feat(admin-ui): editor 6-tab layout (Stage 3.4)

Dictionary editor route теперь имеет TabBar (handoff design Stage 3.4):
  Records | Relations | Fields | JSON | Events | History

URL-synced через ?tab= (default: records). Backward-compat: старый
?view=hub auto-remap'нется в ?tab=relations при mount'е.

Tab contents:
- records (default): существующий records table + filters + edit modal
  flow — без изменений, обёрнут в conditional render
- relations: DictionaryHubView (был раньше при view=hub)
- fields: schema properties summary — name/type/required/unique/i18n/FK/desc
- json: pretty-printed schemaJson read-only
- events: link к /audit с pre-filled dict filter
- history: placeholder (schema version timeline — backend endpoint pending)

EditorTabBar — inline component с handoff styling (border-b border-line +
active accent border + font-semibold), -mb-px overlap для clean look.

Hub view's neighbor cards теперь search={tab:'relations'} вместо
view='hub' (consistent с new param).

DictionaryDependentsPanel рендерится только в Records tab — auto Hub view
в Relations tab уже включает dependents через свой layout.

Tests: 116/116 PASS, build green, TS clean.

ordinis-admin-ui/src/components/lineage/DictionaryHubView.tsx

@@ -53,7 +53,7 @@ const NeighborCard = ({
   <Link
     to="/dictionaries/$name"
     params={{ name: dict.name }}
-    search={{ view: 'hub' }}
+    search={{ tab: 'relations' }}
     className={`group block bg-white border border-line rounded-lg p-3 transition hover:shadow-hover hover:border-accent/40 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent/40 ${
       side === 'left' ? 'text-right' : 'text-left'
     }`}