refactor(feed_core): limit headline title to two lines

- Reduce maxLines from 3 to 2 in HeadlineTileImageStart
- Reduce maxLines from 3 to 2 in HeadlineTileImageTop
- Reduce maxLines from 3 to 2 in HeadlineTileTextOnly

This change improves the consistency and readability of headline titles across different feed tile layouts.

Author: fulleni

lib/shared/widgets/feed_core/headline_tile_image_start.dart

@@ -107,7 +107,7 @@ class HeadlineTileImageStart extends StatelessWidget {
                       style: textTheme.titleMedium?.copyWith(
                         fontWeight: FontWeight.w500,
                       ),
-                      maxLines: 3,
+                      maxLines: 2,
                       overflow: TextOverflow.ellipsis,
                     ),
                   ],

lib/shared/widgets/feed_core/headline_tile_image_top.dart

@@ -125,7 +125,7 @@ class HeadlineTileImageTop extends StatelessWidget {
                       style: textTheme.titleMedium?.copyWith(
                         fontWeight: FontWeight.w500,
                       ),
-                      maxLines: 3,
+                      maxLines: 2,
                       overflow: TextOverflow.ellipsis,
                     ),
                   ),

lib/shared/widgets/feed_core/headline_tile_text_only.dart

@@ -80,7 +80,7 @@ class HeadlineTileTextOnly extends StatelessWidget {
                       style: textTheme.titleMedium?.copyWith(
                         fontWeight: FontWeight.w500,
                       ),
-                      maxLines: 3,
+                      maxLines: 2,
                       overflow: TextOverflow.ellipsis,
                     ),
                   ],