Correct README claim about new task-card animation

[coderabbitai]

Summary

Align the README claim that only the new task card animates with the actual first-mount behavior.

Required changes

• Either change the implementation so only the created card animates, or correct the README.

Affected areas

• README.md
• Task card animation implementation, if behavior is changed

Acceptance criteria

• Documentation accurately describes card animation behavior.
• If the documentation keeps the “only the new card” claim, first-mount behavior satisfies that claim.

Source

• Review comment: Feature/bonus points #39 (comment)
• Pull request: Feature/bonus points #39
• Requested by: @Alejandroq12

[coderabbitai]

Technical note

Separate initial list rendering from newly created-card rendering. Track the created task ID and apply the entrance class only when a card ID matches it. Clear that marker after the animation if needed. Do not infer “new” from mount timing because filtering and refetching can mount many cards.

Reference: MDN: CSS animations

[coderabbitai]

Engineering note

Define the animation trigger in terms of stable task identity. Initial list mount and insertion of one new task are different events. Test a first page load, a filtered-list change, and a create mutation so the README describes all three cases correctly.

Read: React: Rendering lists and keys