Amogh/Fix macOS foreground issue: activate app on launch to remove 'Failed

[Amoghhosamane]

Description

This PR enables automatic code‑signing for the iOS Debug build configuration, allowing developers to run the app on physical iOS devices (iOS > 14) without manual provisioning profile setup.

• Replaces the PROVISIONING_PROFILE_SPECIFIER line with CODE_SIGN_STYLE = Automatic.
• Leaves the existing CODE_SIGN_ENTITLEMENTS, DEVELOPMENT_TEAM, and other settings untouched, preserving the manual signing flow for Release builds.

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Related Issues

• Fixes IOS: fixes auto signing for IOS physical device testing #342 – “IOS: fixes auto signing for IOS physical device testing”.

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Type of Change

• Bug fix (non‑breaking change that resolves signing errors for dev testing).

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How To Test?

1. Check out the branch fix/ios-auto-signing-debug.

2. Run the iOS debug build:

   flutter run --debug -d ios

3. Connect a physical iOS device (iOS > 14).

4. Verify that Xcode/Flutter automatically selects a development certificate and provisioning profile, and the app installs and launches without signing errors.

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Checklist

• Screenshots included here/in linked issue IOS: fixes auto signing for IOS physical device testing #342 (show Xcode auto‑sign status).
• Changes adhere to the style and coding guidelines.
• Self‑review performed.
• Code comments added where the signing line was changed.
• No documentation changes required (signing behavior is implicit).
• No dependent changes required.
• No lint errors (flutter analyze lib).
• Integration test: run flutter test (all existing tests pass).
• Tested on devices: iOS (physical device).
• Reviewers identified (please assign).
• PR approved by reviewers.

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Finalising

• Merge dev into this branch (if any new changes appeared).

• Resolve any conflicts.

• Add a one‑line entry to CHANGELOG.md:

  - Enabled automatic signing for iOS Debug builds to simplify physical device testing.

• Push to the repository and create the PR.

• Merge the PR into dev.