feat: Convert commons module to Kotlin Multiplatform
- Rewrite build.gradle.kts for KMP with Android + JVM targets
- Restructure source sets: commonMain, jvmAndroid, androidMain, jvmMain
- Replace android.util.LruCache with androidx.collection.LruCache (KMP-ready)
- Replace android.util.Patterns with local regex constants
- Move shared code to commonMain (icons, hashtags, robohash, compose, etc.)
- Move JVM-shared code to jvmAndroid (richtext, base64Image detection)
- Keep Android-specific code in androidMain (blurhash, bitmap handling)
- Remove @Preview annotations from shared code (Android-only feature)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
nrobi144
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