fix(ui): reset the CopyButton checkmark after each copy

[abhay-codes07]

What

The CopyButton checkmark never resets. The reset timer runs once on mount with an empty dependency array — i.e. it fires (uselessly) two seconds after render, before any click — and nothing ever sets hasCopied back to false after a copy:

useEffect(() => {
    setTimeout(() => { setHasCopied(false) }, 2000)
}, [])

In the integrations install-steps (the component's consumer), the first copy click swaps the clipboard icon to a checkmark permanently; subsequent copies give no visual feedback at all.

Fix

Key the effect on hasCopied with proper cleanup — the same pattern the sibling copyable-cell.tsx already uses:

useEffect(() => {
    if (!hasCopied) return
    const timer = setTimeout(() => setHasCopied(false), 2000)
    return () => clearTimeout(timer)
}, [hasCopied])

Each copy now shows the checkmark for 2 seconds and reverts; rapid re-copies restart the window cleanly, and the stray mount-time timer is gone.

Testing

• bun run build in apps/web (the consumer) — clean
• biome check on the touched file — clean

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