Modernize networking layer and fix category navigation and recipe list bugs

Network layer:
- Replace static CookbookApi protocol with instance-based CookbookApiProtocol
  using async/throws instead of tuple returns
- Refactor ApiRequest to use URLComponents for proper URL encoding, replace
  print statements with OSLog, and return typed NetworkError cases
- Add structured NetworkError variants (httpError, connectionError, etc.)
- Remove global cookbookApi constant in favor of injected dependency on AppState
- Delete unused RecipeEditViewModel, RecipeScraper, and Scraper playground

Data & model fixes:
- Add custom Decodable for RecipeDetail with safe fallbacks for malformed JSON
- Make Category Hashable/Equatable use only `name` so NavigationSplitView
  selection survives category refreshes with updated recipe_count
- Return server-assigned ID from uploadRecipe so new recipes get their ID
  before the post-upload refresh block executes

View updates:
- Refresh both old and new category recipe lists after upload when category
  changes, mapping empty recipeCategory to "*" for uncategorized recipes
- Raise deployment target to iOS 18, adopt new SwiftUI API conventions
- Clean up alerts, onboarding views, and settings

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Nextcloud Cookbook iOS Client/Views/Onboarding/OnboardingView.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import OSLog
 import SwiftUI
 
 struct OnboardingView: View {
@@ -203,7 +204,7 @@ struct ServerAddressField: View {
                     .tint(.white)
                     .font(.headline)
                     .onChange(of: serverProtocol) { value in
-                        print(value)
+                        Logger.view.debug("\(value.rawValue)")
                         userSettings.serverProtocol = value.rawValue
                     }
                     

Nextcloud Cookbook iOS Client/Views/Onboarding/TokenLoginView.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import OSLog
 import SwiftUI
 
 
@@ -72,7 +73,7 @@ struct TokenLoginView: View {
             case .username:
                 focusedField = .token
             default:
-                print("Attempting to log in ...")
+                Logger.view.debug("Attempting to log in ...")
             }
         }
     }
@@ -87,21 +88,16 @@ struct TokenLoginView: View {
             showAlert = true
             return false
         }
-        
+
         UserSettings.shared.setAuthString()
-        let (data, error) = await cookbookApi.getCategories(auth: UserSettings.shared.authString)
-        
-        if let error = error {
+        let client = CookbookApiFactory.makeClient()
+        do {
+            let _ = try await client.getCategories()
+            return true
+        } catch {
             alertMessage = "Login failed. Please check your inputs and internet connection."
             showAlert = true
             return false
         }
-        
-        guard let data = data else {
-            alertMessage = "Login failed. Please check your inputs."
-            showAlert = true
-            return false
-        }
-        return true
     }
 }

Nextcloud Cookbook iOS Client/Views/Onboarding/V2LoginView.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import OSLog
 import SwiftUI
 import WebKit
 
@@ -82,7 +83,7 @@ struct V2LoginView: View {
                         Task {
                             let error = await sendLoginV2Request()
                             if let error = error {
-                                alertMessage = "A network error occured (\(error.rawValue))."
+                                alertMessage = "A network error occured (\(error.localizedDescription))."
                                 showAlert = true
                             }
                             if let loginRequest = loginRequest {
@@ -151,13 +152,13 @@ struct V2LoginView: View {
     }
     
     func fetchLoginV2Response() async -> (LoginV2Response?, NetworkError?) {
-        guard let loginRequest = loginRequest else { return (nil, .parametersNil) }
+        guard let loginRequest = loginRequest else { return (nil, .invalidRequest) }
         return await NextcloudApi.loginV2Response(req: loginRequest)
     }
     
     func checkLogin(response: LoginV2Response?, error: NetworkError?) {
         if let error = error {
-            alertMessage = "Login failed. Please login via the browser and try again. (\(error.rawValue))"
+            alertMessage = "Login failed. Please login via the browser and try again. (\(error.localizedDescription))"
             showAlert = true
             return
         }
@@ -166,7 +167,7 @@ struct V2LoginView: View {
             showAlert = true
             return
         }
-        print("Login successful for user \(response.loginName)!")
+        Logger.network.debug("Login successful for user \(response.loginName)!")
         UserSettings.shared.username = response.loginName
         UserSettings.shared.token = response.appPassword
         let loginString = "\(UserSettings.shared.username):\(UserSettings.shared.token)"