Fix: Allow cycles parameter to accept 0 to disable auto-switching

[Lasithih]

Fix: Allow cycles parameter to accept 0 to disable auto-switching

Problem

The dashboard frontend currently parses the cycles input value using:

parseInt($(item).find('.cycles-input').val()) || 10

This causes 0 to be treated as falsy, defaulting to 10 instead of being accepted as a valid value.

Solution

Use the nullish coalescing operator to properly handle 0:

parseInt($(item).find('.cycles-input').val()) ?? 10

Backend Compatibility

The switcher script already supports 0 to skip refreshing:

# Only run refresh logic if cycle_target is greater than 0
if [ "$cycle_target" -gt 0 ]; then

Use Case

When displaying static dashboards (e.g., Grafana), disabling the xiosk-switcher service gets overridden on configuration updates. Setting cycles=0 provides a cleaner way to disable auto-switching without stopping the service.

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Related to #63