feat: replace copied tooltip with react-hot-toast success notification

[Ghadaffijr]

• Import showToast from @/utils/toast.util in CopyField.tsx
• Fire showToast.success('Address copied to clipboard', { duration: 2000 }) on copy
• Retain CopySuccessAnnouncement for screen reader accessibility
• Keep copied state for Check icon visual feedback on the button

Closes #454

Summary

• Replaces the Copied! tooltip on the wallet address copy button with a react-hot-toast success notification in CopyField.tsx
• On click, showToast.success('Address copied to clipboard', { duration: 2000 }) fires using the existing showToast utility already used across the app, no new dependencies introduced
• Retains CopySuccessAnnouncement and useCopySuccessAnnouncement for screen reader accessibility, the live region announcement and the toast serve different purposes and do not conflict
• Keeps the copied state and Check icon swap on the button for visual feedback during the 2-second window

Closes #454

Testing

• pnpm lint
• pnpm build is clean, zero errors

Checklist

• Linked issue or backlog item
• Scope is limited to the stated change
• Updated docs if behavior or setup changed
• Added screenshots for UI changes when relevant — toast appears bottom-center on copy button click and auto-dismisses after 2 seconds

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