TF-4141 Add some space between the need action and preview

lib/features/thread/presentation/widgets/email_tile_builder.dart

@@ -131,7 +131,10 @@ class EmailTileBuilder extends StatelessWidget with BaseEmailItemTile {
                     presentationEmail,
                     isSearchEmailRunning,
                     searchQuery)),
-                  if (_shouldShowAIAction) const AiActionTagWidget(),
+                  if (_shouldShowAIAction)
+                    const AiActionTagWidget(
+                      margin: EdgeInsetsDirectional.only(start: 8),
+                    ),
                 ])
             ),
           ],

lib/features/thread/presentation/widgets/email_tile_web_builder.dart

@@ -172,7 +172,10 @@ class _EmailTileBuilderState extends State<EmailTileBuilder>  with BaseEmailItem
                           widget.searchQuery
                         )
                       ),
-                      if (_shouldShowAIAction) const AiActionTagWidget(),
+                      if (_shouldShowAIAction)
+                        const AiActionTagWidget(
+                          margin: EdgeInsetsDirectional.only(start: 8),
+                        ),
                     ]),
                   ]),
                 )

lib/features/thread/presentation/widgets/web_tablet_body_email_item_widget.dart

@@ -169,7 +169,9 @@ class _WebTabletBodyEmailItemWidgetState
                               ),
                             ),
                             if (widget.shouldShowAIAction)
-                              const AiActionTagWidget(),
+                              const AiActionTagWidget(
+                                margin: EdgeInsetsDirectional.only(start: 8),
+                              ),
                           ],
                         ),
                       ],