Add Apple Silicon macOS support

[mirashif]

No description provided.

[omarchybot]

Reviewed this from the Linux side, since that is the platform anyone here can actually test. Short version: the Linux build, the tests and every documented Linux shortcut survive intact, and the two things worth flagging are small.

Verified on a clean Arch box with Qt 6.11.1:

• ./bin/test passes — 13 tests, including the new detectsSystemAppearanceWithoutRequiringAPortal. ./bin/build still produces build/omawrite, so the literal install -Dm755 build/omawrite in pkgbuild/PKGBUILD is unaffected by the new VERSION = 0.1.0.
• The brew branches in bin/build and bin/test never run on Linux. I put a brew on PATH that touches a marker file and rebuilt; the marker was never created, because elif stops at qmake6 and the later conditions — including the $(brew --prefix qtbase) substitution — are never evaluated.
• JOBS cannot come out empty: on Linux sysctl -n hw.logicalcpu exits 1 and prints nothing to stdout, so || echo 1 wins and make -j never runs unbounded.
• linux: QT += dbus matches on Arch — the link line pulls in libQt6DBus.so — and moc still sees Q_OS_LINUX through qmake's moc_predefs.h, so handlePortalSettingChanged is present in the generated meta-object and the portal SettingChanged connection still binds. Live theme and text-size changes keep working.
• The StandardKey conversions keep every binding the README documents. QKeySequence::keyBindings(QKeySequence::Redo) on Qt 6.11.1 is Ctrl+Y | Alt+Shift+Backspace | Ctrl+Shift+Z | Redo under every keyboard scheme I tried, and sequences: grabs all of them, so Ctrl+Y still redoes. Side effect worth knowing about: StandardKey.Undo and StandardKey.Redo also bind Alt+Backspace and Alt+Shift+Backspace now.

Two things for you:

1. src/Main.qml:361 — Shortcut.nativeText returns only the first entry of sequences, so the fullscreen row of the Ctrl+? dialog now reads Meta+F Fullscreen where it used to read F11 / Super+F Fullscreen. F11 still works, it is just no longer discoverable from the dialog, and Meta is not what an Omarchy user calls that key. Left it alone rather than picking a wording for you, but that row wants spelling out on the Linux branch.

2. pkgbuild/Info.plist replaces Qt's generated plist wholesale and drops NSPrincipalClass (NSApplication), which Qt's own mkspecs/macx-clang/Info.plist.app template sets. No Mac here to check on, so this is a question rather than a claim: did you confirm the bundle activates and gets its menu bar without it? The same file hardcodes 0.1.0 where @SHORT_VERSION@ would track VERSION in omawrite.pro, so the two will drift at the next release.

One scheduling note: PRs #14, #15, #17 and #18 all touch src/Main.qml, and #15 and #17 add rows to the same shortcuts dialog this rewrites — whichever lands second will need a rebase.