Migrate: WithdrawalCredentials, feat: add ui/spinner, deprecate: old Input

[wackerow]

Description

• Adds simple ui/spinner component using CgSpinner icon and animate-spin, passing through ref/className to wrapping div
  
• Refactors WithdrawalCredentials component to Tailwind
• Uses ui/alert component with success and error variants to align with DS.
• Migates to ui/input component
• Deprecates @/components/Input—no longer being used

Related Issue

• shadcn migration
• color theme updates

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[pettinarip]

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