fix(theme): 修复死锁、冗余读取、空作者字符串等交叉审查问题

- ThemeManager 拆分 _removeThemeFile 无锁版本, 消除 importTheme 持锁
  时调用 removeTheme 导致的死锁
- validateTheme 增加 check_qss 参数, listThemes 跳过 QSS 读取
- validateTheme 拒绝空/空白作者字符串, 避免 info.json 与文件名不一致
- 统一默认作者为 "未知作者"
- ALSettingsWidget.ui 增加删除按钮 [-], 浏览按钮改为 [+]
- ALSettingsWidget 实现 onRemoveThemeButtonClicked 删除逻辑

src/gui/ALSettingsWidget.py

@@ -139,6 +139,7 @@ class ALSettingsWidget(QWidget, Ui_ALSettingsWidget):
     ):
 
         self.BrowseQssButton.clicked.connect(self.onImportThemeButtonClicked)
+        self.RemoveThemeButton.clicked.connect(self.onRemoveThemeButtonClicked)
         self.ThemeComboBox.currentIndexChanged.connect(self.onThemeComboBoxChanged)
         self.ResetThemeButton.clicked.connect(self.onResetThemeButtonClicked)
         self.CancelButton.clicked.connect(self.onCancelButtonClicked)
@@ -225,7 +226,7 @@ class ALSettingsWidget(QWidget, Ui_ALSettingsWidget):
         t = self.__theme_cache.get(file)
         if t:
             name = t.get("name", "未知")
-            author = t.get("author", "未知")
+            author = t.get("author", "未知作者")
             need_theme = t.get("need_theme", "both")
             brief = t.get("brief", "没有相关简介")
             self.ThemeInfoLabel.setText(
@@ -318,13 +319,46 @@ class ALSettingsWidget(QWidget, Ui_ALSettingsWidget):
             author = t.get("author", "")
             if name:
                 self.__theme_cache[file] = t
-                if author and author != "未知":
+                self.ThemeComboBox.addItem(name, file)
-                    display = f"{name} ({author})"
-                else:
-                    display = name
-                self.ThemeComboBox.addItem(display, file)
         self.ThemeComboBox.blockSignals(False)
 
+    @Slot()
+    def onRemoveThemeButtonClicked(
+        self
+    ):
+
+        file = self.ThemeComboBox.currentData()
+        if not file:
+            QMessageBox.information(
+                self,
+                "提示 - AutoLibrary",
+                "请先选择一个主题。"
+            )
+            return
+        t = self.__theme_cache.get(file)
+        name = t.get("name", file) if t else file
+        reply = QMessageBox.question(
+            self,
+            "删除主题 - AutoLibrary",
+            f"确定要删除主题 \"{name}\" 吗？",
+            QMessageBox.Yes | QMessageBox.No,
+            QMessageBox.No
+        )
+        if reply != QMessageBox.Yes:
+            return
+        try:
+            themeInstance().removeTheme(file)
+            self.populateThemeList()
+            self.ThemeComboBox.setCurrentIndex(0)
+            self.updateThemeStatus()
+            self.updateThemeInfo()
+        except Exception as e:
+            QMessageBox.warning(
+                self,
+                "删除失败 - AutoLibrary",
+                f"无法删除主题：{e}"
+            )
+
     @Slot()
     def onImportThemeButtonClicked(
         self

src/gui/resources/ui/ALSettingsWidget.ui

@@ -328,7 +328,26 @@
                </size>
               </property>
               <property name="text">
-               <string>...</string>
+               <string>+</string>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <widget class="QPushButton" name="RemoveThemeButton">
+              <property name="minimumSize">
+               <size>
+                <width>25</width>
+                <height>25</height>
+               </size>
+              </property>
+              <property name="maximumSize">
+               <size>
+                <width>25</width>
+                <height>25</height>
+               </size>
+              </property>
+              <property name="text">
+               <string>-</string>
               </property>
              </widget>
             </item>

