fix: refactored UI & guide per Rael's feedback

[blueogin]

Description

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[Copilot]

Copilot review overview

🟡 Changes recommended

Required Playwright coverage and tracked screenshots are missing or outdated for the modified UI states.

Review effort: Balanced
Findings: 1 · 1

Open (2)

• Add coverage for private key backup and import guidance · New
• Update credits management screenshot for changed labels · New

What changed in this PR

Refines AI Credits widget copy and Antseed signer-key guidance.

Changes:

• Simplifies credit-management labels.
• Adds explicit backup instructions before replacing an Antseed signer key.

File	Description
CreditsManagementCard.tsx	Updates balance labels.
GenerateSignerKeyPanel.tsx	Adds a numbered signer-key backup step.

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