refactor: ui/dashboard becomes ui/overzicht-secties (RD-36)

RD-03 moved the dashboard page to overzicht/ui/overzicht.page.ts and left four
sections in registratie/ui/dashboard/. The folder was named after a page that
lives in another context. A reader who opened it found four sections that are
not the dashboard.

The folder is now overzicht-secties/ — registratie's sections for the overzicht
page. The alias does not change, because the sections stay in the registratie
context. The story titles do not change, because they name the context.

Five documents cited registratie/ui/dashboard.page.ts, a file that RD-03
renamed. They now name overzicht.page.ts, or the section that owns the
behaviour they describe.

The /dashboard route keeps its path. It is a user-visible URL.

npm run ci --full passes: 67 and 45 storybook suites, 306 axe tests.

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

docs/project/readable-codebase/README.md

@@ -130,7 +130,7 @@ two. Note that RD-15 exists because 22 abandoned agent worktrees are still on di
 | RD-33 | CLAUDE.md + `atomic-design.mdx` + the `ui-component` skill                   | 03, 27, 29 | yes       | done   |
 | RD-34 | _(optional)_ `NO_SUBORGS`/`NO_TABLES` become `RemoteData.Empty`              | 11         |           | todo   |
 | RD-35 | _(optional, last, alone)_ upload `type:` discriminant to `tag:`              | 27         |           | todo   |
-| RD-36 | `ui/dashboard/` → `ui/overzicht-secties/` + 2 stale `dashboard.page` paths   | 04         | yes       | todo   |
+| RD-36 | `ui/dashboard/` → `ui/overzicht-secties/` + 2 stale `dashboard.page` paths   | 04         | yes       | done   |
 | RD-37 | **a11y:** 5 suppressions name a closed ticket — decide the `li[…]` host      | 01         | yes       | done   |
 | RD-38 | One member order for the 3 wizard containers + 2 pure extractions            | 22, 23     |           | done   |
 | RD-39 | **Bug:** the wizards' `seed` input never arrived (21 stories)                | 38         | yes       | done   |