Add word wrapping mode (#3597)

* feat: add word wrapping mode for --wrap flag

* Run `cargo fmt` and add CHANGELOG entry

* Add word wrap tests, update manpage and shell completions

- Add integration tests for word wrapping: basic word boundary breaking,
  fallback to character wrapping for long words, line numbers, and
  short lines that fit without wrapping
- Update manpage to document the new 'word' wrapping mode
- Update bash, fish, zsh, and PowerShell completions with 'word' option
- Avoid unnecessary clone of `line_buf` when word wrap is disabled

* make clippy and cargo fmt happy

---------

Co-authored-by: Keith Hall <keith-hall@users.noreply.github.com>

assets/manual/bat.1.in

@@ -102,8 +102,10 @@ Set the tab width to T spaces. Use a width of 0 to pass tabs through directly
 .HP
 \fB\-\-wrap\fR <mode>
 .IP
-Specify the text\-wrapping mode (*auto*, never, character). The '\-\-terminal\-width' option
-can be used in addition to control the output width.
+Specify the text\-wrapping mode (*auto*, never, character, word). The '\-\-terminal\-width' option
+can be used in addition to control the output width. In \fBword\fR mode, lines are broken at
+whitespace boundaries. If a single word exceeds the terminal width, it falls back to
+character wrapping.
 .HP
 \fB\-S\fR, \fB\-\-chop\-long\-lines\fR
 .IP