Add Playwright E2E tests for the "show less / more" chip collapse behavior introduced in [d97be849](https://github.com/osbuild/image-builder-frontend/pull/4160).

Tests cover:

• Kernel arguments
• Timezone NTP servers
• Systemd services (enabled, disabled, and masked)

Each test verifies:

• All chips visible when 4 or fewer items
• Chips collapse with "X more" button when exceeding threshold
• Expanding via "X more" and collapsing via "Show less"
• Collapse controls disappear when items drop back below threshold