Safer Skyblock loading and livelier lobby guides

Skyblock entry now lands players safely on their island, every lobby guide shows the mode's live activity, and compact champion heads return.

• Skyblock entry and rejoin now place players directly on safe solid ground, preventing illegal-flight disconnects on slower clients.
• Every game guide in the main lobby now shows the total number of online players currently active in that mode.
• Counts include players across every open or running arena instead of only one preferred match.
• Skyblock reports its persistent active sessions through the same compact guide label.
• Where ranking data exists, one best-player head returns beside the game guide, while the large weekly ranking panels stay disabled to keep the spawn open and readable.
• The changes are available to Java and Bedrock players.