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.LinqToSql/Breakdowns/LinqQueryBreakdown.cs

@@ -34,7 +34,7 @@ public class LinqQueryBreakdown : QueryBreakdown
     /// <summary>
     /// Gets or sets the list of LINQ method calls in the query chain.
     /// </summary>
-    public List<string> MethodCallChain { get; set; } = new();
+    public List<string> MethodCallChain { get; set; } = [];
 
     /// <summary>
     /// Initializes a new instance of the <see cref="LinqQueryBreakdown"/> class.
@@ -260,7 +260,7 @@ public class LinqQueryBreakdown : QueryBreakdown
     /// <returns>An InsertBreakdown representing the bulk insert operation.</returns>
     public static Breakdowns.SqlServer.InsertBreakdown AnalyzeInsertRange<T>(IEnumerable<T> entities) where T : class
     {
-        var entitiesList = entities?.ToList() ?? new List<T>();
+        var entitiesList = entities?.ToList() ?? [];
         if (entitiesList.Count == 0)
         {
             throw new ArgumentException("Must provide at least one entity to insert.", nameof(entities));