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A sheet can hide its outline's level buttons and brackets while keeping
the outline (Excel's Ctrl+8, saved as showOutlineSymbols="0"). It wasn't
modelled, so such sheets showed a wide outline band Excel doesn't.
- model: Sheet::show_outline_symbols (default on, also for older JSON).
- xlsx: read and written on the sheet view.
- engine: view.showOutlineSymbols {on?} (Ctrl+8), undoable.
- ui: no outline bands while it's off.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>