See the post before you post it.

A draft is written as plain text but doesn't arrive as plain text: a URL
ending in .jpg becomes a picture, a youtu.be link becomes a player, a
nostr: reference becomes the note it points at, an npub becomes a name.
The only way to find out how yours would land was to send it.

The eye beside the paperclip — on the composer and on a reply — opens a
preview. It runs the draft through noteBody, the very renderer the feed
uses, so this isn't a lookalike of the real thing: it IS the real thing,
in a dashed frame with a PREVIEW label so it can never be mistaken for
the post itself. It follows the draft live while it's open (and only
while it's open — a render per keystroke is not free).

Attaching a picture opens it by itself. Showing you what you attached is
the answer to the question attaching it raises, and it costs no tap.

tools/compose-preview-test.js covers both the composer and a reply: the
picture renders rather than sitting there as a URL, the YouTube link
becomes a player, the preview tracks typing, and it puts itself away.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_019mrt228Upn9nNCwGixzSLx

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