fix: call removeItem on auto-dismiss timer expiry in Toast component

[yashrajpurohit7]

Closes #674

The auto-dismiss timer in Toast.tsx had a split dismissal
path. The manual dismiss button correctly runs the hide
animation and then calls removeItem(id) after 400ms. The
autoDismiss useEffect only set hide = true and never called
removeItem, so auto-dismissed toasts stayed in the parent
toasts state array forever.

What I changed:

• After setHide(true) fires in the timer, added a second
  setTimeout that calls removeItem(id) after 400ms — same
  timing as the manual dismiss button's animation
• Added autoDismiss and id to the effect's dependency array
  since both are used inside it but were missing

This brings the auto-dismiss path in line with the manual
dismiss path — both now remove the toast from state after
the hide animation completes.

Files changed:

• src/components/Toast.tsx

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