Log Width Truncation

Fixed width truncation of colored and multi-byte log content

The width option in a custom log format sizes a column to a fixed number of visible characters. When the content held color codes or multi-byte characters and was longer than the column, truncation cut the raw bytes: it could slice through the middle of a color code, leaving color bleeding into the rest of the line, or split a multi-byte character into invalid output, and it dropped more visible text than the configured width.

width now measures and cuts by visible characters. Color codes are preserved intact, multi-byte characters are never split, and the column keeps exactly the requested number of visible characters.