fix(game): form book on non-matching draw

[folkengine]

fix(game): form book on non-matching drawhandle_draw only checked for a completed book when the drawn card matched the asked rank. A non-matching draw can still complete a book of the drawn card's rank, leaving the player stuck holding all four cards for the rest of the game. Fix by checking the drawn card's rank in both branches.

Summary

The defect is in gfcore, not gfarena. gfarena's src/lib.rs is just a WASM shim re-exporting gfcore::wasm_api.

Root cause: Game::handle_draw in src/game/state.rs only checked for a completed book when the drawn card matched the asked rank. A non-matching draw can
still complete a book of the drawn card's own rank (player held three of X, asked for Y, drew the fourth X).

Evidence in the recorded game: Player 0 ("You") held 4♦, 4♣ from the deal, picked up 4♥ from Lucky on turn 9, then on turn 17 asked Lucky for a 9 → Go Fish
→ drew 4♠ from the pile. All four 4s were in hand but books_after_turn stayed at [1,0,0,0], and P0 wasted turns 25 and 33 asking for 4s that no one else
could possibly have.

Fix: Capture the drawn card's rank and always pass it to check_and_collect_book regardless of matched. When matched is true and a book forms, the player
goes again (BookCompleted); when matched is false, the turn still advances (preserves the standard "no match ends turn" rule) but the book is recorded.

Files changed:

• src/game/state.rs — Game::handle_draw rewritten around the draw/book branch
• src/game/state.rs — added test_handle_draw_forms_book_on_non_matching_draw regression test next to the existing matched: false test