feat(entry): START GAME shows the wait-vs-drop-in choice for free games too

Previously the timing-choice modal (Start Now / Wait for Next Block) only appeared for
paid-credits players; free players got a silent immediate drop-in. Now it shows whenever
the game would start instantly:
- Server getGameModeInfo exposes freePlayEnabled (was server-only) so the client knows
  free play is available even on a paid instance.
- Client (inputHandler) gates the modal on free-play-available OR paid-credits-with-credits;
  the modal is purely a TIMING pick (auto_start vs join_queue) — payment method is unchanged.
- Modal cost text reflects free play.

Both waiting animations are untouched: they render on the ROT display via WaitingScreenAnimator
using the base GameTiles, independent of the render-kit packs (which are disabled for SP anyway),
so they work regardless of visualization style. Suite 62/435 green.

src/game/gameModeManager.js

@@ -1492,6 +1492,7 @@ class GameModeManager {
         
         return {
             mode: this.gameMode,
+            freePlayEnabled: !!this.freePlayEnabled, // players may choose free play even on a paid instance
             cryptoType: this.cryptoType,
             currencyLabel: this.currencyLabel, // sXMR on stagenet, XMR on mainnet, WOW for Wownero
             gameName: this.gameName,           // Monerogue / Wownerogue