Split WebViewController functionality into multiple extension files
(Alerts, EmptyState, Gestures, Navigation, Onboarding, Settings,
StatusBar, URLLoading, WebViewSetup) and add FrontEndConnectionState
enum. Update Xcode project to include the new source files and adjust
several Database test file references and a local Swift package path
(Sources/SharedPush). Also add empty input/output path arrays to several
CocoaPods embed phases. This refactors web view features into modular
components and wires them into the project file.
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