docs: add some missing documentation

Author: Slartibartfass2

src/lib/components/composites/list/NamedList.svelte

@@ -12,6 +12,7 @@
         showNumberOfListItems?: boolean;
         numberOfItems?: number;
         emptyHint?: string;
+        errorHint?: string;
         preListContent?: Snippet;
     }
 
@@ -23,7 +24,8 @@
         numberOfSkeletons,
         showNumberOfListItems = false,
         numberOfItems = undefined,
-        emptyHint = "",
+        emptyHint = "No items found.",
+        errorHint,
         preListContent = undefined,
     }: NamedListProps = $props();
 </script>
@@ -90,11 +92,12 @@ This can be e.g. a search bar.
             </ul>
         {/if}
     {:catch error}
+        {console.error(`Could not load items: ${error}`)}
         <h2>{listName}</h2>
         {@render preListContent?.()}
         <div class="flex flex-row items-center gap-x-2 p-4">
             <CircleAlert size={20} class="text-neutral-500" />
-            <span class="text-error">{error}</span>
+            <span class="text-error">{errorHint ? errorHint : error}</span>
         </div>
     {/await}
 </div>

src/lib/components/composites/paper-components/paper-view/cards/ReferencesAndCitationsCardContent.svelte

@@ -39,6 +39,8 @@
             items={backwardReferencedPapers}
             showNumberOfListItems
             numberOfSkeletons={3}
+            emptyHint="No references found."
+            errorHint="Couldn't load references."
         >
             {#snippet preListContent()}
                 <SearchBar onSearch={filterBackwardReferencedPapers} timeoutInMs={0} />
@@ -57,6 +59,8 @@
             items={forwardReferencedPapers}
             showNumberOfListItems
             numberOfSkeletons={3}
+            emptyHint="No citations found."
+            errorHint="Couldn't load citations."
         >
             {#snippet preListContent()}
                 <SearchBar onSearch={filterForwardReferencedPapers} timeoutInMs={0} />

src/lib/components/composites/search-bar/SearchBar.svelte

@@ -54,9 +54,12 @@ and the search method is triggered with an empty string,
 so if no further handling exist, all elements are retrieved
 by the search.
 
+To limit the amount of calls (if used with backend calls), the search only starts after a
+specified timout in which no other events occur. The default for this is 500 ms.
+
 Usage:
 ```svelte
-    <SearchBar placeholderText={yourText} onSearch={yourCallback} />
+    <SearchBar placeholderText={yourText} onSearch={yourCallback} timeoutInMs={500} />
 ```
 -->
 <div class="relative w-full">

src/lib/model/general.ts

@@ -19,6 +19,13 @@ interface ProjectListEntryInterface {
     statistics: Project_Statistics;
 }
 
+/**
+ * Interface for the paper list entries.
+ *
+ * It either takes a Paper or a Project_Paper object.
+ * According to this the projectId is either undefined or a string
+ * and the showReviewStatus is either false or a boolean value.
+ */
 type PaperListEntryInterface =
     | {
           projectId: undefined;