fix: re-index state array after block deletion to prevent undefined k…

[Davitamgl]

🐛 Fix: Crash when deleting blocks sequentially

Closes #15

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Problem

Deleting the first block then trying to delete any remaining block threw:

ErrorException: Undefined array key 0

After unset($items[0]), PHP keeps the original keys — so the array goes from [0, 1, 2] to [1, 2]. The blade template always passes $loop->index (0-based) as the index argument. On the next delete, it sends index = 0, but key 0 no longer exists in the state array.

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Fix

Use array_values() after unsetting to reset keys back to 0, 1, 2...

// Before
$component->state($items);

// After
$component->state(array_values($items));

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Test

Added a regression test that creates 2 blocks, deletes the first, then deletes the second — covering the exact scenario that was broken.