Easier navigation on iPhone

- Phones get a bottom tab bar (Studies, Bible, Plans, Prayer, Account); wider screens keep the header nav
- The Account menu opens upward from the bar; toasts sit above it
- Reader and study pages get a labelled Home button instead of a small arrow

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/components/reader/HomeButton.jsx

@@ -0,0 +1,11 @@
+import { HomeIcon } from './icons.jsx';
+
+// The way back to the dashboard from the Reader and from a study. Always labelled, and big enough to hit with a thumb.
+export default function HomeButton({ onClick }) {
+  return (
+    <button type="button" onClick={onClick} aria-label="Back to home" data-tip="Back to home"
+      className="flex h-10 shrink-0 items-center gap-1.5 rounded-full border border-[var(--r-line)] px-3 text-sm text-[var(--r-text)] transition hover:bg-black/5">
+      <HomeIcon /><span>Home</span>
+    </button>
+  );
+}

src/components/reader/ReaderBars.jsx

@@ -1,6 +1,7 @@
 // Top and bottom chrome for the reader. Everything stays one tap away; focus
 // mode hides both.
 import { ChevronLeft, ChevronRight, ChevronDown, SearchIcon, LinkIcon, PenIcon, HeadphonesIcon, FocusIcon, CheckIcon, CompareIcon, HighlighterIcon } from './icons.jsx';
+import HomeButton from './HomeButton.jsx';
 import { BookmarkIcon } from '../../utils/bibleUtils.jsx';
 
 const iconBtn = 'flex h-9 w-9 items-center justify-center rounded-lg text-[var(--r-sub)] transition hover:bg-black/5 disabled:opacity-30 disabled:hover:bg-transparent';
@@ -9,7 +10,7 @@ export function TopBar({ title, onBack, onOpenNavigator, onSearch, onBookmarks,
   return (
     <div className="safe-top sticky top-0 z-30 border-b border-[var(--r-line)] bg-[var(--r-bar)] font-sans">
       <div className="mx-auto flex h-12 max-w-4xl items-center gap-1 px-2">
-        <button type="button" onClick={onBack} className="flex h-9 items-center gap-0.5 rounded-lg pl-1 pr-2 text-[var(--r-sub)] transition hover:bg-black/5" aria-label="Back to home" data-tip="Back to home"><ChevronLeft /><span className="hidden text-xs sm:inline">Home</span></button>
+        <HomeButton onClick={onBack} />
         <button type="button" onClick={onOpenNavigator}
           className="mx-auto flex min-w-0 items-center gap-1.5 rounded-lg px-3 py-1.5 text-sm font-medium text-[var(--r-text)] hover:bg-black/5" data-tip="Go to a book and chapter (G)">
           <span className="truncate">{title}</span><ChevronDown />

src/components/reader/icons.jsx

@@ -2,6 +2,7 @@
 const base = { viewBox: '0 0 20 20', width: 20, height: 20, fill: 'none', stroke: 'currentColor', strokeWidth: 1.6, strokeLinecap: 'round', strokeLinejoin: 'round', 'aria-hidden': true };
 
 export const ChevronLeft = () => <svg {...base}><path d="M12 4l-6 6 6 6" /></svg>;
+export const HomeIcon = () => <svg {...base}><path d="M3.5 9.5L10 4l6.5 5.5M5 8.5V16h3.5v-4h3v4H15V8.5" /></svg>;
 export const ChevronRight = () => <svg {...base}><path d="M8 4l6 6-6 6" /></svg>;
 export const ChevronDown = ({ size = 14 }) => <svg {...base} width={size} height={size}><path d="M5 8l5 5 5-5" /></svg>;
 export const SearchIcon = () => <svg {...base}><circle cx="9" cy="9" r="5.5" /><path d="M13.5 13.5L17 17" /></svg>;