feat: 글래스모피즘 디자인 시스템 및 색상 가이드 전면 적용

- @doc/color.md 가이드라인에 따른 색상 시스템 전면 개편
- 딥 블루(#2563EB), 스카이 블루(#60A5FA) 메인 컬러로 변경
- 모든 화면과 위젯에 글래스모피즘 효과 일관성 있게 적용
- darkNavy, navyGray 등 새로운 텍스트 색상 체계 도입
- 공통 스낵바 및 다이얼로그 컴포넌트 추가
- Claude AI 프로젝트 컨텍스트 파일(CLAUDE.md) 추가

영향받은 컴포넌트:
- 10개 스크린 (main, settings, detail, splash 등)
- 30개 이상 위젯 (buttons, cards, forms 등)
- 테마 시스템 (AppColors, AppTheme)

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

lib/widgets/common/form_fields/base_text_field.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import '../../../theme/app_colors.dart';
 
 /// 공통 텍스트 필드 위젯
 /// 프로젝트 전체에서 일관된 스타일의 텍스트 입력 필드를 제공합니다.
@@ -68,7 +69,7 @@ class BaseTextField extends StatelessWidget {
             style: TextStyle(
               fontSize: 16,
               fontWeight: FontWeight.w600,
-              color: theme.colorScheme.onSurface,
+              color: AppColors.textSecondary,
             ),
           ),
           const SizedBox(height: 8),
@@ -91,18 +92,18 @@ class BaseTextField extends StatelessWidget {
           cursorColor: cursorColor ?? theme.primaryColor,
           style: style ?? TextStyle(
             fontSize: 16,
-            color: theme.colorScheme.onSurface,
+            color: AppColors.textPrimary,
           ),
           decoration: InputDecoration(
             hintText: hintText,
             hintStyle: TextStyle(
-              color: theme.colorScheme.onSurface.withOpacity(0.6),
+              color: AppColors.textMuted,
             ),
             prefixIcon: prefixIcon,
             prefixText: prefixText,
             suffixIcon: suffixIcon,
             filled: true,
-            fillColor: fillColor ?? Colors.white,
+            fillColor: fillColor ?? AppColors.glassBackground,
             contentPadding: contentPadding ?? const EdgeInsets.all(16),
             border: OutlineInputBorder(
               borderRadius: BorderRadius.circular(16),
@@ -117,7 +118,10 @@ class BaseTextField extends StatelessWidget {
             ),
             enabledBorder: OutlineInputBorder(
               borderRadius: BorderRadius.circular(16),
-              borderSide: BorderSide.none,
+              borderSide: BorderSide(
+                color: AppColors.textSecondary,
+                width: 1,
+              ),
             ),
             disabledBorder: OutlineInputBorder(
               borderRadius: BorderRadius.circular(16),

lib/widgets/common/form_fields/date_picker_field.dart

@@ -68,7 +68,6 @@ class DatePickerField extends StatelessWidget {
                       surface: Colors.white,
                       onSurface: Colors.black,
                     ),
-                    dialogBackgroundColor: Colors.white,
                   ),
                   child: child!,
                 );
@@ -98,7 +97,7 @@ class DatePickerField extends StatelessWidget {
                       fontSize: 16,
                       color: enabled 
                         ? theme.colorScheme.onSurface 
-                        : theme.colorScheme.onSurface.withOpacity(0.5),
+                        : theme.colorScheme.onSurface.withValues(alpha: 0.5),
                     ),
                   ),
                 ),
@@ -106,8 +105,8 @@ class DatePickerField extends StatelessWidget {
                   Icons.calendar_today,
                   size: 20,
                   color: enabled 
-                    ? theme.colorScheme.onSurface.withOpacity(0.6)
-                    : theme.colorScheme.onSurface.withOpacity(0.3),
+                    ? theme.colorScheme.onSurface.withValues(alpha: 0.6)
+                    : theme.colorScheme.onSurface.withValues(alpha: 0.3),
                 ),
               ],
             ),
@@ -214,7 +213,6 @@ class _DateRangeItem extends StatelessWidget {
                   surface: Colors.white,
                   onSurface: Colors.black,
                 ),
-                dialogBackgroundColor: Colors.white,
               ),
               child: child!,
             );
@@ -239,7 +237,7 @@ class _DateRangeItem extends StatelessWidget {
               label,
               style: TextStyle(
                 fontSize: 12,
-                color: theme.colorScheme.onSurface.withOpacity(0.6),
+                color: theme.colorScheme.onSurface.withValues(alpha: 0.6),
               ),
             ),
             const SizedBox(height: 4),
@@ -252,7 +250,7 @@ class _DateRangeItem extends StatelessWidget {
                 fontWeight: FontWeight.w500,
                 color: date != null
                     ? theme.colorScheme.onSurface
-                    : theme.colorScheme.onSurface.withOpacity(0.4),
+                    : theme.colorScheme.onSurface.withValues(alpha: 0.4),
               ),
             ),
           ],