feat: add image helper functions, aboveLayerId, atIndex parameter

[josxha]

• addImages(Map<String, bytes>)
• addImageFromIconData()
• addImageFromAssets()
• aboveLayerId parameter
• atIndex parameter
• fix offline region check
• remove manual release of NSObjects (causes crashes)

[Copilot]

Pull Request Overview

This PR addresses memory management and a critical bug fix in the iOS platform implementation:

• Removes manual release() calls on FFI objects for automatic memory management
• Fixes an inverted condition in getOfflineRegion that prevented finding the correct region

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
lib/src/platform/ios/style_controller.dart	Removes manual release() calls on NSString and style layer/source objects in various methods (addLayer, addSource, removeImage, removeLayer, removeSource)
lib/src/platform/ios/offline_manager.dart	Fixes inverted logic from != to == when searching for offline region by ID

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.64%. Comparing base (05bfb44) to head (4f1011a).
⚠️ Report is 1 commits behind head on main.

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[Copilot]

Pull Request Overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

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[Copilot]

Pull Request Overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

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