fix(flutter): 剧场搜索框改为浅灰胶囊

lib/pages/discover/widgets/discover_search_field.dart

@@ -5,11 +5,14 @@ import 'package:flutter/material.dart';
 import '../../../core/theme/app_colors.dart';
 import '../../../l10n/app_localizations.dart';
 
-const double _searchHeight = 40;
-const double _searchRadius = 20;
+const double _searchHeight = 44;
+const double _searchRadius = 22;
+const double _searchPadding = 14;
+const double _iconSize = 18;
+const double _iconGap = 8;
 const Duration _focusTransition = Duration(milliseconds: 160);
 
-/// 剧场顶部整行搜索框：白底细边，聚焦时主题色描边与更深的阴影。
+/// 剧场顶部整行搜索框：浅灰胶囊，聚焦时变白并显示主题色描边。
 class DiscoverSearchField extends StatefulWidget {
   const DiscoverSearchField({
     super.key,
@@ -69,57 +72,62 @@ class _DiscoverSearchFieldState extends State<DiscoverSearchField> {
         duration: _focusTransition,
         curve: Curves.easeOut,
         height: _searchHeight,
+        padding: const EdgeInsets.symmetric(horizontal: _searchPadding),
         decoration: BoxDecoration(
-          color: AppColors.card,
+          color: _focused ? AppColors.card : AppColors.commentInput,
           borderRadius: BorderRadius.circular(_searchRadius),
           border: Border.all(
-            color: _focused ? AppColors.blue : AppColors.border,
+            color: _focused ? AppColors.blue : Colors.transparent,
           ),
-          boxShadow: [
-            BoxShadow(
-              color: _focused
-                  ? AppColors.blue.withValues(alpha: 0.18)
-                  : Colors.black.withValues(alpha: 0.04),
-              blurRadius: _focused ? 10 : 4,
-              offset: const Offset(0, 2),
-            ),
-          ],
         ),
-        child: TextField(
-          key: const Key('discover-search'),
-          controller: widget.controller,
-          focusNode: widget.focusNode,
-          onChanged: widget.onChanged,
-          onTapOutside: (_) => widget.focusNode.unfocus(),
-          textInputAction: TextInputAction.search,
-          style: const TextStyle(color: AppColors.onSurface, fontSize: 14),
-          decoration: InputDecoration(
-            isDense: true,
-            filled: false,
-            hintText: AppLocalizations.of(context)!.searchDiscover,
-            hintStyle: const TextStyle(color: AppColors.subtle, fontSize: 13.5),
-            prefixIcon: const Icon(
+        child: Row(
+          children: [
+            const Icon(
               Icons.search_rounded,
               color: AppColors.subtle,
-              size: 17,
+              size: _iconSize,
             ),
-            suffixIcon: widget.loading
-                ? const SizedBox.square(
-                    dimension: 18,
-                    child: Center(
-                      child: CircularProgressIndicator(strokeWidth: 2),
-                    ),
-                  )
-                : null,
-            suffixIconConstraints: const BoxConstraints(
-              minWidth: 0,
-              minHeight: 0,
+            const SizedBox(width: _iconGap),
+            Expanded(
+              child: TextField(
+                key: const Key('discover-search'),
+                controller: widget.controller,
+                focusNode: widget.focusNode,
+                onChanged: widget.onChanged,
+                onTapOutside: (_) => widget.focusNode.unfocus(),
+                textInputAction: TextInputAction.search,
+                textAlignVertical: TextAlignVertical.center,
+                style: const TextStyle(
+                  color: AppColors.onSurface,
+                  fontSize: 14,
+                ),
+                decoration: InputDecoration(
+                  isDense: true,
+                  hintText: AppLocalizations.of(context)!.searchDiscover,
+                  hintStyle: const TextStyle(
+                    color: AppColors.subtle,
+                    fontSize: 14,
+                  ),
+                  border: InputBorder.none,
+                  enabledBorder: InputBorder.none,
+                  focusedBorder: InputBorder.none,
+                  contentPadding: EdgeInsets.zero,
+                  suffixIcon: widget.loading
+                      ? const SizedBox.square(
+                          dimension: 18,
+                          child: Center(
+                            child: CircularProgressIndicator(strokeWidth: 2),
+                          ),
+                        )
+                      : null,
+                  suffixIconConstraints: const BoxConstraints(
+                    minWidth: 0,
+                    minHeight: 0,
+                  ),
+                ),
+              ),
             ),
-            contentPadding: const EdgeInsets.symmetric(horizontal: 12),
-            border: InputBorder.none,
-            enabledBorder: InputBorder.none,
-            focusedBorder: InputBorder.none,
-          ),
+          ],
         ),
       ),
     );

test/discover/home_all_dramas_grid_test.dart

@@ -182,12 +182,18 @@ void main() {
                 .decoration!
             as BoxDecoration;
 
-    expect(shell().borderRadius, BorderRadius.circular(20));
-    expect((shell().border! as Border).top.color, AppColors.border);
+    expect(shell().borderRadius, BorderRadius.circular(22));
+    expect(shell().color, AppColors.commentInput);
+    expect((shell().border! as Border).top.color, Colors.transparent);
+    expect(
+      tester.getSize(find.byKey(const Key('discover-search-shell'))).height,
+      44,
+    );
 
     await tester.tap(find.byKey(const Key('discover-search')));
     await tester.pump(const Duration(milliseconds: 200));
 
+    expect(shell().color, AppColors.card);
     expect((shell().border! as Border).top.color, AppColors.blue);
   });