fix: hide AI assistant bubble from text flow and use full page context for selection panel

src/NexusReader.UI.Shared/Components/Molecules/SelectionAiPanel.razor

@@ -76,7 +76,11 @@
     private async Task RequestSummary()
     {
         IsLoading = true;
-        Packet = await Coordinator.RequestSummaryAndQuizAsync(SelectedText);
+        var contextPrompt = !string.IsNullOrWhiteSpace(FullPageContent) 
+            ? $"ANALYSIS CONTEXT (Full Page Content):\n{FullPageContent}\n\nUSER SELECTION TO SUMMARIZE:\n" 
+            : "";
+        
+        Packet = await Coordinator.RequestSummaryAndQuizAsync($"{contextPrompt}{SelectedText}");
         IsLoading = false;
     }
 

src/NexusReader.UI.Shared/Components/Organisms/ReaderCanvas.razor

@@ -29,14 +29,6 @@
                     {
                         <NexusTypography Variant="NexusTypography.TypographyVariant.Ebook">@((MarkupString)textSegment.Content)</NexusTypography>
                     }
-                    else if (block is AiActionTriggerBlock trigger)
-                    {
-                        <AiAssistantBubble 
-                            ContextBlockId="@trigger.Id" 
-                            Dialogue="@trigger.Dialogue" 
-                            Actions="@trigger.ActionOptions"
-                            FullPageContent="@GetFullPageContent()" />
-                    }
                 </div>
             }
         </div>