src/managers/theme/ThemeManager.py

@@ -121,7 +121,7 @@ class ThemeManager:
             existing_info = validateTheme(default_path)
             existing_author = existing_info.get("author", "")
         except Exception:
-            self.removeTheme(theme_name)
+            self._removeThemeFile(theme_name)  # caller holds the lock
             raise ValueError(
                 f"主题 '{theme_name}' 已存在但无法通过验证, 已清理该主题文件"
             )
@@ -129,7 +129,7 @@ class ThemeManager:
             raise ValueError(
                 f"主题名称 '{theme_name}' (作者 '{author}') 已存在"
             )
-        safe_author = os.path.basename(author) if author else "未知"
+        safe_author = os.path.basename(author) if author else "未知作者"
         alt_path = os.path.join(
             self.__themes_dir, f"{theme_name}_{safe_author}.altheme"
         )
@@ -168,7 +168,7 @@ class ThemeManager:
         with self.__lock:
             if ext == ".qss":
                 name = os.path.splitext(os.path.basename(source_path))[0]
-                dest_path = self._resolveDestPath(name, "未知")
+                dest_path = self._resolveDestPath(name, "未知作者")
                 wrapQssToAtheme(source_path, dest_path, "both")
                 return os.path.splitext(os.path.basename(dest_path))[0]
             elif ext == ".altheme":
@@ -203,7 +203,7 @@ class ThemeManager:
             if filename.endswith(".altheme"):
                 filepath = os.path.join(self.__themes_dir, filename)
                 try:
-                    info = validateTheme(filepath)
+                    info = validateTheme(filepath, check_qss=False)  # skip QSS read for list scan
                     name = info.get("name", "")
                     author = info.get("author", "")
                     key = (name, author)
@@ -225,6 +225,26 @@ class ThemeManager:
                 )
         return themes
 
+    def _removeThemeFile(
+        self,
+        name: str
+    ):
+        """
+            Remove a theme file without locking.
+
+            The caller must hold self.__lock before invoking this method.
+        """
+
+        filepath = os.path.join(self.__themes_dir, name + ".altheme")
+        if os.path.isfile(filepath):
+            os.remove(filepath)
+            if self.__current_theme_name == name:
+                self.__current_theme_name = ""
+                saved_theme = configInstance().get(
+                    CfgKey.GLOBAL.APPEARANCE.THEME, "system"
+                )
+                self.clearTheme(saved_theme)
+
     def removeTheme(
         self,
         name: str
@@ -239,16 +259,8 @@ class ThemeManager:
                 name (str): The theme name to remove.
         """
 
-        filepath = os.path.join(self.__themes_dir, name + ".altheme")
         with self.__lock:
-            if os.path.isfile(filepath):
+            self._removeThemeFile(name)
-                os.remove(filepath)
-                if self.__current_theme_name == name:
-                    self.__current_theme_name = ""
-                    saved_theme = configInstance().get(
-                        CfgKey.GLOBAL.APPEARANCE.THEME, "system"
-                    )
-                    self.clearTheme(saved_theme)
 
     def applyTheme(
         self,

src/utils/ThemeUtils.py

@@ -117,7 +117,8 @@ def readThemeQss(
         return zf.read("theme.qss").decode("utf-8")
 
 def validateTheme(
-    altheme_path: str
+    altheme_path: str,
+    check_qss: bool = True
 ) -> dict:
     """
         Validate a .altheme file and return its metadata.
@@ -128,6 +129,8 @@ def validateTheme(
 
         Args:
             altheme_path (str): Path to the .altheme file.
+            check_qss (bool): If False, skip theme.qss existence and
+                              content checks (for list-only operations).
 
         Returns:
             dict: The validated theme metadata dictionary.
@@ -146,14 +149,16 @@ def validateTheme(
         if "theme.qss" not in names:
             raise ValueError("无效的 .altheme: 缺少 theme.qss")
         info_bytes = zf.read("info.json")
-        qss_bytes = zf.read("theme.qss")
+        qss_bytes = zf.read("theme.qss") if check_qss else None  # skip QSS read when only listing
     try:
         info = json.loads(info_bytes.decode("utf-8"))
     except (json.JSONDecodeError, UnicodeDecodeError) as e:
         raise ValueError(f"无效的 .altheme: info.json 解析失败 — {e}")
     if "name" not in info or not isinstance(info.get("name"), str) or not info["name"].strip():
         raise ValueError("无效的 .altheme: info.json 缺少有效的 'name' 字段")
-    if "author" not in info or not isinstance(info.get("author"), str):
+    # reject blank author so info.json does not drift from the "未知作者" filename fallback
+    if ("author" not in info or not isinstance(info.get("author"), str)
+            or not info["author"].strip()):
         raise ValueError("无效的 .altheme: info.json 缺少有效的 'author' 字段")
     need_theme = info.get("need_theme", "both")
     if need_theme not in ("light", "dark", "both"):
@@ -163,7 +168,7 @@ def validateTheme(
         )
     if "brief" not in info or not isinstance(info.get("brief"), str):
         raise ValueError("无效的 .altheme: info.json 缺少有效的 'brief' 字段")
-    if not qss_bytes.strip():
+    if check_qss and not qss_bytes.strip():
         raise ValueError("无效的 .altheme: theme.qss 为空")
     return info
 
@@ -191,7 +196,7 @@ def wrapQssToAtheme(
     filename = os.path.splitext(os.path.basename(qss_path))[0]
     info = {
         "name": filename,
-        "author": "未知",
+        "author": "未知作者",
         "need_theme": current_theme,
         "brief": "没有相关简介"
     }