Onboarding · Help: articles in a list the keyboard walks, a long address cut

HelpPanel lists its articles in lists::SelectableList: the list is one
stop whose cursor scrolls into view, and Enter or a double press opens
an article, focus going to All articles as before. SelectableList now
activates on Enter's release, armed by its own press, as the palette
and menus pick: an activation that moves focus left the release to
press what took it, here the way back. ContactSupport cuts a long
address in the middle and puts a Copy beside it. The lists tests move
into a folder, the release tests on their own.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

AGENTS.md

@@ -140,7 +140,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - A mode that leaves on Escape holds its own focus through `primitives::hold_focus`: turned on while focus is elsewhere, it takes focus so Escape reaches it, and `hand_back` returns it (`documents::ZenMode`, `collab::FollowMode`).
 - A chat holds at its newest message through gpui's `list` with `ListAlignment::Bottom`: it sticks while scrolled to the end, and `scroll_to` one past the last item sticks it again; that call sends no scroll event, so the owner clears its own away state (`chat::MessageList`).
 - Anything pressable is a Tab stop: a row, card or toggle takes `tab_index(0)` and `focus_ring`, with a 1px border that stays transparent where it shows none; gpui presses it on the release of Enter or Space.
-- A list of pressable rows goes through `lists::SelectableList`, whose cursor reaches them by key: Up and Down move, Enter or a double press activates (`media::Playlist`). A bare `ListItem` press is the pointer's only. Titled sections of such lists go through `lists::Sections`, for ChannelList, MemberList and MailboxList; each owner builds its rows and keeps its own checks.
+- A list of pressable rows goes through `lists::SelectableList`, whose cursor reaches them by key: Up and Down move, Enter or a double press activates (`media::Playlist`). Enter activates on its release, armed by its own press, so an activation that moves focus leaves the release nothing to press (`onboarding::HelpPanel`). A bare `ListItem` press is the pointer's only. Titled sections of such lists go through `lists::Sections`, for ChannelList, MemberList and MailboxList; each owner builds its rows and keeps its own checks.
 - Columns that must line up across rows sit absolutely at fractions of their row, as the bars over them do (`calendar::CalendarMonthView`): with real text, gpui 0.2.2 lets a `flex_1` cell's text widen it, and the test platform's fixed advances hide it.
 - A row that holds text beside fixed parts lets the text give way: the text takes `flex_1().min_w_0()` and an `Ellipsis`; counts, icons, dates and chevrons take `flex_none`. A label that must stay whole wraps in that block instead, as `forms::Checkbox`'s does.
 - A mark over a text field reads the field at paint time, from a canvas laid over it (`collab::RemoteCursor`): by then `TextInput::bounds_for` holds this frame's layout, and a still page never renders again to catch up.