Version 4.4 sent to AppStore (small improvements and fixes)

[petrjahoda]

■ New features
- Auto-Scroll. Books in scroll mode can scroll by themselves at a speed you pick, so you can read hands free. A floating button starts and stops it, and Settings has an Auto-Scroll page.
- Backup. Your reading progress, highlights, bookmarks, tags and covers export to a single file you can keep or carry to another device, and import back the same way.
- Wikipedia in Look Up. The look-up sheet gained a Wikipedia tab next to the dictionary. It asks the book's own language first, and English if that language has no article.
- Instant Highlight. Highlights save straight away in the color you used last. A switch in Settings brings back the old pick-a-color-first flow.
- A grace day for your streak. One missed day per calendar month no longer breaks your reading streak, and streaks you already lost that way repair themselves.
- PDF passwords are remembered. Unlock an encrypted PDF once and it opens straight away next time, cover and details included.
- Audiobook speed and smart rewind. Playback speed carries between books and sessions, and coming back after a break rewinds a few seconds so you can pick up the thread.
- Day and Night follow your device. The Day and Night color presets can switch themselves with light and dark mode.

■ Improvements
- Eye Health Reminders no longer interrupt. The break reminder is a small toast with a countdown instead of an alert you have to dismiss.
- Readwise highlights export by themselves when you close a book, once your token is saved.
- Calibre Books opens with a bar telling you how many books are new or changed, so syncing them is one tap.
- Help search matches hidden keywords, not just topic titles, so a word like voice or trash finds the right topic.
- The streak-at-risk banner on Home can switch the evening Streak Alert on right where the warning is.
- The library folder moved into Settings, with the current path and a way to change it.
- Get Free Books in the library menu says what the OPDS browser is for, and adding a server now accepts a bare address.

■ Fixes
- The reader close button could be invisible on a light-mode device with a dark book.
- The Lock Screen kept showing the finished chapter after playback rolled into the next one.
- The widget streak and goal ring roll over at midnight, and the streak counts today once the goal is met.
- A dismissed update banner stays dismissed.
- Opening a book file from another app now opens the book, not just the Library tab.

■ Localization
- All the new text is natively translated across all 18 supported languages.