improve reverse bang matching

apps/weblibre/lib/features/bangs/data/database/daos/bang.dart

@@ -26,6 +26,7 @@ import 'package:weblibre/features/bangs/data/models/bang.dart';
 import 'package:weblibre/features/bangs/data/models/bang_data.dart';
 import 'package:weblibre/features/bangs/data/models/bang_group.dart';
 import 'package:weblibre/features/bangs/data/models/bang_key.dart';
+import 'package:weblibre/utils/uri_parser.dart';
 
 @DriftAccessor()
 class BangDao extends DatabaseAccessor<BangDatabase> with $BangDaoMixin {
@@ -129,14 +130,19 @@ class BangDao extends DatabaseAccessor<BangDatabase> with $BangDaoMixin {
   }
 
   Selectable<BangData> getBangDataByTemplateHost(String host) {
-    final httpsPrefix = 'https://$host/%';
-    final httpPrefix = 'http://$host/%';
+    // Search engines redirect results between generic subdomains (e.g.
+    // bing.com → www.bing.com, www.youtube.com → m.youtube.com), so match the
+    // template against every equivalent host spelling, not just the live one.
+    final clauses = hostVariants(host)
+        .map(
+          (variant) =>
+              db.bangDataView.urlTemplate.like('https://$variant/%') |
+              db.bangDataView.urlTemplate.like('http://$variant/%'),
+        )
+        .toList();
 
     return select(db.bangDataView)
-      ..where(
-        (t) =>
-            t.urlTemplate.like(httpsPrefix) | t.urlTemplate.like(httpPrefix),
-      );
+      ..where((_) => clauses.reduce((a, b) => a | b));
   }
 
   Selectable<BangData> queryBangs(String searchString) {

apps/weblibre/lib/features/bangs/domain/services/reverse_match.dart

@@ -92,7 +92,7 @@ class BangUrlPattern {
   /// Extracts the user query from [input] if it matches this pattern. Returns
   /// null otherwise.
   String? match(Uri input) {
-    if (input.host.toLowerCase() != host) return null;
+    if (uri_parser.normalizeHost(input.host) != host) return null;
 
     final mainInput = _componentsFromUri(input);
     if (mainInput == null) return null;
@@ -178,7 +178,9 @@ class BangUrlPattern {
     if (!parsed.hasScheme || parsed.host.isEmpty) return null;
     if (parsed.host.contains(_sentinel)) return null;
 
-    final host = parsed.host.toLowerCase();
+    // Normalize so a template host and a redirected results host that differ
+    // only by a generic subdomain (www./m.) still match.
+    final host = uri_parser.normalizeHost(parsed.host);
 
     final fragmentSlot = parsed.fragment.contains(_sentinel);
     final templateMain = _componentsFromUri(parsed);