refactor: story titles to Domein/<Context>/<Name>; add 2 missing stories (RD-04)

Three dashboard-section stories used a fourth title segment
(`Domein/Registratie/Dashboard/<Name>`) that the sidebar rule does not have.
Drop the `Dashboard/` segment so all story titles follow the one rule from
CLAUDE.md decision 5.

Add the two missing stories for sections that have more than one visual
state: `wat-moet-ik-regelen` (4 states) and `wat-wilt-u-doen` (2 states, the
first story in the new `Domein/Overzicht/` bucket). `beheer-links` gets no
story — it has one visual state and its other branch renders nothing.

The `MetTaken` story disables the a11y addon with the same reason and WP-11
reference already used on `task-list.stories.ts` and `choice-list.stories.ts`:
`app-choice-link`'s host sits between the keuzelijst `<ul>` and its `<li>`,
a pre-existing structural gap this ticket does not fix.

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

apps/ssp/src/app/registratie/ui/dashboard/mijn-aanvragen.section.stories.ts

@@ -34,7 +34,7 @@ function storeStub(aanvragen: RemoteData<Error | undefined, Aanvraag[]>, lastErr
 }
 
 const meta: Meta<MijnAanvragenSection> = {
-  title: 'Domein/Registratie/Dashboard/Mijn Aanvragen',
+  title: 'Domein/Registratie/Mijn Aanvragen',
   component: MijnAanvragenSection,
   decorators: [applicationConfig({ providers: [provideRouter([])] })],
 };