chatAtoms.tsfeat(chat): rebuild the composer's controls, and give "New chat" one meaning
The composer's model picker, its send glyph, its attach button and the several things
called "New chat" all moved or broke into each other; this settles them together.
MODEL PICKER. Defaults to Cedar's fast runtime — the storage key is versioned, because
`atomWithStorage` only consults the default when the key is absent and every existing user
carried "low" from the old one. Options are marked rather than described: the Claude burst
in its own coral, Cedar's own logo in the row's ink. The list is the app's `OptionPicker`
rather than a menu of radio items, so it gets the same keyboard as every other "which one?"
— filter, arrows, and the ordinals 1-4. That picker was buried in `documents/table`, so it
moves to `components/ui` with `optionColor` and `PICKER_SURFACE_CLASS`.
Cedar's mark is the PNG used as a mask, not an image: the only asset is a dark-green sprig
on transparency, invisible on the dark composer with no light variant to swap to. `mask-size`
is 128% rather than `contain` because the asset's ink fills only 50% x 73% of its canvas —
under `contain` that padding scales into the icon box and a 16px mark drew 11.7px of logo.
SEND GLYPH. Shipped broken twice. Rotating the bars with a CSS transform put the arrowhead
somewhere else entirely (framer-motion writes `transformBox: fill-box` when the caller does
not, and a viewBox-unit origin then measures from each rect's own bbox); animating their
geometry left `stop` reading as `queue`, because the in-between of two poses is a glyph that
means nothing. Rotation is now an SVG attribute about one pivot, each pose is static, and the
only movement left is the fill cross-fading in CSS.
ONE "NEW CHAT". The rail started a context-free draft chat while ⌘N and the header button
minted a thread carrying the current one's context — a shortcut producing a different chat
than the button advertising it. All three now call `startNewChat`, which mints nothing until
you type and does not navigate. The agenda button leaves the header; `q` still opens it.
ATTACHING. The paperclip took `disabled={!mainThreadId}` and the drop zone refused a null
thread, so on every fresh chat the only way to enable attaching was to type something first.
Both now mint the thread, exactly as the first keystroke does.
The mic button is gone from the composer — ⌘M still dictates, the same key the mail composer
already uses.
Co-Authored-By: Claude Opus 5 (1M context) <<email>>Aug 30, 2026, 11:39 PMcrmAtoms.tsfeat: v0.5 working commandBarApr 11, 2026, 1:57 PM