fix: lift toasts above the quick reply box and a docked reply while they are on screen

The toast-layout assertion changes because toasts now clear a bar taller
than 5rem while a composer is open, instead of a fixed 5rem.

components/email/__tests__/viewer-quick-reply-back.test.tsx

@@ -63,6 +63,19 @@ describe('quick reply', () => {
   });
 });
 
+// mail-p2-12: toasts covered the right half of the quick reply box.
+describe('quick reply and toasts', () => {
+  it('counts as a bottom bar, so toasts sit above it', async () => {
+    document.documentElement.style.removeProperty('--bottom-controls-height');
+    const { unmount } = render(<EmailViewer email={message} isLoading={false} mailboxes={mailboxes} selectedMailbox="inbox" currentMailboxRole="inbox" onQuickReply={vi.fn()} />);
+    await act(async () => { await new Promise((r) => setTimeout(r, 30)); });
+    expect(document.querySelector('[data-quick-reply-box]')).not.toBeNull();
+    expect(document.documentElement.style.getPropertyValue('--bottom-controls-height')).not.toBe('');
+    unmount();
+    expect(document.documentElement.style.getPropertyValue('--bottom-controls-height')).toBe('');
+  });
+});
+
 // mail-p2-8: Undo send on a quick reply brings its text back into this box.
 describe('quick reply after Undo send', () => {
   it('takes the undone text back into the box of the message it answered', async () => {

components/email/email-viewer.tsx

@@ -1827,7 +1827,16 @@ export function EmailViewer({
   const [quickReplyText, setQuickReplyText] = useState("");
   const quickReplyRef = useRef<HTMLTextAreaElement>(null);
   const [isQuickReplyFocused, setIsQuickReplyFocused] = useState(false);
-  const quickReplyBoxRef = useRef<HTMLDivElement>(null);
+  const quickReplyBoxRef = useRef<HTMLDivElement | null>(null);
+  // Toasts ("Archived · Undo", "Sending in 5 seconds") sit above the quick
+  // reply box while it is on screen, not over it (mail-p2-12).
+  const [quickReplyBoxShown, setQuickReplyBoxShown] = useState(false);
+  const quickReplyBarRef = useBottomControls(quickReplyBoxShown);
+  const setQuickReplyBox = useCallback((el: HTMLDivElement | null) => {
+    quickReplyBoxRef.current = el;
+    setQuickReplyBoxShown(!!el);
+    quickReplyBarRef(el);
+  }, [quickReplyBarRef]);
   // Focused, the box grows by its buttons: bring them up, they'd sit below the fold.
   useEffect(() => {
     if (isQuickReplyFocused) quickReplyBoxRef.current?.scrollIntoView?.({ block: 'nearest' });
@@ -6393,7 +6402,7 @@ ${printWatermark ? printWatermark.html : ''}
           )}
 
           {/* Quick Reply Section - hidden for drafts and while loading a new email */}
-          {showQuickReply && (<div ref={quickReplyBoxRef} className="bg-background border-t border-border px-6 mt-auto max-sm:scroll-mb-16" style={{ paddingBlock: 'var(--density-header-py)' }}>
+          {showQuickReply && (<div ref={setQuickReplyBox} data-quick-reply-box="" className="bg-background border-t border-border px-6 mt-auto max-sm:scroll-mb-16" style={{ paddingBlock: 'var(--density-header-py)' }}>
             <div className="flex items-start" style={{ gap: 'var(--density-item-gap)' }}>
               <div className="flex-shrink-0">
                 <Avatar

components/mail/reply-dock.tsx

@@ -4,6 +4,7 @@ import { useLayoutEffect, useRef, useState, type ReactNode } from "react";
 import { useTranslations } from "next-intl";
 import { ChevronDown, ChevronUp } from "@/components/icons";
 import { cn } from "@/lib/utils";
+import { useBottomControls } from "@/hooks/use-bottom-controls";
 
 /**
  * Below this reading-pane height a docked reply can't share the pane with
@@ -34,6 +35,8 @@ export function ReplyDock({ children }: { children: ReactNode }) {
   // The reader's toolbar and subject above its scrolling part: they stay.
   const [readerChrome, setReaderChrome] = useState(0);
   const [showMessage, setShowMessage] = useState(false);
+  // Toasts sit above the reply and its Send button (mail-p2-12).
+  const barRef = useBottomControls();
 
   useLayoutEffect(() => {
     const pane = ref.current?.parentElement;
@@ -78,7 +81,7 @@ export function ReplyDock({ children }: { children: ReactNode }) {
         </button>
       )}
       {/* Folded, the composer stays mounted, with its text and its undo history. */}
-      <div className={cn("flex min-h-0 flex-1 flex-col", folded && "hidden")}>
+      <div ref={barRef} className={cn("flex min-h-0 flex-1 flex-col", folded && "hidden")}>
         {children}
       </div>
     </div>

components/ui/__tests__/toast-layout.test.tsx

@@ -40,7 +40,7 @@ describe('toast layout', () => {
     render(<Toasts />);
     const container = toastContainer();
     expect(container.className).toContain('max-sm:bottom-[calc(var(--bottom-controls-height,3.75rem)+0.75rem)]');
-    expect(container).toHaveClass('[html[data-composer-open]_&]:bottom-20');
+    expect(container).toHaveClass('[html[data-composer-open]_&]:bottom-[max(5rem,calc(var(--bottom-controls-height,0px)+0.75rem))]');
   });
 
   it('sits above a registered bottom bar on the desktop too, such as a form footer', () => {

components/ui/toast.tsx

@@ -474,7 +474,7 @@ export function ToastContainer({ toasts, onClose }: { toasts: Toast[]; onClose:
         // Newest at the bottom, at the end corner (bottom left in RTL);
         // lifted over a registered bottom bar (a form's Save/Cancel footer)
         // and over an open composer's footer.
-        "fixed bottom-[max(1.25rem,calc(var(--bottom-controls-height,0px)+0.75rem))] end-5 z-[99999] flex flex-col gap-2.5 [html[data-composer-open]_&]:bottom-20",
+        "fixed bottom-[max(1.25rem,calc(var(--bottom-controls-height,0px)+0.75rem))] end-5 z-[99999] flex flex-col gap-2.5 [html[data-composer-open]_&]:bottom-[max(5rem,calc(var(--bottom-controls-height,0px)+0.75rem))]",
         // Phone: full width with 12px margins, above the bottom controls
         // (the tab bar, or whichever bar registered with useBottomControls).
         "max-sm:inset-x-3 max-sm:bottom-[calc(var(--bottom-controls-height,3.75rem)+0.75rem)]",

hooks/use-bottom-controls.ts

@@ -48,9 +48,13 @@ export function useBottomControls(active = true): (el: HTMLElement | null) => vo
     const observer = typeof ResizeObserver === 'undefined' ? null : new ResizeObserver(schedule);
     observer?.observe(el);
     window.addEventListener('resize', schedule);
+    // A bar inside a scrolling pane (the quick reply under a message) moves
+    // when the pane scrolls.
+    window.addEventListener('scroll', schedule, { capture: true, passive: true });
     return () => {
       observer?.disconnect();
       window.removeEventListener('resize', schedule);
+      window.removeEventListener('scroll', schedule, { capture: true });
       bars.delete(el);
       update();
     };