feat(theme-studio): visible size-nav buttons + 48 pt gallery scale

The preview dropdown gets flanking nav buttons, matching the view selector, so the size steps with a click. Left/Right arrows do the same when the dropdown is focused. Both clamp at the ends and disable on a single-pane app.

I extended the size scale to 32 and 48 pt for inspecting a glyph's detail. The cell width scales with the size, so beyond about 48 pt the grid is mostly scrolling.

I removed the separate hover info line beside the dropdown. Each glyph's own title tooltip already shows its face and color, so the line was redundant.

A new computed-style gate confirms the point size renders to the right pixels (24 pt is 32 px), so the pt label isn't lying.

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