Allow removing individual search breadcrumbs

Each recent search now has a trailing close button to remove it from
the history. The view action is logged without its payload so removed
queries don't end up in the logs.

UnitTests/Sources/SearchScreenViewModelTests.swift

@@ -149,6 +149,19 @@ struct SearchScreenViewModelTests {
         #expect(userSettings.searchBreadcrumbs == [.room(roomID: "2"), .query("Second")])
     }
     
+    @Test
+    func removingBreadcrumbs() {
+        userSettings.searchBreadcrumbs = [.query("Second"), .room(roomID: "2")]
+        
+        context.send(viewAction: .removeBreadcrumb(.query("Second")))
+        
+        #expect(userSettings.searchBreadcrumbs == [.room(roomID: "2")])
+        
+        context.send(viewAction: .removeBreadcrumb(.room(SearchScreenRoom(.mock(id: "2", name: "Second")))))
+        
+        #expect(userSettings.searchBreadcrumbs.isEmpty)
+    }
+    
     @Test
     func breadcrumbsAreDisplayed() async throws {
         staticRoomListSubject.send([.mock(id: "2", name: "Second")])