refactor: test helper function and test separation

[mors119]

Summary

test helper function and test separation.

Type of Change

• feat
• fix
• docs
• refactor
• test
• chore

Required

• cargo check passes
• cargo fmt --all --check passes
• cargo clippy --workspace --all-targets -- -D warnings passes
• cargo test passes

Checklist

• Code builds successfully
• Tests pass
• Documentation updated

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a63ba433-3a18-4ce8-b2dd-28693ba5c3cf

📥 Commits

Reviewing files that changed from the base of the PR and between cfc2f49 and a7da465.

📒 Files selected for processing (4)

• crates/frilvault-core/src/tests/helper.rs
• crates/frilvault-core/src/tests/mod.rs
• crates/frilvault-core/src/tests/note_service_test.rs
• crates/frilvault-core/src/tests/workspace_index_repository_test.rs

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