Fixes the copy on new sessions, some additional styling work

src/components/documents/NewRelatedDocumentForm.tsx

@@ -1,4 +1,8 @@
-import { RelationshipType, type CampaignId, type Document } from "@/lib/types";
+import {
+  RelationshipType,
+  type CampaignId,
+  type AnyDocument,
+} from "@/lib/types";
 import { NewLocationForm } from "./location/NewLocationForm";
 import { NewMonsterForm } from "./monsters/NewMonsterForm";
 import { NewNpcForm } from "./npc/NewNpcForm";
@@ -6,10 +10,6 @@ import { NewSceneForm } from "./scene/NewSceneForm";
 import { NewSecretForm } from "./secret/NewSecretForm";
 import { NewTreasureForm } from "./treasure/NewTreasureForm";
 
-function assertUnreachable(_x: never): never {
-  throw new Error("DocumentForm switch is not exhaustive");
-}
-
 /**
  * Renders a form for any document type depending on the relationship.
  */
@@ -20,7 +20,7 @@ export const NewRelatedDocumentForm = ({
 }: {
   campaignId: CampaignId;
   relationshipType: RelationshipType;
-  onCreate: (document: Document) => Promise<void>;
+  onCreate: (doc: AnyDocument) => Promise<void>;
 }) => {
   switch (relationshipType) {
     case RelationshipType.Locations:
@@ -38,6 +38,4 @@ export const NewRelatedDocumentForm = ({
     case RelationshipType.DiscoveredIn:
       return "Form not supported here";
   }
-
-  return assertUnreachable(relationshipType);
 };