✨ Link preview

lib/providers/link_preview.dart

@@ -0,0 +1,35 @@
+import 'dart:convert';
+import 'dart:developer';
+
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:surface/providers/sn_network.dart';
+import 'package:surface/types/link.dart';
+
+class SnLinkPreviewProvider {
+  late final SnNetworkProvider _sn;
+
+  final Map<String, SnLinkMeta> _cache = {};
+
+  SnLinkPreviewProvider(BuildContext context) {
+    _sn = context.read<SnNetworkProvider>();
+  }
+
+  Future<SnLinkMeta?> getLinkMeta(String url) async {
+    final b64 = utf8.fuse(base64Url);
+    final target = b64.encode(url);
+    if (_cache.containsKey(target)) return _cache[target];
+
+    log('[LinkPreview] Fetching $url ($target)');
+
+    try {
+      final resp = await _sn.client.get('/cgi/re/link/$target');
+      final meta = SnLinkMeta.fromJson(resp.data);
+      _cache[url] = meta;
+      return meta;
+    } catch (err) {
+      log('[LinkPreview] Failed to fetch $url ($target)');
+      return null;
+    }
+  }
+}