The UI when analyzing should show when 50 the move rule is hit

[TBestLittleHelper]

The user story summarized.

User plays a game that ends from a threefold repetition. User makes a few moves in a variant to analyse the game, before the board becomes unclickable and they can't select anything (ie. a pawn). User takes the game to the analysis board ( ie https://lichess.org/analysis/standard/8/p4p2/1p2p1p1/r1k1P1Pp/P1P2P1P/R1K5/8/8_b_-_-_100_81 ) and there it's also impossible to make any moves.

Of course, the game has ended due to the 50 move rule in that position. But it's not shown anywhere in the UI for a game, nor in /analysis . Well, the move list will show the move number, but for example on mobile that move list might not be shown.

It's not really a unique story, but I did not find any duplicate issues so a fresh one it is.