Fix nested member access and ImageResource pattern detection

[adamlaw-kraken]

Fixes incomplete detection of Xcode-generated asset symbols for:

1. Folder-organized assets (nested member access)
2. ImageResource dot notation references
3. Asset names containing dots

Problems Fixed:

1. Nested Member Access (Issue Add check unuse for Xcode generated asset symbols #83 follow-up) PR Handle generated asset symbols via member access scanning #84 added support for simple patterns like .icFlag, but didn't handle nested patterns like Image(.Icons.Settings.logo) that Xcode generates for folder-structured asset catalogs.

2. ImageResource Pattern ImageResource.homeIcon and ImageResource.Icons.Settings.logo patterns were not detected at all.

3. Dots in Asset Names Asset names like "empty.icon" or "navigation-menu.row.icon" were incorrectly converted to .empty.icon instead of .emptyIcon. The generatedAssetSymbolKey function didn't treat dots as word boundaries like Xcode does.

Solution:

1. Added regex pattern for nested member access inside Image() calls
2. Added regex pattern for ImageResource dot notation
3. Track ranges to exclude nested patterns from simple matching
4. Updated suffix matching logic for namespaced symbols
5. Fixed generatedAssetSymbolKey to treat dots as word boundaries
6. Added comprehensive tests for all patterns

Testing:

• New tests cover: deeply nested patterns (4+ levels), ImageResource notation, whitespace handling, dots in filenames, and mixed usage
• Verified on real iOS project with folder-organized assets

Impact:
This fix makes FengNiao work correctly with modern Xcode projects that organize assets in folders and use type-safe asset symbols.