* ♻️ Use a DS icon button for the guide defaults menu
Replace the raw three dots button that opens the use default / set as
default menu of a guide with the DS ghost icon button. It had no label, so
it gets a new "Guide defaults" one, shown in the DS tooltip, and
aria-pressed while the menu is open instead of the selected class.
The add, show/hide and remove guide buttons, and the new one, sit at the
right edge of the sidebar: open their tooltips above and to the left.
The advanced options toggle stays a raw button: it is one segment of the
guide type control and an icon button would break that shape.
Add a visual test that adds a guide to a board and opens its advanced
options.
AI-assisted-by: claude-opus-5-5
* ♻️ Remove guide defaults button styles
The three dots guide defaults button is a DS icon button now: delete the
.show-more-options rule, its state variables and its svg rule. The rest of
frame_grid.scss already uses DS tokens.
AI-assisted-by: claude-opus-5-5
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