feat(web): /fields two-pane screen (grouped list + create form) + nav (no stubs left)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/i18n/en.json

@@ -29,6 +29,22 @@
     "resultCount_other": "{{count}} results",
     "selectPrompt": "Select a result to see the full record"
   },
+  "fields": {
+    "title": "Fields",
+    "newField": "New field definition",
+    "key": "Key",
+    "type": "Type",
+    "vocabulary": "Vocabulary",
+    "authorityKind": "Authority kind",
+    "anyKind": "Any",
+    "group": "Group",
+    "required": "Required",
+    "create": "Create field",
+    "empty": "No field definitions yet",
+    "loadError": "Could not load",
+    "other": "Other",
+    "types": { "text": "Text", "localized_text": "Localized text", "integer": "Integer", "date": "Date", "boolean": "Boolean", "term": "Term", "authority": "Authority" }
+  },
   "publish": {
     "heading": "Visibility",
     "advanceInternal": "Advance to internal",

web/src/i18n/sv.json

@@ -29,6 +29,22 @@
     "resultCount_other": "{{count}} träffar",
     "selectPrompt": "Välj en träff för att se hela posten"
   },
+  "fields": {
+    "title": "Fält",
+    "newField": "Nytt fältdefinition",
+    "key": "Nyckel",
+    "type": "Typ",
+    "vocabulary": "Vokabulär",
+    "authorityKind": "Auktoritetstyp",
+    "anyKind": "Alla",
+    "group": "Grupp",
+    "required": "Obligatoriskt",
+    "create": "Skapa fält",
+    "empty": "Inga fältdefinitioner ännu",
+    "loadError": "Kunde inte ladda",
+    "other": "Övrigt",
+    "types": { "text": "Text", "localized_text": "Lokaliserad text", "integer": "Heltal", "date": "Datum", "boolean": "Boolesk", "term": "Term", "authority": "Auktoritet" }
+  },
   "publish": {
     "heading": "Synlighet",
     "advanceInternal": "Gör intern",