Design Text Height Incorrect

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Text not rendered a defined height:

Value states 250

Measured at 180

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Need to use cairo font extents.

https://www.cairographics.org/tutorial/#L1understandingtext

https://www.cairographics.org/manual/cairo-cairo-scaled-font-t.html#cairo-font-extents-t

This needs to be implemented in GJS:

https://gitlab.gnome.org/GNOME/gjs/-/blob/master/modules/cairo-context.cpp?ref_type=heads#L773

Also See font matrix

https://gitlab.gnome.org/GNOME/gjs/-/blob/master/modules/cairo-context.cpp?ref_type=heads#L780

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See MR for GNOME GJS: https://gitlab.gnome.org/GNOME/gjs/-/merge_requests/1073

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This needs more work when the GJS changes are landed