* M2: styles.apply (Apply Styles) command; parity 355/405
Add Home > Styles > Apply Styles as a pure command. With a style name
or id it runs para.style (one undo step); with no params it opens the
styles pane and returns {"pane": true}. Non-string, empty or
whitespace style values return CmdError::Params. Move Mod+Shift+S
from para.style to styles.apply. Add 8 tests, ja/zh labels, and
regenerate docs/parity.md.
* i18n: pt-BR label for Apply Styles
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
