Acknowledge redundant null check feedback in FilterPanel

[Copilot]

Addressed review feedback on PR #58 regarding a suggested null check for this.$chipsContainer in the createChip() method.

Context

The review suggested adding a null check in createChip() before accessing this.$chipsContainer.querySelector('ul'). However, this check is redundant:

// updateChips() already guards against null
updateChips() {
    if (!this.filtersApplied || !this.$chipsContainer) {
        return  // Early return if chipsContainer is null
    }
    // ... later calls createChip()
}

// createChip() is only called from within updateChips()
createChip(label, key, value) {
    // ... 
    this.$chipsContainer.querySelector('ul').appendChild(chip)  // Safe - already checked
}

Since createChip() is only invoked from updateChips() (lines 98, 122), and updateChips() has a guard clause at line 73, the existing code is already safe. No changes needed.

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