feat: Add support for double default values

- Add doubleDefaultValue field and doubleFieldDefaultValue() method to Settings
- Add double case in ClassDefinition field generation logic
- Add UI input field for double default values in JsonInputDialog
- Fix existing bugs where bool/int checks used stringFieldDefaultValue()

Fixes issue where double fields didn't get default values when 'set default'
option was enabled, causing inconsistent behavior compared to other primitive types.

Author: iqbalsuperfuture

src/main/kotlin/com/github/zhangruiyu/flutterjsonbeanfactory/action/jsontodart/ClassDefinition.kt

@@ -118,10 +118,12 @@ class ClassDefinition(private val name: String, private val privateFields: Boole
                     } else if (f.subtype == null) {
                         if (f.name == "String" && settings.stringFieldDefaultValue()?.isNotEmpty() == true) {
                             sb.append(" = ${settings.stringFieldDefaultValue()}")
-                        } else if (f.name == "bool" && settings.stringFieldDefaultValue()?.isNotEmpty() == true) {
+                        } else if (f.name == "bool" && settings.boolFieldDefaultValue()?.isNotEmpty() == true) {
                             sb.append(" = ${settings.boolFieldDefaultValue()}")
-                        } else if (f.name == "int" && settings.stringFieldDefaultValue()?.isNotEmpty() == true) {
+                        } else if (f.name == "int" && settings.intFieldDefaultValue()?.isNotEmpty() == true) {
                             sb.append(" = ${settings.intFieldDefaultValue()}")
+                        } else if (f.name == "double" && settings.doubleFieldDefaultValue()?.isNotEmpty() == true) {
+                            sb.append(" = ${settings.doubleFieldDefaultValue()}")
                         }
                     }
                 }

src/main/kotlin/com/github/zhangruiyu/flutterjsonbeanfactory/setting/Settings.kt

@@ -13,6 +13,7 @@ data class Settings(
     var boolDefaultValue: String = "false",
     var stringDefaultValue: String = "''",
     var intDefaultValue: String = "0",
+    var doubleDefaultValue: String = "0.0",
     var listDefaultValue: String = "[]",
 ) : PersistentStateComponent<Settings> {
 
@@ -52,6 +53,14 @@ data class Settings(
         }
     }
 
+    fun doubleFieldDefaultValue(): String? {
+        return if (setDefault == true && doubleDefaultValue.isNotEmpty()) {
+            doubleDefaultValue
+        } else {
+            null
+        }
+    }
+
     fun listFieldDefaultValue(): String? {
         return if (setDefault == true && listDefaultValue.isNotEmpty()) {
             listDefaultValue

src/main/kotlin/com/github/zhangruiyu/flutterjsonbeanfactory/ui/JsonInputDialog.kt

@@ -173,6 +173,11 @@ open class JsonInputDialog(
         }, settings.intDefaultValue).forEach {
             defaultContainer.add(it)
         }
+        buildDefaultItem("double", { newText ->
+            settings.doubleDefaultValue = newText
+        }, settings.doubleDefaultValue).forEach {
+            defaultContainer.add(it)
+        }
         buildDefaultItem("bool", { newText ->
             settings.boolDefaultValue = newText
         }, settings.boolDefaultValue).forEach {