diff --git a/web/src/components/AppSidebar/AppSidebar.tsx b/web/src/components/AppSidebar/AppSidebar.tsx
index 51e950f5..be91ed05 100644
--- a/web/src/components/AppSidebar/AppSidebar.tsx
+++ b/web/src/components/AppSidebar/AppSidebar.tsx
@@ -270,7 +270,6 @@ const MemoDetailSidebarContent = () => {
       memo={memoDetail.memo}
       parentMemo={memoDetail.parentMemo}
       parentPage={memoDetail.from}
-      parentScope={memoDetail.fromScope}
       hasExplicitOrigin={memoDetail.hasExplicitOrigin}
       commentCount={memoDetail.commentCount}
       forceReadonly={memoDetail.readonly}
diff --git a/web/src/components/AttachmentLibrary/AttachmentLibraryPrimitives.tsx b/web/src/components/AttachmentLibrary/AttachmentLibraryPrimitives.tsx
index 854e1b84..b0015bbc 100644
--- a/web/src/components/AttachmentLibrary/AttachmentLibraryPrimitives.tsx
+++ b/web/src/components/AttachmentLibrary/AttachmentLibraryPrimitives.tsx
@@ -63,7 +63,7 @@ export const AttachmentSourceChip = ({
   return (
     <Link
       to={`/${memoName}`}
-      state={createMemoNavigationState(`${location.pathname}${location.search}`, "preserve")}
+      state={createMemoNavigationState(`${location.pathname}${location.search}`)}
       className="inline-flex max-w-full items-center truncate rounded-full border border-border/60 bg-muted/30 px-1.5 py-0.5 text-[11px] text-muted-foreground hover:bg-muted/50"
     >
       <span className="truncate">{t("attachment-library.labels.memo")}</span>
diff --git a/web/src/components/MemoCommentSection.tsx b/web/src/components/MemoCommentSection.tsx
index 6bfe6842..5d028763 100644
--- a/web/src/components/MemoCommentSection.tsx
+++ b/web/src/components/MemoCommentSection.tsx
@@ -3,7 +3,6 @@ import { type ComponentType, forwardRef, useCallback, useImperativeHandle, useRe
 import { loadMemoEditor } from "@/components/MemoEditor/loader";
 import type { MemoEditorProps } from "@/components/MemoEditor/types";
 import MemoView from "@/components/MemoView";
-import type { MemoOriginScope } from "@/components/MemoView/navigation";
 import { Button } from "@/components/ui/button";
 import useCurrentUser from "@/hooks/useCurrentUser";
 import { MEMO_COMMENTS_ANCHOR_ID } from "@/lib/memo-comments";
@@ -17,7 +16,6 @@ interface Props {
   comments: Memo[];
   commentCount?: number;
   parentPage?: string;
-  parentScope?: MemoOriginScope;
   hasMoreComments?: boolean;
   isFetchingMoreComments?: boolean;
   onLoadMoreComments?: () => void;
@@ -29,19 +27,7 @@ export interface MemoCommentSectionHandle {
 }
 
 const MemoCommentSection = forwardRef<MemoCommentSectionHandle, Props>(
-  (
-    {
-      memo,
-      comments,
-      commentCount = comments.length,
-      parentPage,
-      parentScope,
-      hasMoreComments,
-      isFetchingMoreComments,
-      onLoadMoreComments,
-    },
-    ref,
-  ) => {
+  ({ memo, comments, commentCount = comments.length, parentPage, hasMoreComments, isFetchingMoreComments, onLoadMoreComments }, ref) => {
     const t = useTranslate();
     const currentUser = useCurrentUser();
     const [showEditor, setShowEditor] = useState(false);
@@ -154,7 +140,7 @@ const MemoCommentSection = forwardRef<MemoCommentSectionHandle, Props>(
           )}
           {comments.map((comment) => (
             <div className="w-full" key={comment.name} id={extractMemoIdFromName(comment.name)}>
-              <MemoView memo={comment} parentPage={parentPage} parentScope={parentScope} showCreator showSpace compact />
+              <MemoView memo={comment} parentPage={parentPage} showCreator showSpace compact />
             </div>
           ))}
           {hasMoreComments && (
diff --git a/web/src/components/MemoContent/MemoMarkdownRenderer.tsx b/web/src/components/MemoContent/MemoMarkdownRenderer.tsx
index ec456e54..44486c74 100644
--- a/web/src/components/MemoContent/MemoMarkdownRenderer.tsx
+++ b/web/src/components/MemoContent/MemoMarkdownRenderer.tsx
@@ -7,7 +7,6 @@ import { isMentionElement, isTagElement, isTaskListItemElement } from "@/types/m
 import type { Attachment } from "@/types/proto/api/v1/attachment_service_pb";
 import { lazyWithReload } from "@/utils/lazy";
 import { resolveManagedAttachmentImageSource } from "@/utils/managed-attachment";
-import type { MemoOriginScope } from "../MemoView/navigation";
 import { CodeBlock } from "./CodeBlock";
 import { MarkdownRenderContext, rootMarkdownRenderContext } from "./MarkdownRenderContext";
 import { Mention } from "./Mention";
@@ -26,7 +25,6 @@ export interface MemoMarkdownRendererProps {
   memoName?: string;
   /** Collection page that opened the memo detail. */
   parentPage?: string;
-  parentScope?: MemoOriginScope;
   /** Whether the memo is rendered as a collapsed feed card. */
   compact?: boolean;
 }
@@ -67,7 +65,6 @@ export const MemoMarkdownRendererCore = ({
   resolvedMentionUsernames,
   memoName,
   parentPage,
-  parentScope,
   compact,
   mathRemarkPlugins = [],
   mathRehypePlugins = [],
@@ -134,7 +131,7 @@ export const MemoMarkdownRendererCore = ({
       // than opening a new tab; everything else is treated as an external link.
       if (typeof href === "string" && href.startsWith("#")) {
         return (
-          <AnchorLink href={href} memoName={memoName} parentPage={parentPage} parentScope={parentScope} compact={compact} {...props}>
+          <AnchorLink href={href} memoName={memoName} parentPage={parentPage} compact={compact} {...props}>
             {children}
           </AnchorLink>
         );
@@ -195,7 +192,6 @@ export const MemoMarkdownRenderer = memo(
     previous.attachments === next.attachments &&
     previous.memoName === next.memoName &&
     previous.parentPage === next.parentPage &&
-    previous.parentScope === next.parentScope &&
     previous.compact === next.compact &&
     haveEqualResolvedMentions(previous.resolvedMentionUsernames, next.resolvedMentionUsernames),
 );
diff --git a/web/src/components/MemoContent/index.tsx b/web/src/components/MemoContent/index.tsx
index a28192a3..740c5543 100644
--- a/web/src/components/MemoContent/index.tsx
+++ b/web/src/components/MemoContent/index.tsx
@@ -40,7 +40,6 @@ const MemoContent = (props: MemoContentProps) => {
           resolvedMentionUsernames={resolvedMentionUsernames}
           memoName={props.memoName}
           parentPage={props.parentPage}
-          parentScope={props.parentScope}
           compact={Boolean(props.compact)}
         />
       </div>
diff --git a/web/src/components/MemoContent/markdown/AnchorLink.tsx b/web/src/components/MemoContent/markdown/AnchorLink.tsx
index 75be8db4..b4cd27d2 100644
--- a/web/src/components/MemoContent/markdown/AnchorLink.tsx
+++ b/web/src/components/MemoContent/markdown/AnchorLink.tsx
@@ -2,7 +2,7 @@ import { Link } from "react-router-dom";
 import { markdownStyles } from "@/lib/markdownStyles";
 import { cn } from "@/lib/utils";
 import { findAnchorTarget } from "@/utils/markdown-manipulation";
-import { createMemoNavigationState, type MemoOriginScope } from "../../MemoView/navigation";
+import { createMemoNavigationState } from "../../MemoView/navigation";
 import type { ReactMarkdownProps } from "./types";
 
