feat(headlines): truncate long filter names in saved filters bar

Enhances the `SavedFiltersBar` UI by ensuring long names on pinned filter chips are gracefully truncated with an ellipsis. This maintains a clean, single-line display and improves layout consistency.

Author: fulleni

lib/headlines-feed/widgets/saved_filters_bar.dart

@@ -211,7 +211,11 @@ class _SavedFiltersBarState extends State<SavedFiltersBar> {
                     horizontal: AppSpacing.xs,
                   ),
                   child: ChoiceChip(
-                    label: Text(filter.name),
+                    label: Text(
+                      filter.name,
+                      maxLines: 1,
+                      overflow: TextOverflow.ellipsis,
+                    ),
                     labelPadding: const EdgeInsets.symmetric(
                       horizontal: AppSpacing.xs,
                     ),