Polish AddSourceView layout on tvOS

Add a TVSourceRowLabelStyle for consistent icon/text spacing, switch
the Scan Network button to TVFormRowButtonStyle so it matches the
NavigationLink rows, and drop the duplicate navigationTitle in
AddWebDAV/AddSMB views since the title is already shown in the
TVSidebarDetailContainer sidebar.

Yattee/Views/Settings/AddSource/AddSMBView.swift

@@ -54,10 +54,12 @@ struct AddSMBView: View {
         #if os(iOS)
         .scrollDismissesKeyboard(.interactively)
         #endif
+        #if !os(tvOS)
         .navigationTitle(String(localized: "sources.addSMB"))
         #if os(iOS)
         .navigationBarTitleDisplayMode(.inline)
         #endif
+        #endif
         .onAppear {
             if let prefillServer {
                 server = prefillServer

Yattee/Views/Settings/AddSource/AddWebDAVView.swift

@@ -55,10 +55,12 @@ struct AddWebDAVView: View {
         #if os(iOS)
         .scrollDismissesKeyboard(.interactively)
         #endif
+        #if !os(tvOS)
         .navigationTitle(String(localized: "sources.addWebDAV"))
         #if os(iOS)
         .navigationBarTitleDisplayMode(.inline)
         #endif
+        #endif
         .onAppear {
             if let url = prefillURL {
                 urlString = url.absoluteString

Yattee/Views/Settings/AddSourceView.swift

@@ -120,6 +120,9 @@ struct AddSourceView: View {
                     #endif
                 } label: {
                     Label(String(localized: "sources.addWebDAV"), systemImage: "externaldrive.connected.to.line.below")
+                    #if os(tvOS)
+                        .labelStyle(TVSourceRowLabelStyle())
+                    #endif
                 }
 
                 NavigationLink {
@@ -135,6 +138,9 @@ struct AddSourceView: View {
                     #endif
                 } label: {
                     Label(String(localized: "sources.addSMB"), systemImage: "server.rack")
+                    #if os(tvOS)
+                        .labelStyle(TVSourceRowLabelStyle())
+                    #endif
                 }
 
                 NavigationLink {
@@ -150,6 +156,9 @@ struct AddSourceView: View {
                     #endif
                 } label: {
                     Label(String(localized: "sources.addRemoteServer"), systemImage: "globe")
+                    #if os(tvOS)
+                        .labelStyle(TVSourceRowLabelStyle())
+                    #endif
                 }
 
                 NavigationLink {
@@ -178,6 +187,9 @@ struct AddSourceView: View {
                             .aspectRatio(contentMode: .fit)
                             .frame(width: 24, height: 24)
                     }
+                    #if os(tvOS)
+                    .labelStyle(TVSourceRowLabelStyle())
+                    #endif
                 }
             }
 
@@ -187,9 +199,12 @@ struct AddSourceView: View {
                     showingNetworkDiscovery = true
                 } label: {
                     Label(String(localized: "discovery.scanNetwork"), systemImage: "wifi")
+                    #if os(tvOS)
+                        .labelStyle(TVSourceRowLabelStyle())
+                    #endif
                 }
                 #if os(tvOS)
-                .buttonStyle(TVSettingsButtonStyle())
+                .buttonStyle(TVFormRowButtonStyle())
                 #endif
             } footer: {
                 Text(String(localized: "sources.footer.discovery"))

Yattee/Views/Settings/TVSettingsButtonStyles.swift

@@ -144,6 +144,18 @@ struct TVSettingsToggle: View {
     }
 }
 
+/// Label style for source rows - explicit icon/text spacing
+struct TVSourceRowLabelStyle: LabelStyle {
+    func makeBody(configuration: Configuration) -> some View {
+        HStack(spacing: 20) {
+            configuration.icon
+                .frame(width: 36, height: 36)
+            configuration.title
+            Spacer(minLength: 0)
+        }
+    }
+}
+
 /// Button style for form rows (toggles, pickers) - matches form appearance
 struct TVFormRowButtonStyle: ButtonStyle {
     @Environment(\.isFocused) private var isFocused