 interface AnchorLinkProps extends React.AnchorHTMLAttributes<HTMLAnchorElement>, ReactMarkdownProps {
@@ -11,7 +11,6 @@ interface AnchorLinkProps extends React.AnchorHTMLAttributes<HTMLAnchorElement>,
   memoName?: string;
   /** Collection page that rendered the enclosing memo. */
   parentPage?: string;
-  parentScope?: MemoOriginScope;
   /** Whether the memo is rendered as a collapsed feed card. */
   compact?: boolean;
   children: React.ReactNode;
@@ -26,17 +25,7 @@ interface AnchorLinkProps extends React.AnchorHTMLAttributes<HTMLAnchorElement>,
  * below the fold, so we fall back to navigating to the memo detail page (with the hash), where
  * MemoDetail scrolls the target into view.
  */
-export const AnchorLink = ({
-  href,
-  memoName,
-  parentPage,
-  parentScope,
-  compact,
-  children,
-  className,
-  node: _node,
-  ...props
-}: AnchorLinkProps) => {
+export const AnchorLink = ({ href, memoName, parentPage, compact, children, className, node: _node, ...props }: AnchorLinkProps) => {
   const handleClick = (event: React.MouseEvent<HTMLAnchorElement>) => {
     if (compact) return; // Let the link navigate to the detail page.
     const id = decodeURIComponent(href.slice(1));
@@ -57,7 +46,7 @@ export const AnchorLink = ({
     return (
       <Link
         to={`/${memoName}${href}`}
-        state={parentPage && parentScope ? createMemoNavigationState(parentPage, parentScope) : undefined}
+        state={parentPage ? createMemoNavigationState(parentPage) : undefined}
         onClick={handleClick}
         className={classes}
         {...props}
diff --git a/web/src/components/MemoContent/types.ts b/web/src/components/MemoContent/types.ts
index 4de996e7..3e7fa0d7 100644
--- a/web/src/components/MemoContent/types.ts
+++ b/web/src/components/MemoContent/types.ts
@@ -1,6 +1,5 @@
 import type React from "react";
 import type { Attachment } from "@/types/proto/api/v1/attachment_service_pb";
-import type { MemoOriginScope } from "../MemoView/navigation";
 
 export interface MemoContentProps {
   content: string;
@@ -10,7 +9,6 @@ export interface MemoContentProps {
   memoName?: string;
   /** Collection page that rendered the memo, preserved when an inline link opens its detail page. */
   parentPage?: string;
-  parentScope?: MemoOriginScope;
   /** The card renders collapsed (ClampedSection), so footnote links navigate instead of scrolling. */
   compact?: boolean;
   className?: string;
diff --git a/web/src/components/MemoDetailSidebar/MemoDetailSidebar.tsx b/web/src/components/MemoDetailSidebar/MemoDetailSidebar.tsx
index 17fc5d30..95e8eaca 100644
--- a/web/src/components/MemoDetailSidebar/MemoDetailSidebar.tsx
+++ b/web/src/components/MemoDetailSidebar/MemoDetailSidebar.tsx
@@ -19,7 +19,7 @@ import SidebarSection, { SIDEBAR_SECTION_STACK_CLASSES } from "@/components/AppS
 import { extractHeadings } from "@/components/MemoContent/pipeline";
 import { getRelationBuckets, getRelationMemo } from "@/components/MemoMetadata/Relation/relationHelpers";
 import { useResolvedRelationMemos } from "@/components/MemoMetadata/Relation/useResolvedRelationMemos";
-import { createMemoNavigationState, type MemoOriginScope } from "@/components/MemoView/navigation";
+import { createMemoNavigationState } from "@/components/MemoView/navigation";
 import { DropdownMenu, DropdownMenuContent, DropdownMenuItem, DropdownMenuTrigger } from "@/components/ui/dropdown-menu";
 import { useInstance } from "@/contexts/InstanceContext";
 import { useOverflowTitle } from "@/hooks";
@@ -37,7 +37,6 @@ interface Props {
   memo: Memo;
   parentMemo?: Memo;
   parentPage?: string;
-  parentScope?: MemoOriginScope;
   hasExplicitOrigin?: boolean;
   commentCount?: number;
   className?: string;
@@ -54,13 +53,11 @@ const BacklinkRow = ({
   relation,
   snippet,
   parentPage,
-  parentScope,
   referencedByLabel,
 }: {
   relation: MemoRelation;
   snippet: string;
   parentPage?: string;
-  parentScope?: MemoOriginScope;
   referencedByLabel: string;
 }) => {
   const { ref, title } = useOverflowTitle<HTMLSpanElement>(snippet);
@@ -74,7 +71,7 @@ const BacklinkRow = ({
       aria-label={`${referencedByLabel}: ${snippet}`}
       className={cn(SIDEBAR_ROW_CLASSES, "text-muted-foreground hover:bg-sidebar-accent/65 hover:text-foreground")}
       to={`/${relatedMemo.name}`}
-      state={parentPage && parentScope ? createMemoNavigationState(parentPage, parentScope) : undefined}
+      state={parentPage ? createMemoNavigationState(parentPage) : undefined}
       title={title}
       viewTransition
     >
@@ -90,7 +87,6 @@ const MemoDetailSidebar = ({
   memo,
   parentMemo,
   parentPage,
-  parentScope,
   hasExplicitOrigin = false,
   commentCount,
   className,
@@ -219,7 +215,7 @@ const MemoDetailSidebar = ({
               aria-label={`${t("memo.parent-memo")}: ${parentSnippet}`}
               className={cn(SIDEBAR_ROW_CLASSES, "text-muted-foreground hover:bg-sidebar-accent/65 hover:text-foreground")}
               to={`/${parentMemo.name}`}
-              state={parentPage && parentScope ? createMemoNavigationState(parentPage, parentScope) : undefined}
+              state={parentPage ? createMemoNavigationState(parentPage) : undefined}
               title={parentSnippet}
               viewTransition
             >
@@ -235,7 +231,6 @@ const MemoDetailSidebar = ({
                 relation={relation}
                 snippet={backlinkSnippet(relation)}
                 parentPage={parentPage}
-                parentScope={parentScope}
                 referencedByLabel={t("common.referenced-by")}
               />
             );
diff --git a/web/src/components/MemoMetadata/Relation/RelationCard.tsx b/web/src/components/MemoMetadata/Relation/RelationCard.tsx
index 83cb6d27..4cfeba9f 100644
--- a/web/src/components/MemoMetadata/Relation/RelationCard.tsx
+++ b/web/src/components/MemoMetadata/Relation/RelationCard.tsx
@@ -1,21 +1,20 @@
 import MemoSnippetLink from "@/components/MemoView/components/MemoSnippetLink";
-import { createMemoNavigationState, type MemoOriginScope } from "@/components/MemoView/navigation";
+import { createMemoNavigationState } from "@/components/MemoView/navigation";
 import type { MemoRelation_Memo } from "@/types/proto/api/v1/memo_service_pb";
 
