Single-letter tool keys (R, O, L, F, S, P, H), Escape, Enter,
Space (and locale equivalents), arrow key names in shortcut tables
and prose. Remove <kbd> from non-key words like 'drag'.
Wrap all keyboard shortcut references in <kbd> tags in user guide,
reference, and development docs across all 7 locales (en, de, es,
fr, it, pl, ru). Tables, inline prose, and parenthetical hints.
