feat: show link URL below post body for news stories

sojorn_app/lib/widgets/sojorn_post_card.dart

@@ -2,6 +2,7 @@ import 'dart:ui';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:google_fonts/google_fonts.dart';
+import 'package:url_launcher/url_launcher.dart';
 import '../models/post.dart';
 import '../providers/settings_provider.dart';
 
@@ -264,6 +265,23 @@ class _sojornPostCardState extends ConsumerState<sojornPostCard> {
                           ),
                         ),
                       ],
+                      // Show link URL below post body for posts with link previews
+                      if (post.hasLinkPreview && post.linkPreviewUrl != null) ...[
+                        const SizedBox(height: 6),
+                        GestureDetector(
+                          onTap: () => _launchPreviewUrl(post.linkPreviewUrl!),
+                          child: Text(
+                            _truncateUrl(post.linkPreviewUrl!),
+                            style: TextStyle(
+                              color: AppTheme.royalPurple,
+                              fontSize: 13,
+                              fontWeight: FontWeight.w500,
+                              decoration: TextDecoration.underline,
+                              decorationColor: AppTheme.royalPurple.withValues(alpha: 0.5),
+                            ),
+                          ),
+                        ),
+                      ],
                     ],
                   ),
                 ),
@@ -381,6 +399,27 @@ class _sojornPostCardState extends ConsumerState<sojornPostCard> {
       ),
     );
   }
+
+  String _truncateUrl(String url) {
+    if (url.length <= 45) return url;
+    try {
+      final uri = Uri.parse(url);
+      final path = uri.path;
+      if (path.length > 15) {
+        return '${uri.scheme}://${uri.host}${path.substring(0, 12)}...';
+      }
+      return '${uri.scheme}://${uri.host}$path';
+    } catch (_) {
+      return '${url.substring(0, 42)}...';
+    }
+  }
+
+  void _launchPreviewUrl(String url) {
+    final uri = Uri.tryParse(url);
+    if (uri != null) {
+      launchUrl(uri, mode: LaunchMode.externalApplication);
+    }
+  }
 }
 
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