feat(ui): 添加深色模式支持

- 新增深色/浅色模式切换按钮，位于主窗口底部
- 在配置文件中定义主题颜色（浅色/深色背景、列表背景、前景色）
- 更新 UI 工具函数以支持动态主题切换，包括列表斑马纹适配
- 添加翻译条目（Dark Mode/Light Mode）并更新编译脚本
- 修改主窗口创建逻辑，集成主题切换回调
- 调整列表背景色属性从 BACKCOLOR 改为 BGCOLOR 以保持一致性

po/compile_mo.py

@@ -0,0 +1,67 @@
+import struct, re, os
+
+def compile_po_to_mo(po_path, mo_path):
+    with open(po_path, 'r', encoding='utf-8') as f:
+        content = f.read()
+
+    entries = []
+    for match in re.finditer(
+        r'msgid "(.+?)"\s*\nmsgstr "(.*?)"',
+        content, re.DOTALL
+    ):
+        msgid = match.group(1)
+        msgstr = match.group(2)
+        if msgid:
+            entries.append((msgid, msgstr))
+
+    if not entries:
+        print(f'No entries in {po_path}')
+        return
+
+    N = len(entries)
+    header_sz = 28
+    table_sz = N * 8 * 2
+
+    orig_off = header_sz + table_sz
+    orig_data = b''
+    orig_offsets = []
+    for eid, estr in entries:
+        orig_offsets.append(len(orig_data))
+        orig_data += eid.encode('utf-8') + b'\x00'
+
+    trans_off = orig_off + len(orig_data)
+    trans_data = b''
+    trans_offsets = []
+    for eid, estr in entries:
+        trans_offsets.append(len(trans_data))
+        trans_data += estr.encode('utf-8') + b'\x00'
+
+    buf = bytearray()
+    buf += struct.pack('<I', 0x950412de)
+    buf += struct.pack('<I', 0)
+    buf += struct.pack('<I', N)
+    buf += struct.pack('<I', orig_off)
+    buf += struct.pack('<I', trans_off)
+    buf += struct.pack('<I', 0)
+    buf += struct.pack('<I', 0)
+
+    for i in range(N):
+        buf += struct.pack('<II', len(entries[i][0].encode('utf-8')), orig_offsets[i])
+    for i in range(N):
+        buf += struct.pack('<II', len(entries[i][1].encode('utf-8')), trans_offsets[i])
+
+    buf += orig_data
+    buf += trans_data
+
+    os.makedirs(os.path.dirname(mo_path), exist_ok=True)
+    with open(mo_path, 'wb') as f:
+        f.write(buf)
+    print(f'{po_path} -> {mo_path}  ({N} strings)')
+
+base = os.path.dirname(os.path.abspath(__file__))
+root = os.path.dirname(base)
+
+compile_po_to_mo(os.path.join(root, 'po', 'zh_CN.po'), os.path.join(root, 'locale', 'zh_CN', 'LC_MESSAGES', 'zh_CN.mo'))
+compile_po_to_mo(os.path.join(root, 'po', 'en_US.po'), os.path.join(root, 'locale', 'en_US', 'LC_MESSAGES', 'en_US.mo'))
+compile_po_to_mo(os.path.join(root, 'po', 'zh_CN.po'), os.path.join(root, 'build', 'locale', 'zh_CN', 'LC_MESSAGES', 'zh_CN.mo'))
+compile_po_to_mo(os.path.join(root, 'po', 'en_US.po'), os.path.join(root, 'build', 'locale', 'en_US', 'LC_MESSAGES', 'en_US.mo'))

po/en_US.po

@@ -406,4 +406,12 @@ msgstr "Please select an item to delete first"
 
 #: src/controller/callbacks_basic.c
 msgid "This path already exists and will not be added again."
-msgstr "This path already exists and will not be added again."
+msgstr "This path already exists and will not be added again."
+
+#: src/ui/main_window.c
+msgid "Dark Mode"
+msgstr "Dark Mode"
+
+#: src/ui/main_window.c
+msgid "Light Mode"
+msgstr "Light Mode"

po/messages.pot

@@ -124,3 +124,11 @@ msgstr ""
 #: src/controller/callbacks_nav.c
 msgid "Redo completed"
 msgstr ""
+
+#: src/ui/main_window.c
+msgid "Dark Mode"
+msgstr ""
+
+#: src/ui/main_window.c
+msgid "Light Mode"
+msgstr ""

po/zh_CN.po

@@ -406,4 +406,12 @@ msgstr "请先选择要删除的项"
 
 #: src/controller/callbacks_basic.c
 msgid "This path already exists and will not be added again."
-msgstr "该路径已存在，不会重复添加。"
+msgstr "该路径已存在，不会重复添加。"
+
+#: src/ui/main_window.c
+msgid "Dark Mode"
+msgstr "深色模式"
+
+#: src/ui/main_window.c
+msgid "Light Mode"
+msgstr "浅色模式"