Add frontend console logging support

[RAprogramm]

Summary

• add optional frontend feature with BrowserConsoleError/BrowserConsoleExt helpers
• support emitting AppError/ErrorResponse as JsValue and logging to console.error
• document the browser workflow and bump crate version to 0.4.0

Testing

• cargo build --all-targets
• cargo build --all-targets --features frontend
• cargo clippy --all-targets --features frontend -- -D warnings
• cargo test --all
• cargo test --all --features frontend
• cargo doc --no-deps --features frontend

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https://chatgpt.com/codex/tasks/task_e_68c93be351c8832b9fc2b064ffa60cac

[RAprogramm]

@codex
naidi vse Result<... , ...> i zameni na AppResult<...>
specialno dlya etogo alias est'

[chatgpt-codex-connector]

Summary

• Updated conversion module docs to demonstrate returning AppResult in examples instead of Result<_, AppError>, including the From<String> example snippet. src/convert.rsL49-L75 src/convert.rsL152-L163
• Clarified the Actix integration docs to reference AppResult<_> for handler returns. src/convert/actix.rsL1-L10
• Refreshed validator conversion docs to import and use AppResult in the sample code. src/convert/validator.rsL21-L38
• Reworded library and prelude documentation to describe the AppResult alias without explicit Result<T, AppError> generics. src/lib.rsL9-L15 src/prelude.rsL32-L41

Testing

• ⚠️ Not run (documentation-only changes)

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