fix: collapse focus mail layout to multi-line on mobile

components/email/email-list-item.tsx

@@ -50,7 +50,9 @@ export function EmailListItem({ email, selected, onClick, onDoubleClick, onConte
   const currentMailboxRole = mailboxes.find(mb => mb.id === selectedMailbox)?.role;
   const showRecipient = currentMailboxRole === 'sent' || currentMailboxRole === 'drafts';
   const sender = showRecipient ? (email.to?.[0] ?? email.from?.[0]) : email.from?.[0];
-  const isFocusedMailLayout = mailLayout === 'focus';
+  const isMobile = useUIStore((state) => state.isMobile);
+  // The horizontal one-line "focus" layout doesn't fit on narrow screens; fall back to multi-line on mobile.
+  const isFocusedMailLayout = mailLayout === 'focus' && !isMobile;
   const hideJunkAvatarImages = currentMailboxRole === 'junk' && !showAvatarsInJunk;
   const trimmedPreview = stripInvisibleLeading(email.preview ?? '');
   const inlinePreview = showPreview && trimmedPreview ? ` ${trimmedPreview}` : '';
@@ -68,8 +70,6 @@ export function EmailListItem({ email, selected, onClick, onDoubleClick, onConte
     sourceMailboxId: selectedMailbox,
   });
 
-  const isMobile = useUIStore((state) => state.isMobile);
-
   const { onTouchStart, onTouchEnd, onTouchMove, onTouchCancel, isPressed } = useLongPress(
     useCallback((pos) => {
       onContextMenu?.(

components/email/email-list.tsx

@@ -11,6 +11,7 @@ import { ConfirmDialog } from "@/components/ui/confirm-dialog";
 import { useEmailStore } from "@/stores/email-store";
 import { useAuthStore } from "@/stores/auth-store";
 import { useSettingsStore } from "@/stores/settings-store";
+import { useUIStore } from "@/stores/ui-store";
 import { groupEmailsByThread, sortThreadGroups } from "@/lib/thread-utils";
 import { useContextMenu } from "@/hooks/use-context-menu";
 import { useConfirmDialog } from "@/hooks/use-confirm-dialog";
@@ -107,7 +108,9 @@ export function EmailList({
   const density = useSettingsStore((state) => state.density);
   const showPreview = useSettingsStore((state) => state.showPreview);
   const mailLayout = useSettingsStore((state) => state.mailLayout);
-  const isFocusedMailLayout = mailLayout === 'focus';
+  const isMobile = useUIStore((state) => state.isMobile);
+  // Match the list items: focus layout collapses to multi-line on mobile, so virtualizer estimates must match.
+  const isFocusedMailLayout = mailLayout === 'focus' && !isMobile;
 
   const estimateSize = useCallback(() => {
     if (isFocusedMailLayout) {

components/email/thread-list-item.tsx

@@ -73,7 +73,9 @@ const SingleEmailItem = React.forwardRef<HTMLDivElement, SingleEmailItemProps>(
     const getAccountById = useAccountStore((state) => state.getAccountById);
     const accountColor = email.accountId ? getAccountById(email.accountId)?.avatarColor : undefined;
     const isChecked = selectedEmailIds.has(email.id);
-    const isFocusedMailLayout = mailLayout === 'focus';
+    const isMobile = useUIStore((state) => state.isMobile);
+    // The horizontal one-line "focus" layout doesn't fit on narrow screens; fall back to multi-line on mobile.
+    const isFocusedMailLayout = mailLayout === 'focus' && !isMobile;
     const trimmedPreview = stripInvisibleLeading(email.preview ?? '');
     const inlinePreview = showPreview && trimmedPreview ? ` ${trimmedPreview}` : '';
 
@@ -91,8 +93,6 @@ const SingleEmailItem = React.forwardRef<HTMLDivElement, SingleEmailItemProps>(
       sourceMailboxId: selectedMailbox,
     });
 
-    const isMobile = useUIStore((state) => state.isMobile);
-
     const { onTouchStart, onTouchEnd, onTouchMove, onTouchCancel, isPressed } = useLongPress(
       useCallback((pos) => {
         onContextMenu?.(
@@ -377,7 +377,8 @@ export const ThreadListItem = React.forwardRef<HTMLDivElement, ThreadListItemPro
     const showAvatarsInJunk = useSettingsStore((state) => state.showAvatarsInJunk);
     const isMobile = useUIStore((state) => state.isMobile);
     const { latestEmail, participantNames, hasUnread, hasStarred, hasAttachment, hasAnswered, hasForwarded, emailCount } = thread;
-    const isFocusedMailLayout = mailLayout === 'focus';
+    // The horizontal one-line "focus" layout doesn't fit on narrow screens; fall back to multi-line on mobile.
+    const isFocusedMailLayout = mailLayout === 'focus' && !isMobile;
     const trimmedPreview = stripInvisibleLeading(latestEmail.preview ?? '');
     const inlinePreview = showPreview && trimmedPreview ? ` ${trimmedPreview}` : '';