misc: chore: Use explicit types & fix object creation

src/Ryujinx.UI.LocaleGenerator/LocaleGenerator.cs

@@ -1,4 +1,5 @@
 using Microsoft.CodeAnalysis;
+using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 
@@ -9,18 +10,18 @@ namespace Ryujinx.UI.LocaleGenerator
     {
         public void Initialize(IncrementalGeneratorInitializationContext context)
         {
-            var englishLocaleFile = context.AdditionalTextsProvider.Where(static x => x.Path.EndsWith("en_US.json"));
+            IncrementalValuesProvider<AdditionalText> englishLocaleFile = context.AdditionalTextsProvider.Where(static x => x.Path.EndsWith("en_US.json"));
 
             IncrementalValuesProvider<string> contents = englishLocaleFile.Select((text, cancellationToken) => text.GetText(cancellationToken)!.ToString());
 
             context.RegisterSourceOutput(contents, (spc, content) =>
             {
-                var lines = content.Split('\n').Where(x => x.Trim().StartsWith("\"")).Select(x => x.Split(':')[0].Trim().Replace("\"", ""));
+                IEnumerable<string> lines = content.Split('\n').Where(x => x.Trim().StartsWith("\"")).Select(x => x.Split(':')[0].Trim().Replace("\"", ""));
                 StringBuilder enumSourceBuilder = new();
                 enumSourceBuilder.AppendLine("namespace Ryujinx.Ava.Common.Locale;");
                 enumSourceBuilder.AppendLine("internal enum LocaleKeys");
                 enumSourceBuilder.AppendLine("{");
-                foreach (var line in lines)
+                foreach (string? line in lines)
                 {
                     enumSourceBuilder.AppendLine($"    {line},");
                 }