[Existing app][Contacts Import] Polish existing interaction states and copy

[kryputh]

Summary

Improve the existing Contacts Import surface. This issue is intentionally scoped to existing app code and should not introduce a new standalone tool or unrelated feature.

Current area

import wizard steps, contact parser, malformed row handling, preview data, and contact import types

Relevant paths

• src/features/contacts/ImportWizard.tsx
• src/features/contacts/parseContacts.ts
• src/features/contacts/types.ts

Goal

improve the current contacts import wizard so contact data parsing is transparent and recoverable.

Work focus

Tighten the existing visual and interaction states: default, hover, focus, active, disabled, loading, empty, and error. Keep the current product behavior, but make the surface feel intentional and consistent with the Stealth Mail visual system.

Acceptance criteria

• Existing behavior remains intact; this is polish, not a new module.
• Primary and secondary actions have clear labels, disabled states, loading states, and empty states where applicable.
• The surface uses existing tokens/components before introducing new styling.
• Screenshots or a short before/after note are included in the PR.

Scope guardrails

• Keep the work inside the relevant existing app/module paths above unless a small shared helper is clearly justified.
• Do not add a new V1/V2 tool folder for this issue.
• Do not use real user data, secrets, private keys, or live customer mail.
• Keep copy and UI aligned with the Stealth Mail safety, speed, and sender-control positioning.

Suggested validation

• Run the most relevant unit or e2e tests for the touched area.
• Run �un x tsc --noEmit and �un run lint when the local environment supports the project dependency install.

[gloskull]

Hello, I have 4 years of experience delivering solutions for projects like this, covering backend, frontend, and smart contract development. After carefully reviewing your requirements, I have a clear understanding of the task and am confident in my ability to deliver a clean, efficient, and thoroughly tested solution on time. I prioritize code quality, maintainability, and industry best practices throughout the development process.

[Kureszn]

I've reviewed the issue and believe I can contribute effectively. My experience spans software development, blockchain technologies, cybersecurity and open source collaboration. I take a structured approach to contributions carefully understanding the existing codebase, identifying the root cause and delivering a thoroughly tested implementation.