feat(creators): add keyboard shortcut for list refresh

[iwayemi5]

Closes #377

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Summary

This PR adds a keyboard shortcut for manually refreshing creator list data without requiring mouse interaction.

Changes Made

• Added "Ctrl/Cmd + Alt + R" keyboard shortcut to refresh creator list data.
• Reused the existing creator refresh/refetch handler to avoid duplicating fetch logic.
• Added a brief accessible visual status indicator to confirm shortcut activation.
• Added the shortcut to the marketplace keyboard shortcut legend.
• Updated project documentation (README) with the new shortcut.
• Prevented shortcut activation while users are typing in:
  • input fields
  • textareas
  • select elements
  • content-editable regions
• Ignored repeated keydown events to prevent accidental multiple refreshes.

Testing

• Added "LandingPage.keyboard.test.tsx" covering:
  • creator list refresh via keyboard shortcut
  • prevention of shortcut activation within editable fields
• Ran "git diff --check" successfully.
• Automated test execution was not completed because project dependencies were not fully installed in the local environment.

Acceptance Criteria

• Keyboard shortcut triggers creator list refresh.
• Visual feedback confirms shortcut activation.
• Shortcut is documented in the keyboard shortcut legend.
• Existing refresh logic is reused.
• Accessibility considerations were maintained.

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