The 30s timeout on the client.New HTTPClient was hard-coded and
opaque. Long-running paginated reads against slow networks were
tripping it with no escape hatch.
Lift the value into a named constant and let .veans.yml override it
via a new optional http_timeout field (Go duration syntax, e.g.
"60s", "5m"). The field has omitempty so a freshly-written
.veans.yml from `veans init` doesn't surface the knob — operators
who need to tune it can hand-edit, but it stays out of the way for
the common case.
Runtime loader applies the override after client.New if set;
bootstrap- and login-time clients (built before .veans.yml exists)
keep the default.
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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