Add member's login

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The issue title suggests adding a member login feature, but the body is empty. Look at the repository's codebase to understand the current authentication flow, if any. Check for existing UI components in the frontend (React) and backend logic in Rust (Tauri). Determine what 'member' means in this context and what login mechanism (e.g., OAuth, local) is required. Review similar features in the project or related documentation to scope the work.

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