead handler was the one action left reading
the stale contextMenu.data instead of the live-refreshed
contextMenuEmail introduced alongside it, so it could act on outdated
email state while every sibling handler was already updated.

components/email/email-list.tsx

@@ -598,7 +598,7 @@ export function EmailList({
           onReplyAll={() => onReplyAll?.(contextMenuEmail!)}
           onForward={() => onForward?.(contextMenuEmail!)}
           onForwardAsAttachment={() => onForwardAsAttachment?.(contextMenuEmail!)}
-          onMarkAsRead={(read) => onMarkAsRead?.(contextMenu.data!, read)}
+          onMarkAsRead={(read) => onMarkAsRead?.(contextMenuEmail!, read)}
           onToggleStar={() => onToggleStar?.(contextMenuEmail!)}
           onTogglePinned={onTogglePinned ? () => onTogglePinned(contextMenuEmail!) : undefined}
           onDelete={() => onDelete?.(contextMenuEmail!)}

components/layout/sidebar.tsx

@@ -609,21 +609,26 @@ function TagItem({
   // Nested rows are placed by their indentation, so they show their own name.
   // A root spells out its path, which matters when an intermediate tag is
   // missing from this client's settings and the row would otherwise read as a
-  // bare leaf name. Toasts have the room for the whole thing.
+  // bare leaf name.
   const labelCandidates = node.depth === 0 ? tagNameCandidates(node.id) : [node.label];
   const label = labelCandidates[0];
+  // Toasts have the room for the whole thing, and no indentation to lean on,
+  // so they always spell out the full path - otherwise two leaves with the
+  // same name in different branches (e.g. "Personal/Receipts" and
+  // "Work/Receipts") would read as the same tag.
+  const fullLabel = tagNameCandidates(node.id)[0];
   const { isDragging: globalDragging } = useDragDropContext();
   const { dropHandlers, isValidDropTarget } = useTagDrop({
     tagId: node.id,
     onSuccess: (count) => {
       if (count === 1) {
-        toast.success(t('email_tagged'), label);
+        toast.success(t('email_tagged'), fullLabel);
       } else {
-        toast.success(t('emails_tagged', { count }), label);
+        toast.success(t('emails_tagged', { count }), fullLabel);
       }
     },
     onError: () => {
-      toast.error(t('tag_failed'), label);
+      toast.error(t('tag_failed'), fullLabel);
     },
   });