fix: avoid utf8 panic in string preview truncation#890
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Replace direct byte slicing in remote SSH, relay websocket, and CLI session preview paths with UTF-8-safe truncation helpers to prevent panic when handling Chinese or other multibyte text. Also add a relay-server test covering multibyte truncation boundaries.
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Replace direct byte slicing in remote SSH, relay websocket, and CLI
session preview paths with UTF-8-safe truncation helpers to prevent
panic when handling Chinese or other multibyte text.
Also add a relay-server test covering multibyte truncation boundaries.