phsl / new-api

This commit enhances the “Copy Selected Tokens to Clipboard” feature in `TokensTable.js` by introducing a user-friendly modal that lets users choose how they want to copy tokens.

Changes made
• Replaced direct copy logic with a `Modal.info` dialog.
• Modal displays the prompt “Please choose your copy mode”.
• Added two buttons in a custom footer:
  – **Name + Secret**: copies `tokenName    sk-tokenKey`.
  – **Secret Only**: copies `sk-tokenKey`.
• Each button triggers the copy operation and closes the dialog.
• Maintains existing validations (e.g., selection check, clipboard feedback).

Benefits
• Gives users clear control over copy format, reducing manual editing.
• Aligns UI with Semi UI’s best practices via custom modal footer.

No backend/API changes are involved; all updates are limited to the front-end UI logic.