Fix add button. Fix hotkeys in settings. Add Workspace hotkeys

Downterm/CommandNotch/Models/WorkspaceRegistry.swift

@@ -104,6 +104,37 @@ final class WorkspaceRegistry: ObservableObject {
         persistWorkspaceSummaries()
     }
 
+    func updateWorkspaceHotkey(id: WorkspaceID, to hotkey: HotkeyBinding?) {
+        guard let index = workspaceSummaries.firstIndex(where: { $0.id == id }) else { return }
+        guard workspaceSummaries[index].hotkey != hotkey else { return }
+
+        workspaceSummaries[index].hotkey = hotkey
+        controllers[id]?.updateHotkey(hotkey)
+        persistWorkspaceSummaries()
+    }
+
+    func nextWorkspaceID(after id: WorkspaceID) -> WorkspaceID? {
+        guard !workspaceSummaries.isEmpty else { return nil }
+        guard let index = workspaceSummaries.firstIndex(where: { $0.id == id }) else {
+            return workspaceSummaries.first?.id
+        }
+
+        let nextIndex = workspaceSummaries.index(after: index)
+        return workspaceSummaries[nextIndex == workspaceSummaries.endIndex ? workspaceSummaries.startIndex : nextIndex].id
+    }
+
+    func previousWorkspaceID(before id: WorkspaceID) -> WorkspaceID? {
+        guard !workspaceSummaries.isEmpty else { return nil }
+        guard let index = workspaceSummaries.firstIndex(where: { $0.id == id }) else {
+            return workspaceSummaries.last?.id
+        }
+
+        let previousIndex = index == workspaceSummaries.startIndex
+            ? workspaceSummaries.index(before: workspaceSummaries.endIndex)
+            : workspaceSummaries.index(before: index)
+        return workspaceSummaries[previousIndex].id
+    }
+
     @discardableResult
     func deleteWorkspace(id: WorkspaceID) -> Bool {
         guard canDeleteWorkspace(id: id) else { return false }