feat: add app_level_token_rotation_enabled setting to app manifest

[zimeg]

Changelog

Add support for the settings.app_level_token_rotation_enabled: <bool> manifest property to opt in to rotating app-level tokens.

Summary

This pull request adds the settings.app_level_token_rotation_enabled boolean field to the AppSettings manifest type.

• Apps that opt in get rotating app-level tokens (xoxe.xapp-) that expire after 12 hours and come with a single-use refresh token
• Adds the field to the typed manifest so it's handled like the other boolean settings, such as token_rotation_enabled

Preview

N/A

Testing

# Create a new app
$ slack create

# Update the manifest.json with `settings.app_level_token_rotation_enabled: true`
$ vim manifest.json

# Install the app
$ slack install

# Confirm rotation is enabled
$ slack app settings
# → Select "Basic Information" and scroll to "App-Level Tokens"
# → Confirm token rotation is enabled

Notes

Follows the existing *bool + omitempty pattern used by token_rotation_enabled and is_mcp_enabled (#513). gofmt realigned the AppSettings struct tags since the new field name is the longest.

Companion schema change: slackapi/manifest-schema#90.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.22%. Comparing base (20dd730) to head (1c0c562).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #682      +/-   ##
==========================================
- Coverage   78.23%   78.22%   -0.01%     
==========================================
  Files         239      239              
  Lines       18149    18149              
==========================================
- Hits        14198    14197       -1     
- Misses       3951     3952       +1     

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[mwbrooks]

✅ Thanks for getting ahead of this one! 🙇🏻