The UI half of the new-project flow (story T-486). A "New project…" welcome
action opens a dialog (location + name) that dispatches project.new (T-487),
opens the result, and announces it on projectCreatedChannel. The Claude
extension consumes that and shows the account roadblock — the embedded
per-workspace picker + accounts list, so a fresh project gets bound to an
account (or Default) right at birth.
The two halves stay decoupled: the welcome builtin only publishes the event
(no claude import); the claude builtin owns the account dialog. Only freshly-
created projects announce, so existing opens are never prompted.
Closes T-488. The non-repo "initialize as a project" path (T-489) is next.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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