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fix: handle character boundaries for wide chars in extend_selection fix #17420. When calling 'extend_selection' within a string, r-a attempts to locate the current word at the cursor. This is done by finding the first char before the cursor which is not a letter, digit, or underscore. The position of this character is referred to as `start_idx`, and the word is considered to start from `start_idx + 1`. However, for wide characters, `start_idx + 1` is not character boundaries, which leading to panic. We should use `ceil_char_boundary` to ensure that the idx is always on character boundaries.