Mythic Masters: line-up rows and buttons are written by the pen too, not the spreading drop (#3671 gap 3 follow-up) #3692

Follow-up to PR #3691 (the tome climb #3671, gap 3).

PR #3691 has a pen write each block of the tome line by line. write() in apps/mythic-masters/src/page.ts still skips two kinds of block, which keep the old drop that spreads from a point, cuts letters on its edge and speckles pictures:

• buttons, and anything matching .row, .menu, .menu > *
• any block that holds a button, input or select. This covers every line-up entry (.lineup > li has its "open the folio" button), so the line-up's beasts still come in speckled.

Next step: for a row that holds a button, write the text and pictures with the pen and fade the button in once the pen passes it, instead of skipping the whole row. Check with the frozen-frame recipe in #3691 (open the journal, click .r-lineup or .r-bestiary, pause every animation at a time).

Part of #3671.