[Icon request] fcitx-mozc

### Specifications
- Hardcode-Tray version : `4.3`
- Distribution : `ArcoLinuxD`
- Gtk version : `3.24.21`
- Python-cairosvg version: `2.4.2`
- Cairo version : `1.17.2`
- Sni-qt-patched-git version: `r.-1`
- Application name : `fcitx-mozc`
- Application version : `2.23.2815.102`
There are also icons like *fcitx-kbd.svg* (this one is a keyboard icon) that I couldn't find if was related to *fcitx* itself or *mozc*. Anyway fcitx version: `4.2.9.7`

Start by inspecting Hardcode-Tray’s existing tray-icon handling and icon assets, using the mentioned fcitx-kbd.svg as a reference. Determine how fcitx-mozc should be represented, then verify that the application’s tray icon is handled correctly in the stated environment and that existing icon behavior remains intact.

Written by the indexing model from the issue text.