feat(home): first-run block as a numbered four-step thread with partner marks (#1149)

* feat(home): first-run block as a numbered three-step thread with partner marks

The founder-picked stepped shape for 'Hur vill du komma igang?':
1 Fa in din bokforing (primary Flytta bokforingen + Fortnox/Visma/Bokio
marks + '+ SIE'; Starta fran borjan as an inline alternative that just
checks the step off), 2 Koppla banken (Enable Banking mark only),
3 Bygg din bokforingsassistent (Beta chip, no vendor logo). Dots walk
number -> filled active -> sage check; the persisted state machine is
unchanged, but choosing a path no longer auto-completes the setup:
the block retires when all three steps are done (or via Dolj).
DashboardContent's build-assistant hero now waits until the checklist
is gone so the assistant is not pitched twice. initial_setup i18n
rewritten for the stepped copy (sv+en), unused selected-state keys
removed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* feat(home): Skatteverket as step three, assistant last, ticked steps collapse

Founder feedback on #1149: the thread is now four steps: 1 Fa in din
bokforing, 2 Koppla banken, 3 Anslut Skatteverket (with the SKV mark,
BankID authorize link; skipped entirely in builds without the
skatteverket extension), 4 Bygg din bokforingsassistent. A completed
step drops its description and actions and keeps only the checked
muted title, so the fresh-start pitch never lingers after the books
are in. The heading counts honestly ({count} steg) and completion now
requires all four steps.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* polish(home): one-line checklist header

Founder feedback: the title and sub-line said the same thing twice;
only '4 steg sa ar bokforingen igang' remains (Dolj stays beside it).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

app/api/onboarding/state/route.ts

@@ -87,7 +87,10 @@ export const PATCH = withRouteContext(
     const update: Record<string, unknown> = {}
     if (body.path !== undefined) {
       update.initial_setup_path = body.path
-      update.initial_setup_completed_at = body.path === 'fresh' ? now : null
+      // Choosing a path no longer completes the setup: since the stepped
+      // Hem block (rest-of-nav 2), "fresh" just checks off step one and the
+      // block completes when every step is done.
+      update.initial_setup_completed_at = null
       update.initial_setup_dismissed_at = null
     }
     if (body.completed !== undefined) {