Update realtime suggestion debounce to minimum 0.25

Author: intitni

Core/Sources/Service/RealtimeSuggestionController.swift

@@ -142,7 +142,7 @@ public actor RealtimeSuggestionController {
     func triggerPrefetchDebounced(force: Bool = false) {
         inflightPrefetchTask = Task(priority: .utility) { @WorkspaceActor in
             try? await Task.sleep(nanoseconds: UInt64(
-                max(UserDefaults.shared.value(for: \.realtimeSuggestionDebounce), 0.15)
+                max(UserDefaults.shared.value(for: \.realtimeSuggestionDebounce), 0.25)
                     * 1_000_000_000
             ))