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.

html/js/input/inputHandler.js

@@ -201,20 +201,22 @@ const InputHandler = {
     setupClickHandlers: function() {
         // Add click handling for the HTML START button
         $('#startButton').click(function(e) {
-            // If early entry is available and user has credits, show choice modal
+            // Show the wait-vs-drop-in TIMING choice whenever the game would start instantly (no
+            // upfront payment): free play (this instance allows it), a FREE instance, or paid-credits
+            // with credits in hand. The chosen payment method flows through auto_start / join_queue
+            // unchanged — this modal only picks WHEN you enter.
             if (typeof SocketHandlers !== 'undefined') {
-                var isPaidCredits = SocketHandlers._gameMode === 'PAID_CREDITS';
+                var mode = SocketHandlers._gameMode;
+                var freeAvailable = SocketHandlers._freePlayEnabled || mode === 'FREE';
                 var hasCredits = SocketHandlers._creditsBalance >= (SocketHandlers._creditsPerGame || 1);
-                var earlyAllowed = SocketHandlers._earlyEntryConfig &&
-                    SocketHandlers._earlyEntryConfig.enabled &&
-                    SocketHandlers._earlyEntryConfig.allowInCreditsMode;
-                if (isPaidCredits && hasCredits && earlyAllowed) {
-                    SocketHandlers.showEntryChoiceModal();
+                var instantStart = freeAvailable || (mode === 'PAID_CREDITS' && hasCredits);
+                if (instantStart) {
+                    SocketHandlers.showEntryChoiceModal({ freeAvailable: freeAvailable, hasCredits: hasCredits });
                     return;
                 }
             }
 
-            // Default: attempt immediate start
+            // Default: attempt immediate start (payment-required modes go through their own flow)
             socket.emit('auto_start');
 
             // Check if we should show waiting screen

html/js/network/socketHandlers.js

@@ -708,6 +708,7 @@ const SocketHandlers = {
         
         // Store game mode and early entry config
         SocketHandlers._gameMode = data.mode;
+        SocketHandlers._freePlayEnabled = !!data.freePlayEnabled;
         SocketHandlers._earlyEntryConfig = data.earlyEntry || { enabled: false };
         SocketHandlers._creditsPayoutsEnabled = !!data.creditsPayoutsEnabled;
         SocketHandlers._directPayoutsEnabled = !!data.directPayoutsEnabled;
@@ -1693,11 +1694,15 @@ const SocketHandlers = {
     // Entry Choice Modal
     // =====================
 
-    showEntryChoiceModal: function() {
+    showEntryChoiceModal: function(opts) {
+        opts = opts || {};
         // Remove any existing modal
         $('#entryChoiceOverlay').remove();
 
         var cost = this._creditsPerGame || 1;
+        var costText = opts.freeAvailable
+            ? 'Free play — no credits needed'
+            : ('Cost: ' + cost + ' credit per game');
         var $overlay = $('<div id="entryChoiceOverlay">').css({
             position: 'fixed', top: 0, left: 0, width: '100%', height: '100%',
             background: 'rgba(0,0,0,0.7)', zIndex: 3000,
@@ -1712,7 +1717,7 @@ const SocketHandlers = {
 
         $modal.html(
             '<div style="font-size:18px; font-weight:bold; margin-bottom:16px;">How do you want to enter?</div>' +
-            '<div style="font-size:12px; color:#888; margin-bottom:20px;">Cost: ' + cost + ' credit per game</div>' +
+            '<div style="font-size:12px; color:#888; margin-bottom:20px;">' + costText + '</div>' +
             '<button id="entryChoiceNow" style="' +
                 'display:block; width:100%; padding:12px; margin-bottom:10px; cursor:pointer; ' +
                 'background:linear-gradient(180deg,#662200,#441100); border:2px solid #ff6600; ' +

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