Add Nix flake for native Apple Silicon dev builds - #965
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Provides a devShell with Qt 6 built natively for aarch64-darwin, plus a dev-run.sh script that builds via qmake/make and finalizes the .app bundle (embedded qt.conf + merged QML plugin dir) so it can also be launched by double-clicking in Finder, without needing Qt installed system-wide or a wrapper script at launch time.
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Summary
flake.nix/flake.lockproviding anix developshell with Qt 6 built natively foraarch64-darwin(and other systems), so contributors on Apple Silicon can get a working native (non-Rosetta) toolchain without Homebrew or the Qt installer.scripts/dev-run.sh, which builds the project with that toolchain and finalizes the resulting.appbundle (embeds aqt.confpointing at the Nix Qt plugin/QML paths, and merges in theqmltermwidgetplugin) so the built app can also be launched by double-clicking in Finder afterwards, without needing the script or any env vars at launch time.This is purely additive (new files only) and doesn't touch the existing qmake/CI build path.
Test plan
nix developprovidesqmakeresolving to a nativearm64Qt 6 (verified vialipo -info)./scripts/dev-run.shbuilds and runs the app.applaunches successfully viaopen cool-retro-term.app(Finder double-click equivalent) with a clean environment