+workbook-create / +table-put apply cell_styles by writing them into the
in-memory matrix, whose size was fixed to the data (cols × rows). A style
range reaching past that extent was rejected as "outside the write range",
so blank cells (reserved regions, decorative headers, empty borders) could
not be styled on the typed --sheets path — only the untyped --values path
padded for it.
Pad the matrix down/right to cover every cell_styles range before applying
(empty cells appended for the uncovered positions), mirroring the --values
behavior. writeSheetData now derives the written width/range from the padded
matrix; both dry-run previews and sheetCreateDims account for the style
extent so the physical grid and the plan match Execute. Ranges above/left of
the write anchor stay rejected (the matrix only grows down/right).
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