fix(island): review findings in the controls panel

Edit mode let a right-click and the wheel through to the tile, so a
right-click opened the drawer and scroll changed volume, against the
spec. The drag area now takes both buttons and the wheel.

A scroll up on a level already above the cap, such as a mic set to 120%
elsewhere, snapped it down to the cap. The cap now only stops a step up.

Prefs logs a failed write, which printErrors off had silenced: the new
order would otherwise vanish at the next restart with no trace. Its
parsed object is renamed from data to doc, so it cannot shadow a base
property of that name.

The spec now says what was built: JSON.parse rather than a JsonAdapter,
and the helper list as it is.

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

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