dsh-icon-theme: Customizable icons for DSH Settings and Sidebar

dsh-icon-theme is a DSH plugin released by yzke under the MIT license, designed for the DSH 0.1.x environment. The plugin aims to address the user experience issue where settings and sidebar icons unconditionally fall back to gear icons due to a lack of a public resolver. Its core functions include automatically discovering live contributions for `settings.section` and `sidebar.footer.action`, allowing users to customize or restore icons via stable keys (e.g., `settings.section:market`), thereby avoiding reliance on translation tags or DOM positions. The plugin includes 121 built-in offline glyphs (covering Fluent UI and DSH official UI) and does not require a network connection to run.