Improve connection empty state UI

[bgoncal]

Summary

Screenshots

Link to pull request in Documentation repository

Documentation: home-assistant/companion.home-assistant#

Any other notes

[Copilot]

Pull request overview

Updates the WebView connection empty-state UI to improve layout and structure, while refactoring related types into separate files for better organization.

Changes:

• Refactors WebViewEmptyStateStyle and the UIKit WebViewEmptyStateWrapperView into their own files.
• Reworks WebViewEmptyStateView layout to use safeAreaInset for header and bottom actions.
• Adds a dedicated previews file with multiple #Preview configurations.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Sources/App/Frontend/WebView/Views/WebViewEmptyStateWrapperView.swift	Extracted UIKit wrapper around the SwiftUI empty state view.
Sources/App/Frontend/WebView/Views/WebViewEmptyStateView.swift	Updated SwiftUI layout to reposition header/actions using safe-area insets and adjust styling.
Sources/App/Frontend/WebView/Views/WebViewEmptyStateView+Previews.swift	Added multiple SwiftUI previews for disconnected/unauthenticated/re-auth flows.
Sources/App/Frontend/WebView/Views/WebViewEmptyStateStyle.swift	Extracted empty-state style enum into its own file.
HomeAssistant.xcodeproj/project.pbxproj	Adds new files to the project; also includes additional unrelated project-file churn.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@7c852db). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff           @@
##             main   #4557   +/-   ##
======================================
  Coverage        ?       0           
======================================
  Files           ?       0           
  Lines           ?       0           
  Branches        ?       0           
======================================
  Hits            ?       0           
  Misses          ?       0           
  Partials        ?       0           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.