refactor!: 完成 0.4.0 版本更新

完成 0.4.0 版本更新, 为了消除此前提交消息风格不一致与错误提交超大文件的问题, 维持代码统计数据的准确性和提交消息风格的一致性, 重新初始化仓库; 旧的提交历史在 HeurAMS-legacy 仓库(https://gitea.imwangzhiyu.xyz/ajax/HeurAMS-legacy)

BREAKING CHANGE: 略

src/heurams/interface/widgets/placeholder.py

@@ -0,0 +1,33 @@
+from textual.widgets import (
+    Label,
+    Button,
+)
+from textual.widget import Widget
+
+
+class Placeholder(Widget):
+    def __init__(
+        self,
+        *children: Widget,
+        name: str | None = None,
+        alia: str = "",
+        id: str | None = None,
+        classes: str | None = None,
+        disabled: bool = False,
+        markup: bool = True
+    ) -> None:
+        super().__init__(
+            *children,
+            name=name,
+            id=id,
+            classes=classes,
+            disabled=disabled,
+            markup=markup
+        )
+
+    def compose(self):
+        yield Label("示例标签", id="testlabel")
+        yield Button("示例按钮", id="testbtn", classes="choice")
+
+    def on_button_pressed(self, event):
+        pass