 interface RelationCardProps {
   memo: MemoRelation_Memo;
   parentPage?: string;
-  parentScope?: MemoOriginScope;
   className?: string;
 }
 
-const RelationCard = ({ memo, parentPage, parentScope, className }: RelationCardProps) => {
+const RelationCard = ({ memo, parentPage, className }: RelationCardProps) => {
   return (
     <MemoSnippetLink
       name={memo.name}
       snippet={memo.snippet}
       to={`/${memo.name}`}
-      state={parentPage && parentScope ? createMemoNavigationState(parentPage, parentScope) : undefined}
+      state={parentPage ? createMemoNavigationState(parentPage) : undefined}
       className={className}
     />
   );
diff --git a/web/src/components/MemoMetadata/Relation/RelationListView.tsx b/web/src/components/MemoMetadata/Relation/RelationListView.tsx
index 1e1c7e3e..3030080c 100644
--- a/web/src/components/MemoMetadata/Relation/RelationListView.tsx
+++ b/web/src/components/MemoMetadata/Relation/RelationListView.tsx
@@ -1,7 +1,6 @@
 import { LinkIcon, MilestoneIcon } from "lucide-react";
 import { useMemo, useState } from "react";
 import MetadataSection from "@/components/MemoMetadata/MetadataSection";
-import type { MemoOriginScope } from "@/components/MemoView/navigation";
 import { useNearViewport } from "@/hooks/useNearViewport";
 import type { MemoRelation } from "@/types/proto/api/v1/memo_service_pb";
 import { useTranslate } from "@/utils/i18n";
@@ -13,11 +12,10 @@ interface RelationListViewProps {
   relations: MemoRelation[];
   currentMemoName?: string;
   parentPage?: string;
-  parentScope?: MemoOriginScope;
   className?: string;
 }
 
-function RelationListView({ relations, currentMemoName, parentPage, parentScope, className }: RelationListViewProps) {
+function RelationListView({ relations, currentMemoName, parentPage, className }: RelationListViewProps) {
   const t = useTranslate();
   const [activeTab, setActiveTab] = useState<"referencing" | "referenced">("referencing");
   const { ref: viewportRef, isNearViewport } = useNearViewport<HTMLDivElement>();
@@ -81,12 +79,7 @@ function RelationListView({ relations, currentMemoName, parentPage, parentScope,
           return null;
         }
         return (
-          <RelationCard
-            key={getRelationMemoName(relation, direction)}
-            memo={resolvedMemos[memo.name] ?? memo}
-            parentPage={parentPage}
-            parentScope={parentScope}
-          />
+          <RelationCard key={getRelationMemoName(relation, direction)} memo={resolvedMemos[memo.name] ?? memo} parentPage={parentPage} />
         );
       })}
     </MetadataSection>
diff --git a/web/src/components/MemoPreview/MemoPreview.tsx b/web/src/components/MemoPreview/MemoPreview.tsx
index 279c420b..2663071e 100644
--- a/web/src/components/MemoPreview/MemoPreview.tsx
+++ b/web/src/components/MemoPreview/MemoPreview.tsx
@@ -29,7 +29,6 @@ const STUB_CONTEXT: MemoViewContextValue = {
   creator: undefined,
   currentUser: undefined,
   parentPage: "/",
-  parentScope: "all",
   cardWidth: 0,
   isArchived: false,
   readonly: true,
diff --git a/web/src/components/MemoView/MemoView.tsx b/web/src/components/MemoView/MemoView.tsx
index af1ae51e..e9904f7a 100644
--- a/web/src/components/MemoView/MemoView.tsx
+++ b/web/src/components/MemoView/MemoView.tsx
@@ -25,7 +25,7 @@ import { MemoBody, MemoCommentListView, MemoHeader } from "./components";
 import { MEMO_CARD_BASE_CLASSES } from "./constants";
 import { useImagePreview } from "./hooks";
 import { computeCommentAmount, MemoViewContext } from "./MemoViewContext";
-import { isMemoDetailPath, resolveMemoOrigin } from "./navigation";
+import { isMemoDetailPath, resolveMemoParentPage } from "./navigation";
 import type { MemoViewHandle, MemoViewProps } from "./types";
 
