Pages such as potidaea.asm put their background on <html> and leave
<body> transparent; the editor's base stylesheet paints <body> white,
so the imported page showed light text on white. The canvas body now
stays transparent, which also matches the exported page.
The gateway's public name route sends Access-Control-Allow-Origin so
Studio on sirius.x can fetch a page's stylesheets and inline them
instead of falling back to links; the route only serves public content.
The language picker had no toolbar to attach to in Studio and floated
over the blocks panel; pages can now mark a slot for it and Studio does.
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