feat: add success feedback for todo create/edit operations

[jezweb]

Summary

Adds clear user feedback during todo creation and editing using toast notifications.

Changes

• Import react-hot-toast and useRouter in todo-form component
• Use toast.promise() to show loading, success, and error states
• Display "Creating/Updating todo..." during operation
• Show success message before redirect completes

Benefits

• Clear feedback: Users see confirmation that their action succeeded
• Loading state: Shows "Creating/Updating todo..." during operation
• Error handling: Displays specific error messages if operation fails
• Professional UX: Modern promise-based toast pattern

User Experience

Before: Form submits → redirect happens → no feedback
After: Form submits → "Creating todo..." → "Todo created successfully!" → redirect

Testing

1. Create a new todo → see "Creating todo..." then "Todo created successfully!"
2. Edit existing todo → see "Updating todo..." then "Todo updated successfully!"
3. Verify redirect still works after success message

Addresses missing success feedback identified in UX improvement audit.

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📥 Commits

Reviewing files that changed from the base of the PR and between a44687a and 1f0d87e.

📒 Files selected for processing (1)

• src/modules/todos/components/todo-form.tsx (3 hunks)

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