 const MemoShareImageDialog = lazyWithReload(() => import("../MemoActionMenu/MemoShareImageDialog"));
@@ -36,7 +36,6 @@ const MemoView = forwardRef<MemoViewHandle, MemoViewProps>((props, ref) => {
     memo: memoData,
     className,
     parentPage: parentPageProp,
-    parentScope: parentScopeProp,
     compact,
     timeDisplay,
     showCreator,
@@ -55,9 +54,8 @@ const MemoView = forwardRef<MemoViewHandle, MemoViewProps>((props, ref) => {
   const isArchived = memoData.state === State.ARCHIVED;
   const readonly = memoData.creator !== currentUser?.name && !isSuperUser(currentUser);
   const location = useLocation();
-  const { parentPage, parentScope } = resolveMemoOrigin({
+  const parentPage = resolveMemoParentPage({
     explicitParentPage: parentPageProp,
-    explicitParentScope: parentScopeProp,
     pathname: location.pathname,
     search: location.search,
     memoName: memoData.name,
@@ -135,7 +133,6 @@ const MemoView = forwardRef<MemoViewHandle, MemoViewProps>((props, ref) => {
       creator,
       currentUser,
       parentPage,
-      parentScope,
       cardWidth,
       isArchived,
       readonly,
@@ -150,7 +147,6 @@ const MemoView = forwardRef<MemoViewHandle, MemoViewProps>((props, ref) => {
       creator,
       currentUser,
       parentPage,
-      parentScope,
       cardWidth,
       isArchived,
       readonly,
diff --git a/web/src/components/MemoView/MemoViewContext.tsx b/web/src/components/MemoView/MemoViewContext.tsx
index f682b1d6..432692f7 100644
--- a/web/src/components/MemoView/MemoViewContext.tsx
+++ b/web/src/components/MemoView/MemoViewContext.tsx
@@ -7,14 +7,13 @@ import { MemoRelation_Type } from "@/types/proto/api/v1/memo_service_pb";
 import type { User } from "@/types/proto/api/v1/user_service_pb";
 import type { PreviewMediaItem } from "@/utils/media-item";
 import { RELATIVE_TIME_THRESHOLD_MS } from "./constants";
-import { isMemoDetailPath, type MemoOriginScope } from "./navigation";
+import { isMemoDetailPath } from "./navigation";
 
 export interface MemoViewContextValue {
   memo: Memo;
   creator: User | undefined;
   currentUser: User | undefined;
   parentPage: string;
-  parentScope: MemoOriginScope;
   cardWidth: number;
   isArchived: boolean;
   readonly: boolean;
diff --git a/web/src/components/MemoView/components/MemoBody.tsx b/web/src/components/MemoView/components/MemoBody.tsx
index c73ee458..ccd05fe2 100644
--- a/web/src/components/MemoView/components/MemoBody.tsx
+++ b/web/src/components/MemoView/components/MemoBody.tsx
@@ -32,8 +32,7 @@ const BlurOverlay: React.FC<{ onClick?: () => void }> = ({ onClick }) => {
 };
 
 const MemoBody: React.FC<MemoBodyProps> = ({ compact }) => {
-  const { memo, parentPage, parentScope, showBlurredContent, blurred, readonly, openEditor, openPreview, toggleBlurVisibility } =
-    useMemoViewContext();
+  const { memo, parentPage, showBlurredContent, blurred, readonly, openEditor, openPreview, toggleBlurVisibility } = useMemoViewContext();
 
   const { handleMemoContentClick, handleMemoContentDoubleClick } = useMemoHandlers({ readonly, openEditor, openPreview });
 
@@ -58,7 +57,6 @@ const MemoBody: React.FC<MemoBodyProps> = ({ compact }) => {
           <MemoContent
             memoName={memo.name}
             parentPage={parentPage}
-            parentScope={parentScope}
             content={memo.content}
             attachments={memo.attachments}
             onClick={handleMemoContentClick}
@@ -66,7 +64,7 @@ const MemoBody: React.FC<MemoBodyProps> = ({ compact }) => {
             compact={Boolean(compact)}
           />
           <AttachmentListView attachments={attachmentOnlyItems} onImagePreview={openPreview} />
-          <RelationListView relations={referencedMemos} currentMemoName={memo.name} parentPage={parentPage} parentScope={parentScope} />
+          <RelationListView relations={referencedMemos} currentMemoName={memo.name} parentPage={parentPage} />
           {memo.location && <LocationDisplayView location={memo.location} />}
         </ClampedSection>
         <MemoReactionListView memo={memo} reactions={memo.reactions} />
diff --git a/web/src/components/MemoView/components/MemoCommentListView.tsx b/web/src/components/MemoView/components/MemoCommentListView.tsx
index 5b06b0b6..0e6f900b 100644
--- a/web/src/components/MemoView/components/MemoCommentListView.tsx
+++ b/web/src/components/MemoView/components/MemoCommentListView.tsx
@@ -10,7 +10,7 @@ import { useMemoViewContext, useMemoViewDerived } from "../MemoViewContext";
 import { createMemoNavigationState } from "../navigation";
 
 const MemoCommentListView: React.FC = () => {
-  const { memo, parentPage, parentScope } = useMemoViewContext();
+  const { memo, parentPage } = useMemoViewContext();
   const { isInMemoDetailPage, commentAmount } = useMemoViewDerived();
   const { ref: viewportRef, isNearViewport } = useNearViewport<HTMLDivElement>();
 
@@ -32,7 +32,7 @@ const MemoCommentListView: React.FC = () => {
         <span className="text-xs text-muted-foreground">Comments{commentAmount > 1 ? ` (${commentAmount})` : ""}</span>
         <Link
           to={`/${memo.name}#${MEMO_COMMENTS_ANCHOR_ID}`}
-          state={createMemoNavigationState(parentPage, parentScope)}
+          state={createMemoNavigationState(parentPage)}
           className="flex items-center gap-0.5 text-xs text-muted-foreground/80 hover:underline underline-offset-2 transition-colors"
         >
           View all
@@ -46,7 +46,7 @@ const MemoCommentListView: React.FC = () => {
           <Link
             key={comment.name}
             to={`/${memo.name}#${uid}`}
-            state={createMemoNavigationState(parentPage, parentScope)}
+            state={createMemoNavigationState(parentPage)}
             viewTransition
             className="rounded-md bg-muted/40 px-2 py-1 transition-colors hover:bg-muted/60"
           >
diff --git a/web/src/components/MemoView/components/MemoHeader.tsx b/web/src/components/MemoView/components/MemoHeader.tsx
index ca7abe08..7cbf3f29 100644
--- a/web/src/components/MemoView/components/MemoHeader.tsx
+++ b/web/src/components/MemoView/components/MemoHeader.tsx
@@ -29,15 +29,15 @@ const MemoHeader: React.FC<MemoHeaderProps> = ({ timeDisplay = "relative", showC
   const t = useTranslate();
   const [reactionSelectorOpen, setReactionSelectorOpen] = useState(false);
 
