refactor(style): 统一项目代码风格，整理导入顺序、间距规范与方法排列

- GUI 模块统一 QtCore → QtGui → QtWidgets 导入排列，各类独占一行按字母排序
- 统一类间两空行、类内方法间一空行、函数间一空行的间距规范
- 统一方法排列顺序：__init__ → setupUi → connectSignals → public → Slot → private
- 统一 _widgets 中 ConditionRowFrame/ActionStepFrame 方法命名（populate* / toScript / updateValueWidget）
- LibTimeSelector 迁入 operators/abs 抽象层

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/gui/ALTimerTaskHistoryDialog.py

@@ -34,7 +34,6 @@ class ALTimerTaskHistoryDialog(QDialog):
         self.setupUi()
         self.connectSignals()
 
-
     def setupUi(
         self
     ):
@@ -82,7 +81,6 @@ class ALTimerTaskHistoryDialog(QDialog):
         ButtonLayout.addWidget(self.CloseButton)
         MainLayout.addLayout(ButtonLayout)
 
-
     def connectSignals(
         self
     ):
@@ -90,7 +88,6 @@ class ALTimerTaskHistoryDialog(QDialog):
         self.CloseButton.clicked.connect(self.accept)
         self.ClearHistoryButton.clicked.connect(self.onClearHistoryButtonClicked)
 
-
     def loadHistory(
         self
     ):
@@ -99,6 +96,11 @@ class ALTimerTaskHistoryDialog(QDialog):
         for row, record in enumerate(self.__history):
             self.addHistoryRow(row, record)
 
+    def getHistory(
+        self
+    ) -> list:
+
+        return self.__history
 
     def addHistoryRow(
         self,
@@ -129,13 +131,6 @@ class ALTimerTaskHistoryDialog(QDialog):
         self.HistoryTableWidget.setItem(row, 2, DurationItem)
         self.HistoryTableWidget.setRowHeight(row, 25)
 
-
-    def getHistory(
-        self
-    ) -> list:
-
-        return self.__history
-
     @Slot()
     def onClearHistoryButtonClicked(
         self