fix: append ANSI reset after trimming to prevent terminal color bleed

[YoshKoz]

Fixes #778

Root Cause

ansi_trim_end() detects trailing whitespace in colored output by stripping ANSI codes, measuring the trimmed visual width, then calling truncate(s, trimmed_width) to remove the trailing spaces from the ANSI-wrapped string.

truncate() stops at the first character that would exceed trimmed_width and returns everything up to that point — discarding any ANSI escape sequences that appeared after it, including the \x1b[0m reset code at the end of the last styled column.

Result: when the last visible column has trailing padding (content shorter than column width), the reset code is dropped, leaving the terminal in a styled state (bold/white) after procs exits.

Fix

After truncation, append an explicit \x1b[0m reset when the input contained ANSI codes (detected by comparing stripped != s). This ensures every trimmed line ends in a clean terminal state without affecting plain-text output paths.

Before: \x1b[38;5;15mCommand\n         (color/bold left open)
After:  \x1b[38;5;15mCommand\x1b[0m\n  (properly reset)

Verified by piping procs --color=always through cat -A: each row now ends with \x1b[0m before the newline.