Module top_level 

Top-level window creation runner (Phase H.6) reducer handlers. Extracted from reducer/mod.rs in task #182 PR-F-2 for navigability.

Functions

handle_enqueue_top_level_window 🔒

handle_top_level_callback_fired 🔒

handle_top_level_externally_closed 🔒

handle_top_level_renderer_terminated 🔒

push_top_level_history 🔒

start_next_top_level_if_idle 🔒

Internal helper: if in_flight is None and queue has work, pop the front and start it. Emits TopLevelCreationRequested, TopLevelCreationStarted, Effect::PostCreateWindow, and updated queue length.