chore: use `undefined` instead of `UNKNOWN_ID`

web/src/components/Memo.tsx

@@ -108,7 +108,7 @@ const Memo: React.FC<Props> = (props: Props) => {
       const tagName = targetEl.innerText.slice(1);
       const currTagQuery = locationService.getState().query?.tag;
       if (currTagQuery === tagName) {
-        locationService.setTagQuery("");
+        locationService.setTagQuery(undefined);
       } else {
         locationService.setTagQuery(tagName);
       }

web/src/components/ShortcutList.tsx

@@ -63,7 +63,7 @@ const ShortcutContainer: React.FC<ShortcutContainerProps> = (props: ShortcutCont
 
   const handleShortcutClick = () => {
     if (isActive) {
-      locationService.setMemoShortcut(UNKNOWN_ID);
+      locationService.setMemoShortcut(undefined);
     } else {
       if (!["/"].includes(locationService.getState().pathname)) {
         locationService.setPathname("/");

web/src/components/TagList.tsx

@@ -94,7 +94,7 @@ const TagItemContainer: React.FC<TagItemContainerProps> = (props: TagItemContain
 
   const handleTagClick = () => {
     if (isActive) {
-      locationService.setTagQuery("");
+      locationService.setTagQuery(undefined);
     } else {
       utils.copyTextToClipboard(`#${tag.text} `);
       if (!["/"].includes(locationService.getState().pathname)) {