Replace the hardcoded 12-emoji grid in the repo icon settings with the full searchable, category-navigable emoji picker, reusing the existing emoji-picker-react dependency in a lazily-loaded chunk.
Every pick is re-validated through sanitizeRepoIcon, so an over-cap ZWJ/skin-tone sequence surfaces a toast instead of silently no-op'ing. Skin tones stay selectable.
Maintainer follow-up: use lazyWithRetry so a failed chunk cannot permanently blank the Settings page, disable autoFocusSearch on this inline picker, scope font-family to descendants (the library sets sans-serif on every child), cover the uncovered dark-mode picker variables, match the app scrollbar, and assert the result in the DOM per tests/e2e/AGENTS.md.
New strings are translated in es/ja/ko/zh.
Co-authored-by: chucoding <chucoding@users.noreply.github.com>
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