feat: make comment sort order configurable, newest-first by defaultHEADmain

I added pearl-comment-sort-order to choose how an issue's comments render under the Comments heading: newest-first (the default, most recent on top) or oldest-first (chronological, like an email thread). Both the render sort and the add-comment insertion point honor it, so a new comment lands at the top for newest-first and at the bottom for oldest-first.

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