Add a clear all button to recent searches

Lets users wipe their whole search history at once from the recent
searches section header, as per the designs.

ElementX/Sources/Screens/SearchScreen/SearchScreenModels.swift

@@ -52,6 +52,7 @@ enum SearchScreenViewAction: CustomStringConvertible {
     case selectRoom(roomID: String)
     case selectMessage(roomID: String, eventID: String)
     case removeBreadcrumb(SearchScreenBreadcrumb)
+    case clearBreadcrumbs
     case reachedTop
     case reachedBottom
     case cancel
@@ -63,6 +64,7 @@ enum SearchScreenViewAction: CustomStringConvertible {
         case .selectRoom(let roomID): "selectRoom(\(roomID))"
         case .selectMessage(let roomID, let eventID): "selectMessage(\(roomID), \(eventID))"
         case .removeBreadcrumb: "removeBreadcrumb"
+        case .clearBreadcrumbs: "clearBreadcrumbs"
         case .reachedTop: "reachedTop"
         case .reachedBottom: "reachedBottom"
         case .cancel: "cancel"

ElementX/Sources/Screens/SearchScreen/SearchScreenViewModel.swift

@@ -149,6 +149,8 @@ class SearchScreenViewModel: SearchScreenViewModelType, SearchScreenViewModelPro
             actionsSubject.send(.presentRoom(roomID: roomID, eventID: eventID))
         case .removeBreadcrumb(let breadcrumb):
             removeBreadcrumb(breadcrumb)
+        case .clearBreadcrumbs:
+            userSettings.searchBreadcrumbs = []
         case .reachedTop:
             if state.bindings.searchMode == .rooms {
                 updateVisibleRange(edge: .top)

ElementX/Sources/Screens/SearchScreen/View/SearchScreen.swift

@@ -209,8 +209,19 @@ struct SearchScreen: View {
                     }
                 }
             } header: {
-                Text(UntranslatedL10n.screenSearchRecentSearches)
-                    .compoundListSectionHeader()
+                HStack(spacing: 8) {
+                    Text(UntranslatedL10n.screenSearchRecentSearches)
+                        .compoundListSectionHeader()
+                    
+                    Spacer()
+                    
+                    // The compound text link style has no accent colour variant.
+                    Button { context.send(viewAction: .clearBreadcrumbs) } label: {
+                        Text(L10n.actionClearAll)
+                            .font(.compound.bodyMDSemibold)
+                            .foregroundStyle(.compound.textActionAccent)
+                    }
+                }
             }
         }
         .compoundList(.plain)

PreviewTests/Sources/__Snapshots__/PreviewTests/searchScreen.Recent-searches-iPad-en-GB.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:4bc96637d784a679d6be590589758889a367355ee32bfe970a82e2f6079c3bbe
-size 107266
+oid sha256:8c8463b5471ab15009f661652b237cc61f540eea5c4c7d51d26e462487b52892
+size 109550

PreviewTests/Sources/__Snapshots__/PreviewTests/searchScreen.Recent-searches-iPad-pseudo.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:37dc8e32e88ead1940ae69f7b21426e0ec93136061fef5aa217962f8a2b3a9a8
-size 109477
+oid sha256:768478153a8dfe9d455fbb87269e79c3698c56cc3515ccb4b8c610ec91f204e6
+size 112054

PreviewTests/Sources/__Snapshots__/PreviewTests/searchScreen.Recent-searches-iPhone-en-GB.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:316e278e53ff463ac5a232b4767a420b31c09cc2da2d22e302dccee9d36f6520
-size 61192
+oid sha256:34c519522df41c5b63319d85a14bea386321922e5e208988d258f2df07ad7578
+size 63101

PreviewTests/Sources/__Snapshots__/PreviewTests/searchScreen.Recent-searches-iPhone-pseudo.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:437431e2bf9b05ebedb52638034bb367ab6990ec3ecdeb4d930b8a3d9078ed11
-size 63703
+oid sha256:cdc345436b48af82e9543daffc720db8d1c91bb10caf16e490eef4eecf2a4af5
+size 67108

UnitTests/Sources/SearchScreenViewModelTests.swift

@@ -162,6 +162,15 @@ struct SearchScreenViewModelTests {
         #expect(userSettings.searchBreadcrumbs.isEmpty)
     }
     
+    @Test
+    func clearingBreadcrumbs() {
+        userSettings.searchBreadcrumbs = [.query("Second"), .room(roomID: "2")]
+        
+        context.send(viewAction: .clearBreadcrumbs)
+        
+        #expect(userSettings.searchBreadcrumbs.isEmpty)
+    }
+    
     @Test
     func breadcrumbsAreDisplayed() async throws {
         staticRoomListSubject.send([.mock(id: "2", name: "Second")])