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* fix(share): slice content label by utf-8 runes * Apply suggestions about avoiding allocations Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> * lint: remove unused import * test: add test cases for CJK truncation * test: add tests for ASCII labels too --------- Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>