Replace Kotlin doc references with Java

[MihaiCristianCondrea]

Summary

• update style guidance and screen docs to remove Kotlin language references
• rewrite core architecture docs with Java examples and view-based components
• convert SOLID principles and data layer guides to Java code snippets
• remove ScreenViewModel references and align core/data layer docs with existing code

Testing

• ./gradlew test (fails: SDK location not found)

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https://chatgpt.com/codex/tasks/task_e_68c5eca7cbf4832da9eea2822fb2126c