chore: 更新国际化翻译及 UI 组件优化

apps/lib/features/home/presentation/widgets/home_floating_header.dart

@@ -1,10 +1,13 @@
 import 'package:flutter/material.dart';
 import 'package:lucide_icons/lucide_icons.dart';
 
+import '../../../../core/l10n/l10n.dart';
 import '../../../../core/theme/design_tokens.dart';
 
 const homeFloatingHeaderKey = ValueKey('home_floating_header');
 const homeFloatingHeaderTitleKey = ValueKey('home_floating_header_title');
+const _actionSlotWidth =
+    (AppSpacing.xxl + AppSpacing.lg) * 2 + AppSpacing.sm + AppSpacing.sm;
 
 class HomeFloatingHeader extends StatelessWidget {
   const HomeFloatingHeader({
@@ -33,52 +36,66 @@ class HomeFloatingHeader extends StatelessWidget {
         AppSpacing.xs,
       ),
       decoration: BoxDecoration(
-        color: colorScheme.surface.withValues(alpha: 0.95),
-        border: Border(bottom: BorderSide(color: colorScheme.outlineVariant)),
+        color: colorScheme.surface.withValues(alpha: 0.92),
+        border: Border(
+          bottom: BorderSide(
+            color: colorScheme.outlineVariant.withValues(alpha: 0.65),
+          ),
+        ),
+        boxShadow: [
+          BoxShadow(
+            color: colorScheme.shadow.withValues(alpha: 0.04),
+            blurRadius: AppSpacing.xl,
+            offset: const Offset(AppSpacing.none, AppSpacing.xs),
+          ),
+        ],
       ),
-      child: Stack(
-        alignment: Alignment.center,
+      child: Row(
+        crossAxisAlignment: CrossAxisAlignment.center,
         children: [
-          Row(
-            mainAxisAlignment: MainAxisAlignment.spaceBetween,
-            crossAxisAlignment: CrossAxisAlignment.center,
-            children: [
-              _HeaderIconButton(
+          SizedBox(
+            width: _actionSlotWidth,
+            child: Align(
+              alignment: Alignment.centerLeft,
+              child: _HeaderIconButton(
                 icon: LucideIcons.settings,
                 onPressed: onTapSettings,
               ),
-              Row(
-                crossAxisAlignment: CrossAxisAlignment.center,
-                children: [
-                  _HeaderIconButton(
-                    icon: LucideIcons.calendar,
-                    onPressed: onTapCalendar,
-                  ),
-                  const SizedBox(width: AppSpacing.sm),
-                  _MessagesButton(
-                    unreadCount: unreadCount,
-                    onPressed: onTapMessages,
-                  ),
-                ],
-              ),
-            ],
+            ),
           ),
-          IgnorePointer(
-            child: Padding(
-              padding: EdgeInsets.symmetric(horizontal: AppSpacing.xl * 3),
-              child: Text(
-                'Linksy',
-                key: homeFloatingHeaderTitleKey,
-                maxLines: 1,
-                overflow: TextOverflow.ellipsis,
-                style: TextStyle(
-                  fontSize: AppSpacing.lg + (AppSpacing.xs / 2),
-                  fontWeight: FontWeight.w600,
-                  color: colorScheme.onSurface,
-                ),
+          Expanded(
+            child: Text(
+              context.l10n.appTitle,
+              key: homeFloatingHeaderTitleKey,
+              maxLines: 1,
+              textAlign: TextAlign.center,
+              overflow: TextOverflow.ellipsis,
+              style: TextStyle(
+                fontSize: AppSpacing.lg,
+                fontWeight: FontWeight.w700,
+                letterSpacing: 0.2,
+                color: colorScheme.onSurface,
               ),
             ),
           ),
+          SizedBox(
+            width: _actionSlotWidth,
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.end,
+              crossAxisAlignment: CrossAxisAlignment.center,
+              children: [
+                _HeaderIconButton(
+                  icon: LucideIcons.calendar,
+                  onPressed: onTapCalendar,
+                ),
+                const SizedBox(width: AppSpacing.sm),
+                _MessagesButton(
+                  unreadCount: unreadCount,
+                  onPressed: onTapMessages,
+                ),
+              ],
+            ),
+          ),
         ],
       ),
     );
@@ -103,7 +120,11 @@ class _HeaderIconButton extends StatelessWidget {
         minHeight: AppSpacing.xxl + AppSpacing.lg,
       ),
       onPressed: onPressed,
-      icon: Icon(icon, size: AppSpacing.xxl, color: colorScheme.onSurface),
+      icon: Icon(
+        icon,
+        size: AppSpacing.xxl,
+        color: colorScheme.onSurface.withValues(alpha: 0.95),
+      ),
     );
   }
 }
@@ -145,7 +166,11 @@ class _MessagesButton extends StatelessWidget {
                 ),
                 decoration: BoxDecoration(
                   color: colorScheme.error,
-                  borderRadius: BorderRadius.circular(AppSpacing.sm),
+                  borderRadius: BorderRadius.circular(AppSpacing.md),
+                  border: Border.all(
+                    color: colorScheme.surface,
+                    width: AppSpacing.xs / 2,
+                  ),
                 ),
                 constraints: const BoxConstraints(
                   minWidth: AppSpacing.lg,