feat(ui): add ImageCacheService, ImageLoader control, and Avalonia XAML converters

[undead2146]

Summary

Adds an asynchronous two-tier (memory LRU and persistent disk) image caching service, custom ImageLoader Avalonia control, and a full suite of XAML value converters for UI bindings.

Note

This is a self-contained infrastructure PR carved out of #265 and must be merged ahead of #265.

Changes

• Image Caching: Implemented ImageCacheService with SHA-256 disk key hashing, async file streaming, eviction policy, and memory cache layer.
• Controls: Added ImageLoader Avalonia control for responsive, non-blocking image loading with fallback placeholders and error handling.
• XAML Converters: Added 10 reusable value converters under GenHub/Infrastructure/Converters/:
  • StringToImageConverter
  • StripHtmlConverter
  • BoolToBackgroundConverter
  • BoolToBorderConverter
  • ContentStateToBrushConverter
  • ContentStateToPathDataConverter
  • ContentStateToTextConverter
  • GameTypeInitialConverter
  • IndentToMarginConverter
  • NotEqualToConverter & ComparisonConverters
• Tests: Added complete unit tests in ImageCacheServiceTests.cs, StripHtmlConverterTests.cs, and StringToImageConverterTests.cs.

Verification

• All 1,691 test suites passing on Windows, Linux, and macOS.
• Pre-tested on fork in PR feat(ui): add ImageCacheService, ImageLoader control, and Avalonia XAML converters undead2146/GenHub#23.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 60119e3f-f502-42f4-84d4-5b9e4cfcff27

📥 Commits

Reviewing files that changed from the base of the PR and between 371741c and ba45729.

📒 Files selected for processing (23)

• GenHub/GenHub.Core/Constants/ImageCacheConstants.cs
• GenHub/GenHub.Core/Constants/UiConstants.cs
• GenHub/GenHub.Core/Helpers/HtmlTextHelper.cs
• GenHub/GenHub.Core/Models/Enums/ContentState.cs
• GenHub/GenHub.Tests/GenHub.Tests.Core/Converters/StripHtmlConverterTests.cs
• GenHub/GenHub.Tests/GenHub.Tests.Core/Helpers/HtmlTextHelperTests.cs
• GenHub/GenHub.Tests/GenHub.Tests.Core/Infrastructure/ApplicationDataPathConventionTests.cs
• GenHub/GenHub.Tests/GenHub.Tests.Core/Infrastructure/Converters/StringToImageConverterTests.cs
• GenHub/GenHub.Tests/GenHub.Tests.Core/Infrastructure/Services/ImageCacheServiceTests.cs
• GenHub/GenHub/Infrastructure/Controls/ImageLoader.cs
• GenHub/GenHub/Infrastructure/Converters/BoolToBackgroundConverter.cs
• GenHub/GenHub/Infrastructure/Converters/BoolToBorderConverter.cs
• GenHub/GenHub/Infrastructure/Converters/ComparisonConverters.cs
• GenHub/GenHub/Infrastructure/Converters/ContentStateToBrushConverter.cs
• GenHub/GenHub/Infrastructure/Converters/ContentStateToPathDataConverter.cs
• GenHub/GenHub/Infrastructure/Converters/ContentStateToTextConverter.cs
• GenHub/GenHub/Infrastructure/Converters/GameTypeInitialConverter.cs
• GenHub/GenHub/Infrastructure/Converters/IndentToMarginConverter.cs
• GenHub/GenHub/Infrastructure/Converters/NotEqualToConverter.cs
• GenHub/GenHub/Infrastructure/Converters/StringToImageConverter.cs
• GenHub/GenHub/Infrastructure/Converters/StripHtmlConverter.cs
• GenHub/GenHub/Infrastructure/Services/ImageCacheService.cs
• scripts/build-check.ps1

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[deepsource-io]

DeepSource Code Review

We reviewed changes in 371741c...ba45729 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
C#		Aug 20, 2026 9:36p.m.	Review ↗
JavaScript		Aug 20, 2026 9:36p.m.	Review ↗
Shell		Aug 20, 2026 9:36p.m.	Review ↗
Secrets		Aug 20, 2026 9:36p.m.	Review ↗

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