[nighthawk]

Follow-up to #33.

Why

When an app pushes a TGCardViewController onto a navigation stack, iOS 27 showed its cards the classic way instead of in the system sheet, until something laid the view out again, e.g., rotating the device. viewDidAppear is called while the push transition is still under way, so the sheet can't be presented yet; the install fell back to the classic cards, and nothing retried.

Whether to use a sheet is a fixed decision (iOS 27+, floating mode, not inside another sheet). Only when the sheet can be presented varies, as it's a modal presentation. Falling back to the classic cards while waiting hid bugs like this one, and made "iOS 27 means sheets" untrue.

What

• While a transition is in the way, the sheet gets presented right after it completes.
• On iOS 27, the classic cards never show: while the sheet can't be presented yet, the cards stay hidden.
• presentationStyle and .classic are deprecated on iOS 27, as they no longer have an effect, so that they can be removed once iOS 27 is the minimum. The Example's -classicCards launch argument is gone.

Testing

1. On iOS 27, in an app that pushes a TGCardViewController onto a UINavigationController: the cards show in the sheet right after the push, without rotating. Pushing another screen over it and back shows the sheet again. (To try it with the Example, set the window's root to a navigation controller in SceneDelegate and push the storyboard's card controller.)
2. On iOS 27, the Example as is shows the sheet on launch.
3. On iOS 26, the Example shows the classic card as before.
4. In TripGo on iOS 27 with a fresh install, the map shows without a card behind the Terms of Use, and the sheet appears once they're accepted.

🤖 Generated with Claude Code

[nighthawk]

Suggested squash-merge commit message:

feat: always use system sheets on iOS 27, also when pushed

When the card controller got pushed onto a navigation stack, the sheet
couldn't be presented during the push transition, so the cards showed
the classic way until, e.g., the device got rotated. Now the sheet gets
presented right after the transition.

On iOS 27, the classic cards no longer show at all: until the sheet can
be presented, the cards stay hidden. `presentationStyle` and its
`.classic` option are deprecated on iOS 27, as they no longer have an
effect, so that they can be removed once iOS 27 is the minimum.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>