Perf/remove clipped subviews

[Faromzy]

perf: Enable removeClippedSubviews on ScrollView and FlatList

Summary

Adds removeClippedSubviews={true} to all scrollable list components to unmount
off-screen items from the native view hierarchy, reducing memory pressure and
improving scroll performance.

Changes

• FlatList — DownloadQueue, ConnectionManager, MobileSearch
• ScrollView — MobileProfile, LessonCarousel, PaymentHistory, BookmarkList,
  SubscriptionManager, MobileSettings, MobileCourseViewer, NotificationSettings,
  QuizCarousel, MobileRegister, MobileLogin, MobileSyllabus, FilterSheet,
  QuizResults, MobileQuizManager, MobileQuestionCard, AchievementBadges,
  GridFiltering, AdvancedDataGrid, app/(tabs)/index

Intentionally skipped:

• SearchHistory — scrollEnabled={false}, prop has no effect
• SettingsPicker — small bounded dropdown, not a long list
• parallax-scroll-view — uses Animated.ScrollView; prop could interfere with
  the parallax animation

Also fixes two pre-existing ESLint errors that were blocking the commit:

• Unescaped apostrophes in MobileProfile and MobileLogin
• Incorrect @/src/* import aliases in app/(tabs)/index.tsx (should be @/*)

Performance Impact

┌────────┬────────┬────────────────┐
│ Metric │ Before │ After (target) │
├────────────────────────────┼────────┼────────────────┤
│ Native views during scroll │ 500+ │ 20–30 │
├────────────────────────────┼────────┼────────────────┤
│ Reduction │ — │ ~95% │
└────────────────────────────┴────────┴────────────────┘

Testing

• Scroll through long lists and verify no rendering artifacts or layout flashes
• Confirm memory usage drops during heavy scroll sessions
• Check edge cases: fast fling, scroll to top/bottom, dynamic content updates
  closes Optimize ScrollView/FlatList rendering with removeClippedSubviews #250

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[RUKAYAT-CODER]

kindly resolve conflict and fix workflow.