The project picker used to require at least one pre-existing project
and would otherwise hard-error: "no projects visible to this user —
create one in the Vikunja UI first". Now it always offers an extra
numbered entry "Create a new project" and, when the user picks it,
prompts for a title (required) + identifier (optional). Empty-list
case routes straight to creation.
Backed by a new client.CreateProject(ctx, *Project) method (`PUT
/projects`); the e2e harness now uses that instead of the raw c.Do
call it did before.
Also fixed a latent bufio bug in StdPrompter.ReadLine that this work
surfaced: every call created a fresh bufio.Reader, which read-ahead a
buffer and threw it away on return. Second+ prompts read empty. Reuse
one buffered reader on the StdPrompter instance.
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