Revert "Fix: PDF依赖缺失提示框右侧边框未对齐"

This reverts commit 745f5970.

@@ -5,7 +5,6 @@
 import os
 import sys
 import platform
-import unicodedata
 from pathlib import Path
 from loguru import logger
 from ctypes import util as ctypes_util
@@ -13,48 +12,9 @@ from ctypes import util as ctypes_util
 BOX_CONTENT_WIDTH = 62
 
 
-def _display_width(text: str) -> int:
-    """计算字符串在终端中的显示宽度（中文/emoji 等宽字符占 2 列）。"""
-    width = 0
-    chars = list(text)
-    n = len(chars)
-    i = 0
-    while i < n:
-        ch = chars[i]
-        cp = ord(ch)
-
-        # 零宽：组合标记 / 格式字符（含 Zero Width Joiner 等）
-        if unicodedata.category(ch) in ('Mn', 'Me', 'Cf'):
-            i += 1
-            continue
-
-        # East Asian Fullwidth / Wide（中文汉字、全角标点等）
-        if unicodedata.east_asian_width(ch) in ('F', 'W'):
-            width += 2
-            i += 1
-            continue
-
-        # 补充平面 emoji（U+1F000 及以上，如 📄🍎📖🐧🪟）
-        if cp >= 0x1F000:
-            width += 2
-            i += 1
-            continue
-
-        # 文本符号 + VS16 (U+FE0F) → emoji 呈现，宽 2 列（如 ⚠️）
-        if i + 1 < n and ord(chars[i + 1]) == 0xFE0F:
-            width += 2
-            i += 2  # 跳过当前字符和 VS16
-            continue
-
-        width += 1
-        i += 1
-    return width
-
-
 def _box_line(text: str = "") -> str:
     """Render a single line inside the 66-char help box."""
-    padding = max(0, BOX_CONTENT_WIDTH - _display_width(text))
-    return f"║  {text}{' ' * padding}║\n"
+    return f"║  {text:<{BOX_CONTENT_WIDTH}}║\n"
 
 
 def _get_platform_specific_instructions():