[0633] 修复在 Bbb (\mathbb) 字体下输入数字变成奇怪符号的问题#3598
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根据 task 0633 修复在 Bbb 字体下输入数字变为乱码符号的问题。本 PR 修改了
fonts-ec.scm中Bbb的文本模式字体映射（由tex msbm改为math-capital msbm），使其在遇到非大写字母/数字时可以完美安全地降级到常规 fallback 字体上，实现与\mathbf后输入数字一致的普通粗体/罗马数字效果（避免直接渲染msbm对应的 ASCII 49 处的乱码符号）。本 PR 100% 保持了 C++ 和 Scheme 键盘映射latex-kbd.scm的原生纯净状态，避免了 LaTeX 导出与宏未定义的任何副作用，且无需任何 C++ 编译时间。