Add runners, nimby lock, and mac state fixes

[treeform]

Summary

• add tests/run_all.nim and tests/run_all_emscripten.nim to compile-first and then run/open examples
• migrate CI to a silky-style flow: native checks first, then Ubuntu-only Emscripten phase, and switch dependency setup to nimby sync -g nimby.lock
• fix macOS fullscreen/minimized behavior by correcting the fullscreen selector and tracking async state through NSWindow delegate callbacks
• refactor examples/property_changes.nim waits with a reusable waitFor helper for async transitions

Test plan

• nimby sync -g nimby.lock
• nim c tests/test.nim
• nim check tests/run_all.nim
• nim check tests/run_all_emscripten.nim
• nim check src/windy/platforms/macos/platform.nim
• nim r examples/property_changes.nim

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