fix(eid-wallet): strip alpha channel from iOS app icons

[coodos]

Apple rejected the build with "invalid large app icon, can't contain alpha channel".

All 18 icons in the iOS AppIcon.appiconset carried an unused alpha channel (the 1024x1024 marketing icon AppIcon-512@2x.png is the one App Store Connect flags). The icons were already visually opaque (white-backed), so flattening to opaque sRGB removes the channel without changing appearance.

Dimensions and colorspace unchanged.

Note: the Tauri source icons/icon.png still has a transparent background, so re-running tauri icon will reintroduce alpha on the iOS set. A follow-up could flatten the master or add a post-generation step, but that touches Android/macOS/Windows output too, so it's left out here.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5501618a-5168-4628-92ee-757507e1d629

📥 Commits

Reviewing files that changed from the base of the PR and between 0cbf149 and adf57de.

⛔ Files ignored due to path filters (20)

• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-20x20@1x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-20x20@2x-1.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-20x20@2x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-20x20@3x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-29x29@1x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-29x29@2x-1.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-29x29@2x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-29x29@3x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-40x40@1x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-40x40@2x-1.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-40x40@2x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-40x40@3x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-512@2x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-60x60@2x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-60x60@3x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-76x76@1x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-76x76@2x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/src-tauri/gen/apple/Assets.xcassets/AppIcon.appiconset/AppIcon-83.5x83.5@2x.png is excluded by !**/*.png, !**/gen/**
• infrastructure/eid-wallet/static/images/binding-documents.png is excluded by !**/*.png
• infrastructure/eid-wallet/static/images/what-is-evault.png is excluded by !**/*.png

📒 Files selected for processing (1)

• infrastructure/eid-wallet/src-tauri/tauri.conf.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ios-icon-alpha

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