Reworks the Setup-Assistent toward the zero-learning-curve bar
(docs/architecture/guided-setup.md, phase 1.1):
- Every scenario/intent/target choice is now a localized option CARD
with a one-line plain-language explanation of what it configures
(DE+EN, Sie-form) — replacing the bare dropdowns whose labels were
English enum humanizations ('Regulated Production', 'This Laptop').
- Three explained steps with a 'Schritt n von 3' progress line
(stakes → task → environment); the two adaptive toggles move to the
last step in plain language (no 'air-gapped' jargon).
- The review step renders a localized PLAIN-LANGUAGE summary built
from 'chain init --answers --plan-json' (the structured SetupPlan) —
'Ch∆In richtet einen regulierten Betrieb ein: signierte Module
verlangt · … · geändert wird nur ~/.chain/config.yaml' — instead of
echoing the CLI's English prose. Warns when an existing config will
be overwritten. After apply: a plain 'Fertig' + next steps.
flutter analyze clean; widget tests for the step flow + German option
labels. Remaining per plan: clickable follow-up actions, signature
dead-end fix, placement/auto-open, and the LLM free-text path.
Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>
A Welcome 'Setup assistant' button opens a wizard that collects
scenario / intent / target (+ approval & data-local toggles), then calls
`chain init --answers` to preview the assembled plan and `--apply --force`
to write the config — reusing the Rust deterministic engine, no logic
duplicated. New SystemActions.chainInit; copyable errors via
showFaiProcessError; EN+DE l10n. analyze clean; smoke test + existing
welcome/sidebar tests pass.
Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>
