Convert keyboard app About tab to SwiftUI (#608)

[prince-0408]

Summary

Converts the About tab of the Scribe keyboard app from UIKit to SwiftUI, following the pattern established in #607 for the Conjugate app.

Closes #608

Changes

New SwiftUI Files

File	Description
AboutTab.swift	Main view with Community, Feedback and support, and Legal sections
AboutRowView.swift	Reusable row with icon, title, and trailing indicator
AboutSectionView.swift	Grouped section container with heading
AboutTipCardView.swift	Dismissible tip card shown at the top of the tab
AboutInfoView.swift	Detail screens for Wikimedia, Privacy policy, and Third-party licenses
ShareSheet.swift	UIKit bridge for system share sheet and mail compose view

Modified Files

File	Change
AppScreen.storyboard	About scene now uses AboutHostingController (a UIHostingController subclass) instead of AboutViewController — InformationScreenVC scene fully removed
project.pbxproj	AboutViewController.swift and InformationScreenVC.swift removed, AboutHostingController.swift registered

Deleted Files

File	Reason
AboutViewController.swift	Replaced by AboutHostingController — a minimal UIHostingController<AnyView> subclass
InformationScreenVC.swift	Fully removed — navigation to info screens handled via SwiftUI NavigationLink
AboutTableData.swift	Replaced by inline data in AboutTab.swift

Notes

• The tab content is pure SwiftUI. AboutHostingController is the only remaining UIKit code — it is a necessary bridge since the app's root is a UITabBarController wired via storyboard. This cannot be removed until the Installation and Settings tabs are also migrated to SwiftUI, at which point the storyboard and AppDelegate can be replaced with a SwiftUI App entry point
• Email uses MFMailComposeViewController via UIViewControllerRepresentable with a fallback alert for devices that can't send mail
• Reset app hints resets all three tip card states: installationTipCardState, settingsTipCardState, aboutTipCardState
• All URLs and GitHub links point to scribe-org/Scribe-iOS

Update

Updated based on feedback from @andrewtavis — removed all UIKit related code (AboutViewController and InformationScreenVC) entirely. Replaced with a minimal AboutHostingController (UIHostingController subclass) as the only remaining bridge, which is necessary since the app root is still a UITabBarController wired via storyboard. This can be fully removed once Installation and Settings tabs are also migrated to SwiftUI.

Screenshots

[github-actions]

Thank you for the pull request! 💙🩵

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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• Tests for changes have been written and the CI unit test, linting and formatting workflows within the PR checks do not indicate new errors in the files changed

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)