fix(pwa): safe-area for Library + fix annotation-triggers-pageflip

- Library: add env(safe-area-inset-top) to both empty-state and main
  header so content isn't hidden behind iOS status bar
- Reader iframe touchend: add isSelectingRef.current guard before swipe
  page-turn — previously only currentSel check was present; on iOS the
  selection can be cleared before touchend fires, causing long-press
  annotation attempts to trigger page turn

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Retsomm

pwa/src/page/Library.tsx

@@ -68,7 +68,7 @@ const Library = ({ records, getCoverDataUrl, onAddBooks, onOpenBook, onRemoveBoo
   if (records.length === 0) {
     return (
       <div className="flex flex-col min-h-screen" style={{ background: paperBg, color: inkCol }}>
-        <div className="flex items-center justify-between px-4 py-3">
+        <div className="flex items-center justify-between px-4 py-3" style={{ paddingTop: 'max(env(safe-area-inset-top), 12px)' }}>
           <div className="flex-1" />
           <button className="p-2 rounded-full transition" style={{ color: ink3Col }} onClick={onToggleDark}>
             {darkMode ? <IconSun /> : <IconMoon />}
@@ -112,7 +112,7 @@ const Library = ({ records, getCoverDataUrl, onAddBooks, onOpenBook, onRemoveBoo
       <div className="flex flex-col min-h-screen" style={{ background: paperBg, color: inkCol }}>
 
         {/* ── Header ── */}
-        <div style={{ borderBottom: `1px solid ${borderCol}`, background: paperBg }}>
+        <div style={{ borderBottom: `1px solid ${borderCol}`, background: paperBg, paddingTop: 'env(safe-area-inset-top)' }}>
           {/* 第一行：Logo + 標題 + 操作按鈕 */}
           <div className="flex items-center gap-2 px-4 pt-3 pb-2">
             <div ref={logoMenuRef} style={{ position: 'relative', flexShrink: 0 }}>

pwa/src/page/Reader.tsx

@@ -511,7 +511,8 @@ const Reader = ({ bookPath, bookId, bookRecord, getCoverDataUrl, onBack, darkMod
             const dy = e.changedTouches[0].clientY - start.y
             swipeStartRef.current = null
             if (Math.abs(dx) < 50 || Math.abs(dx) < Math.abs(dy) * 1.5) return
-            // 有實際選取範圍（長按選字）時不翻頁
+            // 正在選取文字或有選取範圍時不翻頁
+            if (isSelectingRef.current) return
             const currentSel = doc.defaultView?.getSelection()
             if (currentSel && !currentSel.isCollapsed && currentSel.rangeCount > 0) return
             const isRtl = readingDirectionRef.current === 'rtl'