docs(SharePopover): correct inline-block/relative comments — inline-block is load-bearing, relative is incidental

DeepDrftPublic.Client/Controls/SharePopover.razor

@@ -1,11 +1,13 @@
 @namespace DeepDrftPublic.Client.Controls
 
-@* Overlay is viewport-level; keep it outside the anchor wrapper so it doesn't
-   inherit relative stacking context and still covers the full page. *@
+@* Overlay is viewport-level/fixed regardless of DOM nesting; placing it outside
+   the wrapper is harmless/cleaner but doesn't change its behavior. *@
 <MudOverlay Visible="@_open" OnClick="@Close" AutoClose="true" />
 
-@* Wrap the trigger and popover in a relative-positioned container so MudPopover
-   anchors to the button rather than the nearest positioned ancestor in the page. *@
+@* display:inline-block is the load-bearing property: it shrink-wraps this div
+   to the button, so MudPopover's portal reads the button's tight bounding rect
+   (via parentNode.getBoundingClientRect()) rather than a page-wide flow box.
+   position:relative is incidental. *@
 <div class="deepdrft-share-popover-anchor">
     <MudTooltip Text="Share">
         <MudIconButton Icon="@Icons.Material.Filled.Share"

DeepDrftPublic/wwwroot/styles/deepdrft-styles.css

@@ -358,8 +358,10 @@ h2, h3, h4, h5, h6,
     font-family: var(--deepdrft-font-mono) !important;
 }
 
-/* Relative-positioned wrapper that gives MudPopover a local anchor so it opens
-   adjacent to the share button rather than relative to the page body. */
+/* display:inline-block is load-bearing: it shrink-wraps the wrapper to the
+   button so MudPopover's portal reads the button's tight bounding rect
+   (parentNode.getBoundingClientRect()) instead of a page-wide flow box.
+   position:relative is incidental — do not drop inline-block. */
 .deepdrft-share-popover-anchor {
     position: relative;
     display: inline-block;