-  const { memo, creator, currentUser, parentPage, parentScope, isArchived, readonly, openEditor } = useMemoViewContext();
+  const { memo, creator, currentUser, parentPage, isArchived, readonly, openEditor } = useMemoViewContext();
   const { createTime, updateTime, displayTime: memoDisplayTime, isDisplayingUpdatedTime, relativeTimeFormat } = useMemoViewDerived();
   const { newMemoName } = useNewMemo();
   const visibilityOption = getVisibilityOption(memo.visibility);
 
   const navigateTo = useNavigateTo();
   const handleGotoMemoDetailPage = useCallback(() => {
-    navigateTo(`/${memo.name}`, { state: createMemoNavigationState(parentPage, parentScope) });
-  }, [memo.name, parentPage, parentScope, navigateTo]);
+    navigateTo(`/${memo.name}`, { state: createMemoNavigationState(parentPage) });
+  }, [memo.name, parentPage, navigateTo]);
 
   const { unpinMemo } = useMemoActions(memo);
 
diff --git a/web/src/components/MemoView/navigation.ts b/web/src/components/MemoView/navigation.ts
index be0a9931..9cf8ce45 100644
--- a/web/src/components/MemoView/navigation.ts
+++ b/web/src/components/MemoView/navigation.ts
@@ -1,11 +1,8 @@
-import { getProfileUsername, isMemoScopeRoute } from "@/lib/memo-views";
-import { ROUTES, resolveCollectionRoute } from "@/router/routes";
-
-export type MemoOriginScope = "all" | "preserve";
+import { getProfileUsername } from "@/lib/memo-views";
+import { ROUTES } from "@/router/routes";
 
 export interface MemoNavigationState {
   from: string;
-  fromScope: MemoOriginScope;
 }
 
 interface ResolveMemoDetailOriginOptions {
@@ -14,7 +11,6 @@ interface ResolveMemoDetailOriginOptions {
 
 interface ResolveMemoParentPageOptions {
   explicitParentPage?: string;
-  explicitParentScope?: MemoOriginScope;
   pathname: string;
   search: string;
   memoName: string;
@@ -40,32 +36,13 @@ export const isMemoResourcePath = (pathname: string): boolean => {
   return memoID.length > 0 && !memoID.includes("/");
 };
 
-/** Whether this origin represents a collection whose complete URL should be preserved. */
-export const isMemoCollectionOrigin = (page: string): boolean => {
-  const pathname = page.split(/[?#]/, 1)[0] || ROUTES.HOME;
-  return isMemoScopeRoute(pathname) || resolveCollectionRoute(pathname).isCollection;
-};
+export const createMemoNavigationState = (from: string): MemoNavigationState => ({ from });
 
-export const createMemoNavigationState = (from: string, fromScope: MemoOriginScope): MemoNavigationState => ({ from, fromScope });
-
-/** Reads router state while remaining compatible with older `{ from }` links. */
-export const resolveMemoDetailOrigin = (
-  state: unknown,
-  options: ResolveMemoDetailOriginOptions = {},
-): { parentPage: string; parentScope: MemoOriginScope } => {
-  const value = state && typeof state === "object" ? (state as { from?: unknown; fromScope?: unknown }) : undefined;
+/** Reads the origin page out of router state; without one, a detail returns to its collection. */
+export const resolveMemoDetailOrigin = (state: unknown, options: ResolveMemoDetailOriginOptions = {}): string => {
+  const value = state && typeof state === "object" ? (state as { from?: unknown }) : undefined;
   const explicitParentPage = typeof value?.from === "string" ? value.from : undefined;
-  const hasExplicitParent = explicitParentPage !== undefined;
-  const parentPage = explicitParentPage || (options.memoArchived ? ROUTES.ARCHIVED : ROUTES.HOME);
-  const parentScope =
-    value?.fromScope === "all" || value?.fromScope === "preserve"
-      ? value.fromScope
-      : hasExplicitParent && isMemoCollectionOrigin(parentPage)
-        ? "preserve"
-        : options.memoArchived
-          ? "preserve"
-          : "all";
-  return { parentPage, parentScope };
+  return explicitParentPage || (options.memoArchived ? ROUTES.ARCHIVED : ROUTES.HOME);
 };
 
 /** Whether the current route is the canonical detail page for this memo. */
@@ -79,33 +56,12 @@ export const isMemoDetailPath = (pathname: string, memoName: string): boolean =>
  * Captures the list page that opened a memo so canonical detail routes can
  * return to the real collection lens instead of assuming Home.
  */
-export const resolveMemoOrigin = ({
-  explicitParentPage,
-  explicitParentScope,
-  pathname,
-  search,
-  memoName,
-}: ResolveMemoParentPageOptions): { parentPage: string; parentScope: MemoOriginScope } => {
-  if (explicitParentPage !== undefined) {
-    const parentPage = explicitParentPage || ROUTES.HOME;
-    return {
-      parentPage,
-      parentScope: explicitParentScope ?? (isMemoCollectionOrigin(parentPage) ? "preserve" : "all"),
-    };
-  }
-
-  if (isMemoDetailPath(pathname, memoName)) {
-    return { parentPage: ROUTES.HOME, parentScope: "all" };
-  }
-
-  return {
-    parentPage: `${pathname}${search}`,
-    parentScope: isMemoCollectionOrigin(pathname) ? "preserve" : "all",
-  };
+export const resolveMemoParentPage = ({ explicitParentPage, pathname, search, memoName }: ResolveMemoParentPageOptions): string => {
+  if (explicitParentPage !== undefined) return explicitParentPage || ROUTES.HOME;
+  if (isMemoDetailPath(pathname, memoName)) return ROUTES.HOME;
+  return `${pathname}${search}`;
 };
 
-export const resolveMemoParentPage = (options: ResolveMemoParentPageOptions): string => resolveMemoOrigin(options).parentPage;
-
 /** Replaces only the memo filter while preserving the rest of the origin query. */
 export const withMemoFilter = (page: string, filter: string): string => {
   const [pathAndSearch] = page.split("#", 1);
diff --git a/web/src/components/MemoView/types.ts b/web/src/components/MemoView/types.ts
index 4857ebbe..487b992f 100644
--- a/web/src/components/MemoView/types.ts
+++ b/web/src/components/MemoView/types.ts
@@ -1,5 +1,4 @@
 import type { Memo } from "@/types/proto/api/v1/memo_service_pb";
-import type { MemoOriginScope } from "./navigation";
 
 /** How the header names the memo's time: relative to now, or just the clock time for lists that already name the day. */
 export type MemoTimeDisplay = "relative" | "time";
@@ -14,7 +13,6 @@ export interface MemoViewProps {
   showSpace?: boolean;
   className?: string;
   parentPage?: string;
-  parentScope?: MemoOriginScope;
   shareImageDialogOpen?: boolean;
   onShareImageDialogOpenChange?: (open: boolean) => void;
 }
diff --git a/web/src/components/UserMemoMap/UserMemoMap.tsx b/web/src/components/UserMemoMap/UserMemoMap.tsx
index 857913c9..a14467d6 100644
--- a/web/src/components/UserMemoMap/UserMemoMap.tsx
+++ b/web/src/components/UserMemoMap/UserMemoMap.tsx
@@ -157,7 +157,7 @@ const UserMemoMap = ({ creator, className }: Props) => {
                     </div>
                     <Link
                       to={`/memos/${memo.name.split("/").pop()}`}
-                      state={createMemoNavigationState(parentPage, "all")}
+                      state={createMemoNavigationState(parentPage)}
                       className="inline-flex items-center gap-1 rounded-full border border-border bg-background px-2.5 py-1 text-[11px] font-medium text-foreground transition-all hover:border-primary/40 hover:text-primary"
                     >
                       Open
diff --git a/web/src/contexts/AppSidebarContext.tsx b/web/src/contexts/AppSidebarContext.tsx
index 9cb25f3c..64213502 100644
--- a/web/src/contexts/AppSidebarContext.tsx
+++ b/web/src/contexts/AppSidebarContext.tsx
@@ -1,6 +1,5 @@
 import { createContext, type ReactNode, useCallback, useContext, useEffect, useMemo, useRef, useState } from "react";
 import { useLocation } from "react-router-dom";
-import type { MemoOriginScope } from "@/components/MemoView/navigation";
 import type { PrimaryMemoScope } from "@/lib/memo-views";
 import type { Memo } from "@/types/proto/api/v1/memo_service_pb";
 
