Say Not supported only for a Mac model the installer refuses

[joshuaswarren]

The header says Not supported only when the installer refuses the Mac model.

What happened

On a 14-inch M2 Max (apple,j414c, status: enabled in the signed edge catalog) installer 2.0.10 showed APPLE M2 MAX · 426 GB FREE · NOT SUPPORTED · EDGE above "Omarchy is already installed". The only problem was an older install still on the disk. After Remove Omarchy, the same Mac showed SUPPORTED.

On main the header still badges every .existingInstallRefused and every .unsupported page as Not supported. That includes too little space and a Mac the installer couldn't inspect.

Change

• InstallerSession.modelSupported decides the badge. It is false only for a refused model (isBlockedModel: blocked, or missing from the catalog). An existing install or a space shortfall on a supported Mac gives true. A stop where the installer couldn't tell gives nil, and the header shows no support badge.
• OnePageInstallerView renders that value. Its private isBlocked is removed.

Tests

testHeaderSaysNotSupportedOnlyForARefusedModel checks 7 cases. With the old rule moved into the session unchanged, 4 fail: existing install on a supported Mac, existing install where the engine couldn't tell, too little space, and not ready. With this change all 7 pass.

Run on an M1 Ultra Mac Studio (Mac13,2), macOS 26.6.2, Xcode 27.0, Swift 6.4:

• xcrun swift-format lint --strict --recursive Package.swift Sources Tests: clean
• swift test: 148 + 3 + 519 + 8 tests, 0 failures (1 existing skip)
• swift test -c release: 137 + 3 + 519 + 5 tests, 0 failures
• ./test/all on Linux: passed

I didn't capture a screenshot of the new header on a Mac with an existing install.

[scottjones]

Reviewed and verified locally on macOS: swift-format lint --strict is clean, and all 59 InstallerSessionTests pass, including testHeaderSaysNotSupportedOnlyForARefusedModel. It also matches what I saw on an M3 Air: Not supported over an existing install, then Supported after removing it. Thanks!