chore: CI simulator bump and project housekeeping

[frederikprijck]

Summary

Extracts unrelated maintenance from the passkeys PR (#858).

• Bump CI iOS simulator iPhone 16 → iPhone 17 (.github/workflows/main.yml)
• Ignore Swift Package Manager build caches .build/ and .swiftpm/ (ios/macos/darwin .gitignore)
• Pick up Flutter-generated xcscheme debug settings (LLDB init file, GPU validation)
• Minor example_app.dart cleanup (RegExp literal + SSO idToken display)

Context

These changes were bundled into #858 (passkeys) but are independent, low-risk maintenance unrelated to the passkeys feature.

Test plan

• CI passes on iPhone 17 simulator
• Example app builds on iOS/macOS

Summary by CodeRabbit

• Chores
  • Updated iOS simulator configuration in CI pipeline
  • Enhanced build cache handling for platform-specific workflows

[coderabbitai]

Walkthrough

The PR updates the CI workflow to target iPhone 17 for iOS simulator tests and adds Swift Package Manager build cache directories (.build/ and .swiftpm/) to gitignore files across the darwin, ios, and macos platform directories to prevent build artifacts from being tracked in version control.

Changes

Build & CI Setup Updates

Layer / File(s)	Summary
iOS simulator version update .github/workflows/main.yml	CI workflow environment variable ios-simulator updated from iPhone 16 to iPhone 17 to use the current simulator target for iOS test jobs.
SPM build cache exclusions auth0_flutter/darwin/.gitignore, auth0_flutter/ios/.gitignore, auth0_flutter/macos/.gitignore	Swift Package Manager build cache directories .build/ and .swiftpm/ added to gitignore across all three platform directories with a descriptive comment.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

📱 iPhone seventeen takes the stage,
Swift caches hidden from the page,
Build artifacts fade from sight,
Clean workflows, tested right! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: CI simulator bump and project housekeeping' accurately summarizes the main changes: iOS simulator version bump and gitignore updates for SPM build cache.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/ci-and-housekeeping

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