Add 'Connect Existing App' flow to BundleIDSetupView

[PaulMest]

Summary

• Adds a "Connect Existing App" option to BundleIDSetupView so users can link their project to an existing App Store Connect listing instead of registering a new bundle ID
• Fetches all apps via fetchAllApps(), displays them in a searchable list, and saves the selected app's bundle ID to project metadata
• Reuses the existing fetchApp → resetTabState → fetchTabData completion path

Test plan

• Open a project with no linked ASC app — verify "Already have an app? Connect Existing App →" link appears on the setup screen
• Click the link — verify apps load from the account and display in a searchable list
• Type in the search field — verify the list filters by name and bundle ID
• Select an app — verify it saves the bundle ID and loads the ASC tab data
• Click "Need a new app? Register Bundle ID →" — verify it navigates back to the registration form

🤖 Generated with Claude Code

[PaulMest]

I pretty heavily use Claude Code and am not a native Swift developer. But I've tested this out and it worked for me. I'm open to feedback. Should be able to get it resolved within 1-2 nights.

Updates

Overview Screen

• New TLD option (default to com)
• Ability to Connect Existing App

Connect Existing Apps