chore(sonar): apply collection-expression syntax across all sites (IDE0028)

Manual sweep of all 42 IDE0028 sites flagged by SonarQube — `dotnet format
analyzers --diagnostics IDE0028` declined to fix these (no .editorconfig
opt-in for `dotnet_style_prefer_collection_expression`), so applied by
hand. The repo already targets `<LangVersion>latest</LangVersion>` on
net8.0, so C# 12 collection expressions are available.

Pattern: `new List<T>()` / `new Dictionary<K,V>()` / `new ArrayList()` /
`new()` -> `[]` for empty; `new List<T> { ... }` -> `[...]` for literal.

24 files touched in src/{EFCore, LinqToSql, Query, Snowflake, SqlBreakdown,
SqlServer}; tests untouched (no IDE0028 sites in test code).

Build clean (35 warnings unchanged from baseline, 0 errors). All tests
remain green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Strata.SqlTools.EFCore/Models/QueryBreakdownEntity.cs

@@ -113,10 +113,10 @@ public class QueryBreakdownEntity
     /// <summary>
     /// Navigation property for the related query parameters.
     /// </summary>
-    public virtual ICollection<QueryParameterEntity> Parameters { get; set; } = new List<QueryParameterEntity>();
+    public virtual ICollection<QueryParameterEntity> Parameters { get; set; } = [];
 
     /// <summary>
     /// Navigation property for the related WITH clauses (CTEs).
     /// </summary>
-    public virtual ICollection<WithClauseEntity> WithClauses { get; set; } = new List<WithClauseEntity>();
+    public virtual ICollection<WithClauseEntity> WithClauses { get; set; } = [];
 }

src/Strata.SqlTools.EFCore/Services/QueryBreakdownMapper.cs

@@ -226,7 +226,7 @@ public class QueryBreakdownMapper : IQueryBreakdownMapper
 
     internal static List<string> DeserializeList(string json)
     {
-        return JsonSerializer.Deserialize<List<string>>(json) ?? new List<string>();
+        return JsonSerializer.Deserialize<List<string>>(json) ?? [];
     }
 
     internal static string SerializeArrayList(ArrayList list)
@@ -241,7 +241,7 @@ public class QueryBreakdownMapper : IQueryBreakdownMapper
 
     internal static ArrayList DeserializeArrayList(string json)
     {
-        var stringList = JsonSerializer.Deserialize<List<string>>(json) ?? new List<string>();
+        var stringList = JsonSerializer.Deserialize<List<string>>(json) ?? [];
         var arrayList = new ArrayList();
         foreach (var item in stringList)
         {
@@ -262,7 +262,7 @@ public class QueryBreakdownMapper : IQueryBreakdownMapper
 
     internal static Dictionary<string, object> DeserializeDictionary(string json)
     {
-        var stringDict = JsonSerializer.Deserialize<Dictionary<string, string>>(json) ?? new Dictionary<string, string>();
+        var stringDict = JsonSerializer.Deserialize<Dictionary<string, string>>(json) ?? [];
         var result = new Dictionary<string, object>();
         foreach (var kvp in stringDict)
         {