fix(me): show activity on closed/merged items in dashboard

The activity feed and since-last-check inbox previously filtered to
only open items via state = 'opened' checks in the SQL subqueries.
This meant comments on merged MRs (post-merge follow-ups, questions)
and closed issues were silently dropped from the feed.

Remove the state filter from the association checks in both
query_activity() and query_since_last_check(). The user-association
checks (assigned, authored, reviewing) remain — activity still only
appears for items the user is connected to, regardless of state.

The simplified subqueries also eliminate unnecessary JOINs to the
issues/merge_requests tables that were only needed for the state
check, resulting in slightly more efficient index-only scans on
issue_assignees and mr_reviewers.

Add 4 tests covering: merged MR (authored), closed MR (reviewer),
closed issue (assignee), and merged MR in the since-last-check inbox.

src/cli/commands/me/me_tests.rs

@@ -627,6 +627,115 @@ fn activity_is_own_flag() {
     assert!(results[0].is_own);
 }
 
+// ─── Activity on Closed/Merged Items ─────────────────────────────────────────
+
+#[test]
+fn activity_note_on_merged_authored_mr() {
+    let conn = setup_test_db();
+    insert_project(&conn, 1, "group/repo");
+    insert_mr(&conn, 10, 1, 99, "alice", "merged", false);
+
+    let disc_id = 100;
+    insert_discussion(&conn, disc_id, 1, Some(10), None);
+    let t = now_ms() - 1000;
+    insert_note_at(
+        &conn,
+        200,
+        disc_id,
+        1,
+        "bob",
+        false,
+        "follow-up question",
+        t,
+    );
+
+    let results = query_activity(&conn, "alice", &[], 0).unwrap();
+    assert_eq!(
+        results.len(),
+        1,
+        "should see activity on merged MR authored by user"
+    );
+    assert_eq!(results[0].entity_iid, 99);
+    assert_eq!(results[0].entity_type, "mr");
+}
+
+#[test]
+fn activity_note_on_closed_mr_as_reviewer() {
+    let conn = setup_test_db();
+    insert_project(&conn, 1, "group/repo");
+    insert_mr(&conn, 10, 1, 99, "bob", "closed", false);
+    insert_reviewer(&conn, 10, "alice");
+
+    let disc_id = 100;
+    insert_discussion(&conn, disc_id, 1, Some(10), None);
+    let t = now_ms() - 1000;
+    insert_note_at(&conn, 200, disc_id, 1, "bob", false, "can you re-check?", t);
+
+    let results = query_activity(&conn, "alice", &[], 0).unwrap();
+    assert_eq!(
+        results.len(),
+        1,
+        "should see activity on closed MR where user is reviewer"
+    );
+}
+
+#[test]
+fn activity_note_on_closed_assigned_issue() {
+    let conn = setup_test_db();
+    insert_project(&conn, 1, "group/repo");
+    insert_issue_with_state(&conn, 10, 1, 42, "someone", "closed");
+    insert_assignee(&conn, 10, "alice");
+
+    let disc_id = 100;
+    insert_discussion(&conn, disc_id, 1, None, Some(10));
+    let t = now_ms() - 1000;
+    insert_note_at(
+        &conn,
+        200,
+        disc_id,
+        1,
+        "bob",
+        false,
+        "reopening discussion",
+        t,
+    );
+
+    let results = query_activity(&conn, "alice", &[], 0).unwrap();
+    assert_eq!(
+        results.len(),
+        1,
+        "should see activity on closed issue assigned to user"
+    );
+}
+
+#[test]
+fn since_last_check_includes_comment_on_merged_mr() {
+    let conn = setup_test_db();
+    insert_project(&conn, 1, "group/repo");
+    insert_mr(&conn, 10, 1, 99, "alice", "merged", false);
+
+    let disc_id = 100;
+    insert_discussion(&conn, disc_id, 1, Some(10), None);
+    let t = now_ms() - 1000;
+    insert_note_at(
+        &conn,
+        200,
+        disc_id,
+        1,
+        "bob",
+        false,
+        "post-merge question",
+        t,
+    );
+
+    let groups = query_since_last_check(&conn, "alice", 0).unwrap();
+    let total_events: usize = groups.iter().map(|g| g.events.len()).sum();
+    assert_eq!(
+        total_events, 1,
+        "should see others' comments on merged MR in inbox"
+    );
+}
+
 // ─── Assignment Detection Tests (Task #12) ─────────────────────────────────
 
 #[test]