[PATCH 0/2] Fix misaligned output of git repo structure

While localizing Git 2.52.0, I noticed that the output table from git repo structure becomes misaligned when displaying UTF-8 characters. For example:

    | 仓库结构   | 值  |
    | -------------- | ---- |
    | * 引用       |      |
    |   * 计数     |   67 |
    |     * 分支   |    6 |
    |     * 标签   |   30 |
    |     * 远程   |   19 |
    |     * 其它   |   12 |
    |                |      |
    | * 可达对象 |      |
    |   * 计数     | 2217 |
    |     * 提交   |  279 |
    |     * 树      |  740 |
    |     * 数据对象 | 1168 |
    |     * 标签   |   30 |

The previous implementation used simple width formatting with printf() which didn't properly handle multi-byte UTF-8 characters, causing misaligned table columns when displaying repository structure information.

This change modifies the stats_table_print_structure function to use strbuf_utf8_align() instead of basic printf width specifiers. This ensures proper column alignment regardless of the character encoding of the content being displayed.

BTW, I used two AI coding tools (Claude Code and Gemini-CLI) to generate the commits, and added the "Co-developed-by" trailers in the commit messages by using one of my opensource project:

 - https://github.com/ai-coding-workshop/commit-msg

## Changes

Jiang Xin (2):
  t/unit-tests: add UTF-8 width tests for CJK chars
  builtin/repo: fix table alignment for UTF-8 characters

 Makefile                    |  1 +
 builtin/repo.c              | 22 ++++++++--
 t/meson.build               |  1 +
 t/unit-tests/u-utf8-width.c | 85 +++++++++++++++++++++++++++++++++++++
 4 files changed, 105 insertions(+), 4 deletions(-)
 create mode 100644 t/unit-tests/u-utf8-width.c