First slice of the new sidebar destination outlined in
docs/landing-page-design.md. Static content only — embedded
docs (Phase B) and the live getting-started checklist
(Phase C) follow.
Phase A:
- New `WelcomePage` at `lib/pages/welcome.dart`, registered
as sidebar slot 0 above Doctor. Default selectedIndex stays
0, so a fresh launch lands on Welcome.
- Hero card: gradient backdrop matching the Today-Hero in the
store, F∆I Platform headline, subtitle taken from CLAUDE.md
("deterministic workflow engine for AI-assisted document
processing in regulated environments").
- Three-pillar row "Hub / Module / Flow" — operator-readable
prose, not architecture-doc dense. Stacks to a column under
640 dp window width so card text never gets cropped.
- Trust-posture deck — "Sandbox by default", "Tamper-evident
audit log", "Air-gap ready". Same content that used to
rotate as carousel slides in the store; reading them as a
single deck with full prose works better than rotating
through fragments.
- AppBar follows the same `titleSpacing: FaiSpace.xl`
alignment as the Store so the title sits flush with the
body padding.
- 13 new ARB keys for the page content (EN + DE).
Smoke test now expects "Welcome" in the navigation rail; the
existing `Doctor / Store / Flows / Audit / Approvals`
expectations stay unchanged.
Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>
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