feat(qol): add smart tag actions, universal zoom, scroll-to-top, desktop hotkeys, and Pawchive provider

lib/shared/widgets/tag_chip.dart

@@ -1,15 +1,21 @@
 import 'package:flutter/material.dart';
 
 class TagChip extends StatelessWidget {
-  const TagChip({required this.tag, this.onTap, super.key});
+  const TagChip({
+    required this.tag,
+    this.onTap,
+    this.onLongPress,
+    super.key,
+  });
 
   final String tag;
   final VoidCallback? onTap;
+  final VoidCallback? onLongPress;
 
   @override
   Widget build(BuildContext context) {
     final scheme = Theme.of(context).colorScheme;
-    return ActionChip(
+    final chip = ActionChip(
       onPressed: onTap,
       label: Text(tag),
       labelStyle: TextStyle(
@@ -20,5 +26,11 @@ class TagChip extends StatelessWidget {
       side: BorderSide(color: scheme.outlineVariant.withValues(alpha: 0.65)),
       visualDensity: VisualDensity.compact,
     );
+    if (onLongPress == null) return chip;
+    return GestureDetector(
+      behavior: HitTestBehavior.opaque,
+      onLongPress: onLongPress,
+      child: chip,
+    );
   }
 }