Freegle / Iznik / 22123

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master: 71%

Pull #804

circleci

fix(modtools/stdmsg): auto-grow the standard-message edit boxes

The plain editor box and the segmented-editor boxes (prose `text` segments and
`editthis` fill-ins) were `b-form-textarea` with rows/max-rows. bootstrap-vue-
next`s b-form-textarea does not actually grow with max-rows -- which is exactly
why AutoHeightTextarea exists (it monitors the textarea scrollHeight and adds
rows). So the new segmented boxes (#755) had a 3-line minimum but never grew
to fit longer content.

Swap the three std-message edit boxes to AutoHeightTextarea (single-root
b-form-textarea wrapper, so class/v-model/placeholder all forward) keeping the
same rows/max-rows, so they now grow to fit. AutoHeightTextarea is already the
auto-grow component used in NewsReply/NewsThread/chitchat.

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