feat(web): dynamic FieldInput (text/integer/date/boolean/localized_text/term/authority)

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

web/src/i18n/en.json

@@ -4,5 +4,6 @@
   "auth": { "email": "Email", "password": "Password", "signIn": "Sign in", "signOut": "Sign out", "invalid": "Invalid email or password", "networkError": "Could not reach the server" },
   "objects": { "title": "Objects", "empty": "No objects yet", "loadError": "Could not load objects", "selectPrompt": "Select an object to view its details", "notFound": "Object not found", "prev": "Previous", "next": "Next", "of": "of" },
   "fieldsLabels": { "objectNumber": "Object number", "objectName": "Name", "count": "Number of objects", "briefDescription": "Brief description", "currentLocation": "Current location", "currentOwner": "Current owner", "recorder": "Recorder", "recordingDate": "Recording date", "visibility": "Visibility", "flexible": "Catalogue fields" },
-  "visibility": { "draft": "Draft", "internal": "Internal", "public": "Public" }
+  "visibility": { "draft": "Draft", "internal": "Internal", "public": "Public" },
+  "form": { "selectPlaceholder": "— select —" }
 }