show arrow indicator for page size inc/dec

make adaptions for mobile that doesn't have a mouse, thus mouseovers

show fold indicator on the pages

should show pages for all fold levels

for hasfinal should show margins, etc at all unfolded OR all folded

red line for unstaplable edge


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DONE showing front versus showing back
DONE showing partial folds frelled.. reallocation error?
DONE sliding
DONE save

