Fix build and code structure improvements. New but essential UI functionality. CI improvements. Documentation improvements. AI module improvements.

src/Findings/StellaOps.Findings.Ledger.WebService/Program.cs

@@ -1,3 +1,4 @@
+#pragma warning disable CS0436 // Type conflicts with imported type - local Program class is intentionally used
 using Microsoft.AspNetCore.Diagnostics;
 using Microsoft.AspNetCore.Http.HttpResults;
 using Microsoft.AspNetCore.Mvc;
@@ -1942,7 +1943,7 @@ static async Task<Results<FileStreamHttpResult, JsonHttpResult<ExportPage<T>>, P
     }
     httpContext.Response.Headers["X-Stella-Result-Count"] = page.Items.Count.ToString();
 
-    var acceptsNdjson = httpContext.Request.Headers.Accept.Any(h => h.Contains("application/x-ndjson", StringComparison.OrdinalIgnoreCase));
+    var acceptsNdjson = httpContext.Request.Headers.Accept.Any(h => h?.Contains("application/x-ndjson", StringComparison.OrdinalIgnoreCase) == true);
     if (acceptsNdjson)
     {
         httpContext.Response.ContentType = "application/x-ndjson";
@@ -1975,32 +1976,32 @@ static bool TryGetTenant(HttpContext httpContext, out ProblemHttpResult? problem
     return true;
 }
 
-static int? ParseInt(string value)
+static int? ParseInt(string? value)
 {
     return int.TryParse(value, out var result) ? result : null;
 }
 
-static long? ParseLong(string value)
+static long? ParseLong(string? value)
 {
     return long.TryParse(value, out var result) ? result : null;
 }
 
-static DateTimeOffset? ParseDate(string value)
+static DateTimeOffset? ParseDate(string? value)
 {
     return DateTimeOffset.TryParse(value, out var result) ? result : null;
 }
 
-static decimal? ParseDecimal(string value)
+static decimal? ParseDecimal(string? value)
 {
     return decimal.TryParse(value, out var result) ? result : null;
 }
 
-static bool? ParseBool(string value)
+static bool? ParseBool(string? value)
 {
     return bool.TryParse(value, out var result) ? result : null;
 }
 
-static Guid? ParseGuid(string value)
+static Guid? ParseGuid(string? value)
 {
     return Guid.TryParse(value, out var result) ? result : null;
 }