Single tap now acts immediately instead of just selecting: an empty tile
opens the device picker, a filled tile opens its settings editor (this was
the double-tap behaviour; the highlight-only single-tap and the double-tap
are gone). Long-press clears the tile — but now via a confirmation dialog
("Clear tile") rather than wiping instantly, since clearing discards the
device and its settings with no undo (matches the preset DELETE confirm).
Long-pressing an empty tile does nothing.
Removes the now-unused per-tile `selected` state/highlight and onDoubleTap.
Verified on-device: filled→editor, empty→picker, long-press→confirm(Cancel
keeps the tile).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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