fix: preserve inbox comment anchors for MUL-3294

Co-authored-by: multica-agent <github@multica.ai>

apps/mobile/lib/inbox-display.test.ts

@@ -0,0 +1,54 @@
+import { describe, expect, it } from "vitest";
+import type { InboxItem } from "@multica/core/types";
+import { deduplicateInboxItems } from "./inbox-display";
+
+function item(overrides: Partial<InboxItem>): InboxItem {
+  return {
+    id: "inbox-1",
+    workspace_id: "workspace-1",
+    recipient_type: "member",
+    recipient_id: "member-1",
+    actor_type: "agent",
+    actor_id: "agent-1",
+    type: "new_comment",
+    severity: "info",
+    issue_id: "issue-1",
+    title: "Issue title",
+    body: null,
+    issue_status: null,
+    read: false,
+    archived: false,
+    created_at: "2026-06-15T08:00:00Z",
+    details: null,
+    ...overrides,
+  };
+}
+
+describe("deduplicateInboxItems", () => {
+  it("keeps the newest issue row while preserving an older comment anchor", () => {
+    const merged = deduplicateInboxItems([
+      item({
+        id: "comment-notification",
+        created_at: "2026-06-15T08:00:00Z",
+        details: { comment_id: "comment-1" },
+      }),
+      item({
+        id: "status-notification",
+        type: "status_changed",
+        created_at: "2026-06-15T08:01:00Z",
+        details: { from: "in_progress", to: "in_review" },
+      }),
+    ]);
+
+    expect(merged).toHaveLength(1);
+    expect(merged[0]).toMatchObject({
+      id: "status-notification",
+      type: "status_changed",
+      details: {
+        from: "in_progress",
+        to: "in_review",
+        comment_id: "comment-1",
+      },
+    });
+  });
+});

apps/mobile/lib/inbox-display.ts

@@ -62,7 +62,9 @@ export function getInboxDisplayTitle(item: InboxItem): string {
  *   2. Group by `issue_id` (fall back to `id` for items with no issue
  *      attached — e.g. quick_create_failed).
  *   3. In each group, keep the newest by `created_at`.
- *   4. Sort the result newest-first.
+ *   4. Preserve the newest grouped `comment_id` anchor when the newest row
+ *      is a later status/metadata event for the same issue.
+ *   5. Sort the result newest-first.
  */
 export function deduplicateInboxItems(items: InboxItem[]): InboxItem[] {
   const active = items.filter((i) => !i.archived);
@@ -79,7 +81,22 @@ export function deduplicateInboxItems(items: InboxItem[]): InboxItem[] {
       (a, b) =>
         new Date(b.created_at).getTime() - new Date(a.created_at).getTime(),
     );
-    if (group[0]) merged.push(group[0]);
+    const newest = group[0];
+    if (!newest) continue;
+
+    const commentId =
+      newest.details?.comment_id ??
+      group.find((item) => item.details?.comment_id)?.details?.comment_id;
+
+    if (commentId && newest.details?.comment_id !== commentId) {
+      merged.push({
+        ...newest,
+        details: { ...(newest.details ?? {}), comment_id: commentId },
+      });
+      continue;
+    }
+
+    merged.push(newest);
   }
   return merged.sort(
     (a, b) =>

packages/core/inbox/queries.test.ts

@@ -0,0 +1,74 @@
+import { describe, expect, it } from "vitest";
+import type { InboxItem } from "../types";
+import { deduplicateInboxItems } from "./queries";
+
+function item(overrides: Partial<InboxItem>): InboxItem {
+  return {
+    id: "inbox-1",
+    workspace_id: "workspace-1",
+    recipient_type: "member",
+    recipient_id: "member-1",
+    actor_type: "agent",
+    actor_id: "agent-1",
+    type: "new_comment",
+    severity: "info",
+    issue_id: "issue-1",
+    title: "Issue title",
+    body: null,
+    issue_status: null,
+    read: false,
+    archived: false,
+    created_at: "2026-06-15T08:00:00Z",
+    details: null,
+    ...overrides,
+  };
+}
+
+describe("deduplicateInboxItems", () => {
+  it("keeps the newest issue row while preserving an older comment anchor", () => {
+    const merged = deduplicateInboxItems([
+      item({
+        id: "comment-notification",
+        type: "new_comment",
+        created_at: "2026-06-15T08:00:00Z",
+        details: { comment_id: "comment-1" },
+      }),
+      item({
+        id: "status-notification",
+        type: "status_changed",
+        created_at: "2026-06-15T08:01:00Z",
+        details: { from: "in_progress", to: "in_review" },
+      }),
+    ]);
+
+    expect(merged).toHaveLength(1);
+    expect(merged[0]).toMatchObject({
+      id: "status-notification",
+      type: "status_changed",
+      details: {
+        from: "in_progress",
+        to: "in_review",
+        comment_id: "comment-1",
+      },
+    });
+  });
+
+  it("preserves the newest row's own comment anchor", () => {
+    const merged = deduplicateInboxItems([
+      item({
+        id: "older-comment",
+        created_at: "2026-06-15T08:00:00Z",
+        details: { comment_id: "comment-1" },
+      }),
+      item({
+        id: "newer-comment",
+        created_at: "2026-06-15T08:02:00Z",
+        details: { comment_id: "comment-2" },
+      }),
+    ]);
+
+    expect(merged).toHaveLength(1);
+    expect(merged[0]?.id).toBe("newer-comment");
+    expect(merged[0]?.details?.comment_id).toBe("comment-2");
+  });
+});

packages/core/inbox/queries.ts

@@ -50,7 +50,22 @@ export function deduplicateInboxItems(items: InboxItem[]): InboxItem[] {
       (a, b) =>
         new Date(b.created_at).getTime() - new Date(a.created_at).getTime(),
     );
-    if (group[0]) merged.push(group[0]);
+    const newest = group[0];
+    if (!newest) continue;
+
+    const commentId =
+      newest.details?.comment_id ??
+      group.find((item) => item.details?.comment_id)?.details?.comment_id;
+
+    if (commentId && newest.details?.comment_id !== commentId) {
+      merged.push({
+        ...newest,
+        details: { ...(newest.details ?? {}), comment_id: commentId },
+      });
+      continue;
+    }
+
+    merged.push(newest);
   }
   return merged.sort(
     (a, b) =>