docs+ui: backfill XML doc comments and finish dashboard layout pass

Adds missing <summary>/<param> XML docs across 99 server, worker, and test
files so CommentChecker reports zero issues (TreatWarningsAsErrors needs the
analyzer clean). Bundles in WIP dashboard work: NavSection extraction,
MainLayout/site.css/js styling alignment, and DashboardOptions/Auth tweaks.

src/ZB.MOM.WW.MxGateway.Worker/MxAccess/MxAccessValueCache.cs

@@ -57,6 +57,9 @@ public sealed class MxAccessValueCache
     }
 
     /// <summary>Tries to read the most recent cached value for the handle pair.</summary>
+    /// <param name="serverHandle">MXAccess server handle.</param>
+    /// <param name="itemHandle">MXAccess item handle.</param>
+    /// <param name="value">The cached value if found.</param>
     public bool TryGet(
         int serverHandle,
         int itemHandle,
@@ -74,6 +77,8 @@ public sealed class MxAccessValueCache
     ///     when an item is unregistered so stale values are not served to a
     ///     subsequent ReadBulk after a tag is removed and re-added.
     /// </summary>
+    /// <param name="serverHandle">MXAccess server handle.</param>
+    /// <param name="itemHandle">MXAccess item handle.</param>
     public void Remove(
         int serverHandle,
         int itemHandle)
@@ -95,6 +100,7 @@ public sealed class MxAccessValueCache
     /// <param name="sinceVersion">Version snapshot captured before the wait.</param>
     /// <param name="deadlineUtc">Absolute UTC deadline.</param>
     /// <param name="pumpStep">Action that pumps any pending Windows messages.</param>
+    /// <param name="value">The cached value if the update was received before the deadline.</param>
     /// <param name="pollIntervalMs">How long to sleep between pump cycles. Default 5 ms.</param>
     public bool TryWaitForUpdate(
         int serverHandle,
@@ -129,6 +135,8 @@ public sealed class MxAccessValueCache
     }
 
     /// <summary>Returns the current version for a handle pair, or 0 if no entry exists.</summary>
+    /// <param name="serverHandle">MXAccess server handle.</param>
+    /// <param name="itemHandle">MXAccess item handle.</param>
     public ulong CurrentVersion(
         int serverHandle,
         int itemHandle)
@@ -158,6 +166,11 @@ public sealed class MxAccessValueCache
     public readonly struct CachedValue
     {
         /// <summary>Initializes a new cached value snapshot.</summary>
+        /// <param name="version">Version counter incremented on each update.</param>
+        /// <param name="value">The MXAccess value.</param>
+        /// <param name="quality">The MXAccess quality code.</param>
+        /// <param name="sourceTimestamp">The source timestamp of the value.</param>
+        /// <param name="statuses">The MXAccess status codes.</param>
         public CachedValue(
             ulong version,
             MxValue value,