@@ -11,7 +10,6 @@ export interface MemoDetailSidebarDescriptor {
   memo: Memo;
   parentMemo?: Memo;
   from?: string;
-  fromScope?: MemoOriginScope;
   hasExplicitOrigin?: boolean;
   commentCount?: number;
   readonly?: boolean;
diff --git a/web/src/lib/memo-views.ts b/web/src/lib/memo-views.ts
index d162fcc1..52c31ea6 100644
--- a/web/src/lib/memo-views.ts
+++ b/web/src/lib/memo-views.ts
@@ -41,8 +41,6 @@ export const isCalendarRoute = (pathname: string): boolean => {
 /**
  * Routes that render a memo collection the sidebar can narrow: the scope routes, a user
  * profile and the calendar. Views, calendar days and tags apply in place on all of them.
- * This is a different question from `isMemoCollectionOrigin` (MemoView/navigation.ts),
- * which asks whether a memo origin is a collection whose full URL is worth returning to.
  */
 export const isMemoCollectionRoute = (pathname: string): boolean =>
   isMemoScopeRoute(pathname) || getProfileUsername(pathname) !== undefined || isCalendarRoute(pathname);
diff --git a/web/src/pages/MemoDetail.tsx b/web/src/pages/MemoDetail.tsx
index 630e4db0..9a569f4a 100644
--- a/web/src/pages/MemoDetail.tsx
+++ b/web/src/pages/MemoDetail.tsx
@@ -6,7 +6,7 @@ import MemoCommentSection, { type MemoCommentSectionHandle } from "@/components/
 import { MentionResolutionProvider } from "@/components/MemoContent/MentionResolutionContext";
 import MemoView, { type MemoViewHandle } from "@/components/MemoView";
 import { computeCommentAmount } from "@/components/MemoView/MemoViewContext";
-import { createMemoNavigationState, type MemoOriginScope, resolveMemoDetailOrigin } from "@/components/MemoView/navigation";
+import { createMemoNavigationState, resolveMemoDetailOrigin } from "@/components/MemoView/navigation";
 import { useAppSidebar } from "@/contexts/AppSidebarContext";
 import { useAuth } from "@/contexts/AuthContext";
 import { useInstance } from "@/contexts/InstanceContext";
@@ -25,7 +25,6 @@ const MemoSidebarRegistration = ({
   memo,
   parentMemo,
   from,
-  fromScope,
   hasExplicitOrigin,
   commentCount,
   readonly,
@@ -37,7 +36,6 @@ const MemoSidebarRegistration = ({
   memo: Memo;
   parentMemo?: Memo;
   from: string;
-  fromScope: MemoOriginScope;
   hasExplicitOrigin: boolean;
   commentCount?: number;
   readonly: boolean;
@@ -53,7 +51,6 @@ const MemoSidebarRegistration = ({
       memo,
       parentMemo,
       from,
-      fromScope,
       hasExplicitOrigin,
       commentCount,
       readonly,
@@ -65,7 +62,6 @@ const MemoSidebarRegistration = ({
   }, [
     commentCount,
     from,
-    fromScope,
     hasExplicitOrigin,
     memo,
     onCommentCreate,
@@ -113,8 +109,7 @@ const MemoDetail = () => {
   const hasExplicitOrigin =
     !!locationState && typeof locationState === "object" && typeof (locationState as { from?: unknown }).from === "string";
   const resolvedOrigin = resolveMemoDetailOrigin(locationState, { memoArchived: memo?.state === State.ARCHIVED });
-  const parentPage = !hasExplicitOrigin && !currentUser && memo?.state !== State.ARCHIVED ? ROUTES.EXPLORE : resolvedOrigin.parentPage;
-  const parentScope = resolvedOrigin.parentScope;
+  const parentPage = !hasExplicitOrigin && !currentUser && memo?.state !== State.ARCHIVED ? ROUTES.EXPLORE : resolvedOrigin;
   const memoName = memo?.name ?? memoNameFromParams;
   const displayMemo = useReactMemo(() => {
     if (!memo) return undefined;
@@ -197,7 +192,6 @@ const MemoDetail = () => {
           memo={displayMemo}
           parentMemo={parentMemo}
           from={parentPage}
-          fromScope={parentScope}
           hasExplicitOrigin={hasExplicitOrigin}
           commentCount={isShareMode ? undefined : commentCount}
           readonly={isShareMode}
@@ -213,7 +207,7 @@ const MemoDetail = () => {
                 <Link
                   className="px-3 py-1 border border-border rounded-lg max-w-xs w-auto text-sm flex flex-row justify-start items-center flex-nowrap text-muted-foreground hover:shadow hover:opacity-80"
                   to={`/${parentMemo.name}`}
-                  state={createMemoNavigationState(parentPage, parentScope)}
+                  state={createMemoNavigationState(parentPage)}
                   viewTransition
                 >
                   <ArrowUpLeftFromCircleIcon className="w-4 h-auto shrink-0 opacity-60 mr-2" />
@@ -227,7 +221,6 @@ const MemoDetail = () => {
               memo={displayMemo}
               compact={false}
               parentPage={parentPage}
-              parentScope={parentScope}
               shareImageDialogOpen={shareImageDialogOpen}
               showCreator
               showVisibility
@@ -242,7 +235,6 @@ const MemoDetail = () => {
                 comments={comments}
                 commentCount={commentCount}
                 parentPage={parentPage}
-                parentScope={parentScope}
                 hasMoreComments={hasNextComments}
                 isFetchingMoreComments={isFetchingNextComments}
                 onLoadMoreComments={fetchNextComments}
diff --git a/web/tests/attachment-library-source-link.test.tsx b/web/tests/attachment-library-source-link.test.tsx
index 8af19305..884be2bf 100644
--- a/web/tests/attachment-library-source-link.test.tsx
+++ b/web/tests/attachment-library-source-link.test.tsx
@@ -67,9 +67,7 @@ describe("<AttachmentMediaGrid>", () => {
 
