Downgrade Availability to iOS 16

[Lakr233]

This pull request improves compatibility with iOS 16, updates calendar and microphone permission handling for different iOS versions, and enhances the user interface to better reflect iCloud sync availability depending on the OS version. It also contains minor updates to build scripts and the app version.

iOS Compatibility and iCloud Sync Availability:

• Lowered the minimum deployment target from iOS 17.0 to iOS 16.0 in the project settings, making the app available for more users. [1] [2]
• Updated all iCloud sync-related UI and logic (including settings and sync actions) to check if iCloud sync is supported on the current OS version, showing appropriate messages or disabling controls when unavailable. [1] [2] [3] [4] [5]

Permission Handling Improvements:

• Updated calendar access requests to use the correct API for each iOS version: requestFullAccessToEvents for iOS 17+ and requestAccess(to:) for earlier versions, ensuring compatibility and proper permission prompts. [1] [2] [3] [4] [5]
• Improved microphone permission handling in SimpleSpeechController to use AVAudioApplication for iOS 17+ and fall back to AVAudioSession for earlier versions.

Build and Versioning:

• Updated the app's marketing version to 4.4.6.
• Minor improvements to build scripts, ensuring directory paths are quoted and more robust. [1] [2]

UI/UX Improvements:

• Updated the iCloud sync feature description in the welcome screen to indicate it requires iOS 17+.
• Ensured that trait change registration for dark/light mode is only used on iOS 17+ to prevent crashes on earlier versions.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	flowdown-landing	9bbc1f4	Commit Preview URL Branch Preview URL	Jan 04 2026, 05:34 AM

[Copilot]

Pull request overview

This pull request lowers the iOS deployment target from iOS 17 to iOS 16, enhancing app availability while maintaining backward compatibility. The key changes include adding version checks for iOS 17+ specific APIs, conditionally enabling iCloud sync features based on OS version support, and updating permission request methods for calendar and microphone access to use appropriate APIs for each iOS version.

Key Changes:

• Downgraded iOS deployment target from 17.0 to 16.0 across project configurations and Swift packages
• Added version-specific checks for iCloud sync functionality, which requires iOS 17+
• Updated calendar and microphone permission request methods to use version-appropriate APIs

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
Resources/DevKit/scripts/i18n_tools.py	Updated type hints for Python 3.8 compatibility
Frameworks/Storage/Sources/Storage/Sync/SyncEngine.swift	Added iOS 17+ availability checks for sync engine initialization and operations
Frameworks/Storage/Sources/Storage/Sync/Internal/*.swift	Added macCatalyst 17 availability annotations to sync protocols and implementations
FlowDown/Resources/Localizable.xcstrings	Added localized strings for iOS version unavailability messages
FlowDown/Interface/SettingController/DataControl/*.swift	Conditionally display sync controls based on iOS version support
FlowDown/Interface/RichEditor/Supplement/BlockButton.swift	Guarded trait change registration with iOS 17+ check
FlowDown/Interface/RichEditor/SimpleSpeech/*.swift	Updated microphone permission requests for version compatibility
FlowDown/Backend/ModelTools/CalendarTools/*.swift	Updated calendar permission requests to use appropriate APIs per iOS version
FlowDown/Configuration/Version.xcconfig	Bumped marketing version to 4.4.6
FlowDown.xcodeproj/project.pbxproj	Changed IPHONEOS_DEPLOYMENT_TARGET from 17.0 to 16.0

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