feat: support old title placeholder in title prompts

app/gui/tabs/generate.py

@@ -61,6 +61,8 @@ class GenerateTab(QWidget):
             prompts.load_title_prompt(self.title_prompt_path)
         )
         self.save_title_button = QPushButton("保存标题提示词")
+        self.insert_old_title_button = QPushButton("插入旧标题")
+        self.insert_old_title_button.setObjectName("insertOldTitleButton")
         self.cover_prompt_edit = QPlainTextEdit()
         self.cover_prompt_edit.setObjectName("coverPromptEdit")
         self.cover_prompt_edit.setPlaceholderText("封面提示词")
@@ -115,7 +117,11 @@ class GenerateTab(QWidget):
         left_layout.setContentsMargins(0, 0, 12, 0)
         left_layout.addWidget(QLabel("标题提示词"))
         left_layout.addWidget(self.title_prompt_edit, 1)
-        left_layout.addWidget(self.save_title_button)
+        title_action_layout = QHBoxLayout()
+        title_action_layout.addWidget(self.save_title_button)
+        title_action_layout.addWidget(self.insert_old_title_button)
+        title_action_layout.addStretch(1)
+        left_layout.addLayout(title_action_layout)
         left_layout.addWidget(QLabel("封面提示词"))
         left_layout.addWidget(self.cover_template_combo)
         cover_template_layout = QHBoxLayout()
@@ -230,6 +236,7 @@ class GenerateTab(QWidget):
         self.status_filter.currentIndexChanged.connect(self.refresh_tasks)
         self.refresh_button.clicked.connect(self.refresh_tasks)
         self.save_title_button.clicked.connect(self.save_title_prompt)
+        self.insert_old_title_button.clicked.connect(self.insert_old_title_placeholder)
         self.cover_template_combo.currentIndexChanged.connect(self.load_selected_cover_template)
         self.new_cover_template_button.clicked.connect(self.new_cover_template)
         self.save_cover_template_button.clicked.connect(self.save_cover_template)
@@ -454,6 +461,9 @@ class GenerateTab(QWidget):
     def insert_title_placeholder(self, checked=False):
         self.cover_prompt_edit.insertPlainText("{新标题}")
 
+    def insert_old_title_placeholder(self, checked=False):
+        self.title_prompt_edit.insertPlainText("{旧标题}")
+
     def preview_cover_prompt(self, checked=False):
         task = self._selected_task()
         if task is None: