[Native Checkout] CTAs polish

[cdolm92]

📲 What

This PR addresses the following:

• Changing the label on the thanks screen to a button
• CTAs are now aligned vertically when the device is in portrait mode
• CTAs are now aligned horizontally when the device is in landscape mode
• Add highlight states to checkout buttons using the checkout style buttons

🤔 Why

Closing out small visual issues found during the consolidation of Checkout button styles throughout the rest of the app.

👀 See

See snapshots below.

Thanks Screen Before 🐛	Thanks Screen After 🦋

CTA Portrait	CTA Vertical

Manage Highlight	Back this project

Fix Highlight	View pledge Highlight

♿️ Accessibility

• Tap targets use minimum of 44x44 pts dimensions
• Works with VoiceOver
• Supports Dynamic Type

✅ Acceptance criteria

• To See Thanks Screen On the Explore screen tap on a project and back it. Scroll down to view the See All [CATEGORY] projects button.
• Test CTAs in View Pledge Screen Navigate to your profile and tap on a non-live project in the backed section. If the device is in portrait mode CTAs should be vertical, if on landscape CTAs should be horizontal. Rotate device, check for CTAs to be aligned correctly.\
• Highlight states Navigate to project screen. tap down on the CTA button. Compare button color to designs.

⏰ TODO

• self-review
• Will add screenshots
• CTAs in View Pledge screen should be next to each other in landscape

[justinswart]

Looking good! Just the one suggestion really.

[justinswart]

I think instead of inspecting the orientation we actually want to check the UITraitCollection's sizeClass.

So this would be horizontalSizeClass == .regular and for this we would have an input for traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?).

[justinswart]

Nice!