feat: add Candy Cannon Survival game mode with collectible tiles

Version bump to 2.3.6. New game mode features 20×20 arena with central cannon obstacle, three escalating phases (Open Arena, Route Pressure, Survival), and collectible tiles (Hearts, Diamonds, Stars, Coins) with pattern-matching missions. Players dodge candy volleys while completing collection goals.

Updated export paths and version strings across all platforms (Windows, Android, Web, Linux).

scripts/managers/lobby_manager.gd

@@ -80,7 +80,7 @@ var rematch_votes: Array = [] # [player_id, ...]
 # Character and area selection
 var available_characters: Array[String] = ["Copper", "Dabro", "Gatot", "Pip", "Random"]
 var available_areas: Array[String] = []
-var available_game_modes: Array[String] = ["Freemode", "Stop n Go"]
+var available_game_modes: Array[String] = ["Freemode", "Stop n Go", "Candy Cannon Survival"]
 var selected_area: String = "Freemode Arena" # Host-controlled
 var game_mode: String = "Freemode" # Host-controlled
 var local_character_index: int = 0 # Local player's character index
@@ -135,6 +135,8 @@ func _update_available_areas(mode: String) -> void:
 			available_areas = ["Freemode Arena", "Classic", "Colloseum"]
 		"Stop n Go":
 			available_areas = ["Stop N Go Arena"]
+		"Candy Cannon Survival":
+			available_areas = ["Gauntlet Arena"]
 		_:
 			available_areas = ["Classic"]