     fireEvent.click(memoLink);
     expect(onPreview).not.toHaveBeenCalled();
-    expect(screen.getByTestId("location-state")).toHaveTextContent(
-      '{"from":"/spaces/product/attachments?filter=tagSearch%3Awork","fromScope":"preserve"}',
-    );
+    expect(screen.getByTestId("location-state")).toHaveTextContent('{"from":"/spaces/product/attachments?filter=tagSearch%3Awork"}');
   });
 
   it("keeps video duration inside the existing play badge", () => {
diff --git a/web/tests/memo-content-footnotes.test.tsx b/web/tests/memo-content-footnotes.test.tsx
index a4db6103..eed1ede1 100644
--- a/web/tests/memo-content-footnotes.test.tsx
+++ b/web/tests/memo-content-footnotes.test.tsx
@@ -24,7 +24,6 @@ const renderFootnote = (compact = false, parentPage?: string) =>
           resolvedMentionUsernames={new Set()}
           memoName="memos/abc123"
           parentPage={parentPage}
-          parentScope={parentPage ? "preserve" : undefined}
           compact={compact}
         />
       </div>
diff --git a/web/tests/memo-detail-sidebar.test.tsx b/web/tests/memo-detail-sidebar.test.tsx
index 73bf6bf2..f9c2bdf0 100644
--- a/web/tests/memo-detail-sidebar.test.tsx
+++ b/web/tests/memo-detail-sidebar.test.tsx
@@ -83,7 +83,6 @@ describe("MemoDetailSidebar", () => {
         memo={memo}
         parentMemo={parentMemo}
         parentPage="/explore?filter=tagSearch%3Awork"
-        parentScope="preserve"
         hasExplicitOrigin
         commentCount={3}
         onEdit={onEdit}
@@ -144,9 +143,7 @@ describe("MemoDetailSidebar", () => {
       relations: [createIncomingReference("memos/public")],
     });
 
-    renderSidebar(
-      <MemoDetailSidebar memo={memo} parentPage="/explore" parentScope="all" commentCount={1} onEdit={vi.fn()} onCommentCreate={vi.fn()} />,
-    );
+    renderSidebar(<MemoDetailSidebar memo={memo} parentPage="/explore" commentCount={1} onEdit={vi.fn()} onCommentCreate={vi.fn()} />);
 
     expect(screen.queryByRole("button", { name: "common.edit" })).not.toBeInTheDocument();
     expect(screen.getByRole("button", { name: "memo.comment.write-a-comment" })).toBeInTheDocument();
@@ -163,9 +160,7 @@ describe("MemoDetailSidebar", () => {
       content: "Body",
     });
 
-    renderSidebar(
-      <MemoDetailSidebar memo={memo} parentPage="/" parentScope="all" commentCount={0} onEdit={vi.fn()} onCommentCreate={vi.fn()} />,
-    );
+    renderSidebar(<MemoDetailSidebar memo={memo} parentPage="/" commentCount={0} onEdit={vi.fn()} onCommentCreate={vi.fn()} />);
 
     expect(screen.getByRole("link", { name: "memo.go-to:common.home" })).toHaveAttribute("href", "/");
     expect(screen.queryByText("memo.on-this-memo")).not.toBeInTheDocument();
@@ -187,7 +182,7 @@ describe("MemoDetailSidebar", () => {
       content: "Body",
     });
 
-    renderSidebar(<MemoDetailSidebar memo={memo} parentPage="/" parentScope="all" commentCount={0} />);
+    renderSidebar(<MemoDetailSidebar memo={memo} parentPage="/" commentCount={0} />);
     fireEvent.click(screen.getByRole("button", { name: "common.share" }));
 
     expect(await screen.findByRole("menuitem", { name: "memo.copy-link" })).toBeInTheDocument();
@@ -202,16 +197,7 @@ describe("MemoDetailSidebar", () => {
       content: "Archived body",
     });
 
-    renderSidebar(
-      <MemoDetailSidebar
-        memo={memo}
-        parentPage="/archived"
-        parentScope="preserve"
-        commentCount={2}
-        onEdit={vi.fn()}
-        onCommentCreate={vi.fn()}
-      />,
-    );
+    renderSidebar(<MemoDetailSidebar memo={memo} parentPage="/archived" commentCount={2} onEdit={vi.fn()} onCommentCreate={vi.fn()} />);
 
     expect(screen.getByRole("link", { name: "memo.go-to:common.archived" })).toBeInTheDocument();
     expect(screen.getByRole("link", { name: /memo.comment.self/ })).toHaveTextContent("2");
@@ -237,7 +223,6 @@ describe("MemoDetailSidebar", () => {
         memo={memo}
         parentMemo={parentMemo}
         parentPage="/explore"
-        parentScope="all"
         hasExplicitOrigin
         commentCount={4}
         forceReadonly
diff --git a/web/tests/memo-filter-context.test.tsx b/web/tests/memo-filter-context.test.tsx
index a0d96283..9490ee28 100644
--- a/web/tests/memo-filter-context.test.tsx
+++ b/web/tests/memo-filter-context.test.tsx
@@ -81,7 +81,7 @@ describe("MemoFilterProvider", () => {
     );
     render(<RouterProvider router={router} />);
     fireEvent.click(screen.getByRole("button", { name: "Select Tasks" }));
-    const state = { from: origin, fromScope: "preserve" };
+    const state = { from: origin };
     await act(() => router.navigate("/memos/1", { state }));
     await waitFor(() => expect(screen.getByTestId("filters")).toHaveTextContent("[]"));
     expect(router.state.location.search).toBe("");
diff --git a/web/tests/memo-header-navigation.test.tsx b/web/tests/memo-header-navigation.test.tsx
index 04fd1f83..e0b83f00 100644
--- a/web/tests/memo-header-navigation.test.tsx
+++ b/web/tests/memo-header-navigation.test.tsx
@@ -62,7 +62,6 @@ vi.mock("@/components/MemoView/MemoViewContext", () => ({
     creator: state.creator,
     currentUser: state.currentUser,
     parentPage: "/explore?filter=tagSearch%3Awork",
-    parentScope: "preserve",
     isArchived: false,
     readonly: false,
     openEditor: vi.fn(),
@@ -142,9 +141,7 @@ describe("MemoHeader navigation", () => {
     expect(timestamp).toHaveFocus();
 
