v0.41.2

Fixed

• Widget inner border now follows the cell's corner radius. When a page had a non-zero corner_radius, the cell rounded its corners + overflow: hidden clipped the inner widget's 1px border rectangle at the curves so the border looked truncated. The cell now exposes its radius as a --cell-corner-radius CSS variable that crosses the shadow DOM boundary, and .w in spectra-widgets.css uses it as the default for its own border-radius. The widget's outer edge curves to match the cell cleanly.

Changed

• Matting colour default → white. Pages used to default to bleed_color = "" which fell back to var(--bg) (theme-following) and showed as black in the editor's colour picker (the macro's fallback). New pages now default to #ffffff. Existing pages with an empty value also read as white in the editor; rendering is unchanged for pages with an explicit colour.
• picture_gallery renamed for the widget picker. Was "Gallery Core" landing under the "Other" group; now "Picture, Gallery" so the picker's split-on-comma convention groups it under Picture next to NASA APOD. Same widget id, no migration.