A just-started assistant turn (message.start, no deltas yet) rendered an EMPTY
fallback <text> on the glyph's line plus the `▍` caret on a SEPARATE line below —
so `⚕` sat alone with the caret dangling beneath it, indented. Folded the caret
into the no-parts fallback so it renders inline with the glyph (` ⚕ ▍`); a settled
row still shows its flat text, a turn with parts renders the parts. 71 pass.
Live-smoked: streaming start now shows `⚕ ▍` on one line; the reply text then
aligns with the glyph.
alt-glitch
f423aebb80