feat(island): pure tile table and order helpers for controls

The controls panel's tiles, their icons and drawer pages, and every
operation on the visible list: normalize, hide, show, move, the drop
slot under a dragged tile, the audio fill and the scroll step. All pure,
so the edit mode's logic is tested under node rather than by dragging.

normalize keeps an empty list: hiding every tile is a choice, and only
a value that is not a list falls back to the default.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

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