Fixes and polish for game import.

• Lichess studies and blog posts: the annotated move list is now read correctly. Variations and analysis quoted between the moves no longer get mistaken for the game.
• Games that start from a custom position (studies, puzzles) open from that position.
• Chess960 and other variants are recognised and named instead of being shown as a wrong game.
• The position read from the image and the game read from the move list now sit side by side, each labelled with where it came from, with no scrolling.
• The move stepper shows the current pair of moves with the one on the board highlighted.

No new permissions, and reading a board from a screenshot is unchanged.

0.4.1

New: whole games. On a page that shows a game as a move list (chessgames.com, lichess, chess.com articles, blogs), fenshot finds it, checks every move is legal, and shows it on a small board you can step through with the arrows or the keyboard. One click opens the full game on Coachess or Lichess, or copies the PGN. Several games on one page? Page through them. Games with a custom starting position (studies, puzzles) are supported; Chess960 and other variants are recognised but not imported.

Changed: Coachess is now the primary analysis button, Lichess second. Links to Coachess carry a static utm_source=fenshot tag (no identifier, no data).

Permissions: adds "scripting", used together with activeTab on the click only, to read the page's visible text for the move list. No host permissions, nothing persistent, nothing leaves the device.

Board reading (screenshot → position) is unchanged.