fix(web): auto-complete now works with cards remaining in waste

check_auto_complete no longer requires the waste pile to be empty —
only the stock must be exhausted and all tableau cards face-up.
next_auto_complete_move checks the waste top card before scanning
tableau, and auto_complete_step falls back to draw() when no direct
foundation move is available so the waste drains automatically.

Fixes the end-game state where the player could see a clear win but
the auto-complete interval never fired because the waste was non-empty.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

solitaire_server/web/pkg/solitaire_wasm.js

@@ -1,3 +1,5 @@
+/* @ts-self-types="./solitaire_wasm.d.ts" */
+
 /**
  * Browser-side replay state machine. Owns a live `GameState` and the
  * replay's move list; each `step()` applies the next move.
@@ -92,7 +94,10 @@ export class SolitaireGame {
     }
     /**
      * Apply one auto-complete move (only valid when `is_auto_completable`).
-     * Returns the post-move snapshot or `null` when auto-complete is unavailable.
+     *
+     * If no card can go directly to a foundation this step, advances the
+     * waste by calling `draw()` so the next step can try again. Returns the
+     * post-move snapshot, or `null` when no progress is possible.
      * @returns {any}
      */
     auto_complete_step() {