     fireEvent.click(timestamp);
-    expect(screen.getByTestId("location")).toHaveTextContent(
-      '/memos/123|{"from":"/explore?filter=tagSearch%3Awork","fromScope":"preserve"}',
-    );
+    expect(screen.getByTestId("location")).toHaveTextContent('/memos/123|{"from":"/explore?filter=tagSearch%3Awork"}');
   });
 
   it.each([false, true])("keeps the Space pill beside the timestamp when showCreator=%s", (showCreator) => {
diff --git a/web/tests/memo-view-navigation.test.ts b/web/tests/memo-view-navigation.test.ts
index c574ffc2..a0f9e162 100644
--- a/web/tests/memo-view-navigation.test.ts
+++ b/web/tests/memo-view-navigation.test.ts
@@ -1,11 +1,9 @@
 import { describe, expect, it } from "vitest";
 import {
   createMemoNavigationState,
-  isMemoCollectionOrigin,
   isMemoDetailPath,
   isMemoResourcePath,
   resolveMemoDetailOrigin,
-  resolveMemoOrigin,
   resolveMemoParentPage,
   withMemoFilter,
 } from "@/components/MemoView/navigation";
@@ -32,53 +30,25 @@ describe("memo view navigation", () => {
     ).toBe("/explore?filter=contentSearch%3Aroadmap");
   });
 
-  it("marks collection cards as preserving the remembered scope", () => {
-    expect(resolveMemoOrigin({ pathname: "/explore", search: "?filter=tagSearch%3Awork", memoName: "memos/123" })).toEqual({
-      parentPage: "/explore?filter=tagSearch%3Awork",
-      parentScope: "preserve",
-    });
+  it("keeps a Profile map origin intact", () => {
+    expect(resolveMemoParentPage({ pathname: "/u/alice", search: "?view=map", memoName: "memos/123" })).toBe("/u/alice?view=map");
   });
 
-  it("marks Profile cards as global without losing their Profile origin", () => {
-    expect(resolveMemoOrigin({ pathname: "/u/alice", search: "?view=map", memoName: "memos/123" })).toEqual({
-      parentPage: "/u/alice?view=map",
-      parentScope: "all",
-    });
+  it("uses Home for direct and shared resource entries", () => {
+    expect(resolveMemoDetailOrigin(undefined)).toBe("/");
+    expect(resolveMemoDetailOrigin({ unrelated: true })).toBe("/");
   });
 
-  it("uses an All Home origin for direct and shared resource entries", () => {
-    expect(resolveMemoDetailOrigin(undefined)).toEqual({ parentPage: "/", parentScope: "all" });
-    expect(resolveMemoDetailOrigin({ unrelated: true })).toEqual({ parentPage: "/", parentScope: "all" });
-  });
-
-  it("uses a user-level Archived origin without changing the remembered Space", () => {
-    expect(resolveMemoDetailOrigin(undefined, { memoArchived: true })).toEqual({ parentPage: "/archived", parentScope: "preserve" });
+  it("uses the user archive for a direct entry to an archived memo", () => {
+    expect(resolveMemoDetailOrigin(undefined, { memoArchived: true })).toBe("/archived");
   });
 
   it("keeps an explicit origin ahead of the archived fallback", () => {
-    expect(resolveMemoDetailOrigin(createMemoNavigationState("/u/alice", "all"), { memoArchived: true })).toEqual({
-      parentPage: "/u/alice",
-      parentScope: "all",
-    });
+    expect(resolveMemoDetailOrigin(createMemoNavigationState("/u/alice"), { memoArchived: true })).toBe("/u/alice");
   });
 
-  it("round-trips an explicit origin policy through router state", () => {
-    const state = createMemoNavigationState("/", "preserve");
-    expect(resolveMemoDetailOrigin(state)).toEqual({ parentPage: "/", parentScope: "preserve" });
-  });
-
-  it("infers policy for legacy from-only router state", () => {
-    expect(resolveMemoDetailOrigin({ from: "/archived" })).toEqual({ parentPage: "/archived", parentScope: "preserve" });
-    expect(resolveMemoDetailOrigin({ from: "/u/alice" })).toEqual({ parentPage: "/u/alice", parentScope: "all" });
-  });
-
-  it.each([
-    "/",
-    "/explore?filter=tagSearch%3Awork",
-    "/archived",
-    "/attachments",
-  ])("recognizes %s as a remembered collection origin", (page) => {
-    expect(isMemoCollectionOrigin(page)).toBe(true);
+  it("round-trips an explicit origin through router state", () => {
+    expect(resolveMemoDetailOrigin(createMemoNavigationState("/explore?filter=tagSearch%3Awork"))).toBe("/explore?filter=tagSearch%3Awork");
   });
 
   it.each([
diff --git a/web/tests/space-routes.test.tsx b/web/tests/space-routes.test.tsx
index e6fab18a..78552782 100644
--- a/web/tests/space-routes.test.tsx
+++ b/web/tests/space-routes.test.tsx
@@ -5,7 +5,7 @@ import { beforeEach, describe, expect, it, vi } from "vitest";
 import { resolveQuickFindSubmission } from "@/components/AppSidebar/QuickFindDialog";
 import { getRouteActionPolicy, getSidebarRouteKind } from "@/components/AppSidebar/routes";
 import { CalendarHeader } from "@/components/CalendarView/CalendarHeader";
-import { resolveMemoDetailOrigin, resolveMemoOrigin } from "@/components/MemoView/navigation";
+import { resolveMemoDetailOrigin, resolveMemoParentPage } from "@/components/MemoView/navigation";
 import Calendar from "@/pages/Calendar";
 import { buildCollectionPath, getSpaceSwitchPath, resolveCollectionRoute } from "@/router/routes";
 import { SpaceRoute } from "@/router/SpaceRoute";
@@ -59,10 +59,10 @@ describe("Space route contract", () => {
   it("carries the full calendar origin through a permanent memo link", () => {
     const parentPage = "/spaces/a/calendar/2026/09/06?filter=tagSearch%3Awork";
     expect(
-      resolveMemoOrigin({ pathname: "/spaces/a/calendar/2026/09/06", search: "?filter=tagSearch%3Awork", memoName: "memos/x" }),
-    ).toEqual({ parentPage, parentScope: "preserve" });
-    expect(resolveMemoDetailOrigin({ from: parentPage })).toEqual({ parentPage, parentScope: "preserve" });
-    expect(resolveMemoDetailOrigin(undefined)).toEqual({ parentPage: "/", parentScope: "all" });
+      resolveMemoParentPage({ pathname: "/spaces/a/calendar/2026/09/06", search: "?filter=tagSearch%3Awork", memoName: "memos/x" }),
+    ).toBe(parentPage);
+    expect(resolveMemoDetailOrigin({ from: parentPage })).toBe(parentPage);
+    expect(resolveMemoDetailOrigin(undefined)).toBe("/");
   });
 });