add in-memory tile cache, tile fade transitions, and performance HUD to map page

lib/pages/map/tiles/hive_tile_image.dart

@@ -4,9 +4,10 @@ import 'package:flutter/material.dart';
 import 'package:rra_app/pages/map/tiles/hive_tile_cache.dart';
 
 class HiveTileImage extends StatefulWidget {
-  const HiveTileImage({required this.url, super.key});
+  const HiveTileImage({required this.url, this.onLoaded, super.key});
 
   final String url;
+  final ValueChanged<String>? onLoaded;
 
   @override
   State<HiveTileImage> createState() => _HiveTileImageState();
@@ -15,18 +16,30 @@ class HiveTileImage extends StatefulWidget {
 class _HiveTileImageState extends State<HiveTileImage> {
   Uint8List? _bytes;
   String? _loadingUrl;
+  bool _reportedLoaded = false;
 
   @override
   void initState() {
     super.initState();
-    _load(widget.url);
+    _bytes = HiveTileCache.peek(widget.url);
+    if (_bytes != null && _bytes!.isNotEmpty) {
+      _reportLoaded();
+    } else {
+      _load(widget.url);
+    }
   }
 
   @override
   void didUpdateWidget(covariant HiveTileImage oldWidget) {
     super.didUpdateWidget(oldWidget);
     if (oldWidget.url != widget.url) {
-      _load(widget.url);
+      _reportedLoaded = false;
+      _bytes = HiveTileCache.peek(widget.url);
+      if (_bytes != null && _bytes!.isNotEmpty) {
+        _reportLoaded();
+      } else {
+        _load(widget.url);
+      }
     }
   }
 
@@ -38,20 +51,29 @@ class _HiveTileImageState extends State<HiveTileImage> {
       setState(() {
         _bytes = bytes;
       });
+      _reportLoaded();
     }
   }
 
+  void _reportLoaded() {
+    if (_reportedLoaded) return;
+    _reportedLoaded = true;
+    widget.onLoaded?.call(widget.url);
+  }
+
   @override
   Widget build(BuildContext context) {
     final bytes = _bytes;
     if (bytes == null || bytes.isEmpty) {
-      return const ColoredBox(color: Color(0xFFE0E0E0));
+      return const ColoredBox(color: Colors.transparent);
     }
+    _reportLoaded();
     return Image.memory(
       bytes,
+      scale: widget.url.contains('@2x') ? 2.0 : 1.0,
       fit: BoxFit.cover,
       gaplessPlayback: true,
-      filterQuality: FilterQuality.low,
+      filterQuality: FilterQuality.medium,
     );
   }
 }