World generation (WorldScene.OnLoad: terrain, atlases, spawn) runs synchronously
and blocks the frame; previously only a blank fade covered it, with no feedback.
New WorldLoadingScene shows a "Generating world" label, lets it draw, then switches
to WorldScene WITHOUT a transition so its last drawn frame (the label) stays on
screen during the blocking generation. Both New World and Load Game route through
it. Localized loading.world ru/en. Build + --check-content clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Leonid PershinandClaude Opus 4.8
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