Blackboard Text 2.4.2

Bug fixes and polish. No data format changes: backups and links stay
compatible with 2.4.1. This version was tagged but not deployed on its own:
its fixes reached the website, and the extension zip, with 2.5.0.

Fixed

• Page actions → Name, emoji and delete… no longer closes the moment it
  opens. On phones, where there is no page rail, the panel now rises from the
  bottom of the screen, so pages can be renamed and deleted there again.
• An import, a snapshot restore or a page recovery could be silently undone
  if the tab was hidden while it was being written. The old pages are no
  longer written back over the new ones.
• Tab and Shift+Tab on a selection indent each line in place. They used to
  merge the selected lines into one and drop bold, italics and links.
• The first line of a note no longer runs into the second in TXT and
  Markdown exports, search results and page-history previews.
• Read-only tabs now follow the editing tab, so their backup export and
  shared copies include the latest saved work.
• Content dragged in from other pages is inserted as plain text, like paste,
  and unsaved content flushed when a tab closes is sanitized first.
• Autosave now also runs during long stretches of continuous typing (at most
  five seconds apart), not only after a pause.
• New pages no longer upset the order of pinned pages; moving a page keeps
  pinned pages first.
• The save status no longer stays on "Saving…" after clearing drawings.
• Dragging in the colour picker no longer floods the recent colours.
• Offline use: the service worker skips the browser cache when installing an
  update, no longer stores every opened shared link separately, and opens the
  right page for a short link while offline.
• A non-JSON answer from the short-link service shows a readable error.

Changed

• Russian interface: many missing translations (status messages, errors,
  screen-reader labels), correct plural forms ("3 страницы", "22 слова"),
  dates in the interface language, and buttons that no longer overflow. The
  language follows the browser until you choose one, and the selector moved
  under the themes.
• Keyboard: opening Settings from the keyboard moves focus into the panel;
  in Find a page, Enter opens the first result and the arrow keys move
  through the results.
• Touch screens get 44px targets for Settings, dialog and reader controls.
• Shared notes without drawings open in Readable text on phones.
• Exported files are named after the page name or its first line.
• Every GitHub Release now includes a ready-to-load extension zip
  (blackboard-text-extension-<version>.zip) with a SHA-256 checksum.
• New README, this changelog, and fresh screenshots.