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fix(modtools/stdmsg): editable prose in segmented editor + TN-aware $editlink (#750)

The segmented standard-message editor only let mods edit the highlighted
<editthis> boxes; the surrounding prose was a read-only span, so mods couldn't
tweak the rest of the reply. Render text segments as auto-sizing textareas so
the whole message is editable (the editthis boxes keep their amber must-fill
highlight). assembleSegments already emits text segments verbatim, so the edits
flow straight through to the recipient.

Also make $editlink TrashNothing-aware: TN members manage their posts on TN's
own "Your Posts" page (https://trashnothing.com/user/posts, per TN's help docs),
not ilovefreegle.org/myposts which would be a dead end for them. Detect TN via
tnuserid (or a trashnothing.com from-address as a fallback).

Tests: editable-prose rendering + send-through, TN/non-TN editLink and $editlink
substitution, and an assembleSegments text-edit case. 78 unit tests pass.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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