New config setting nav_keys (now ["pagenum"]) picks which nav keys are
coloured; nav_keys.py restores the built-in key for any kind not listed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
nav_templates.json holds Companion's own UP / page number / DOWN keys after
'convert to regular button'; make_page.py colours them from the ALL tile and
nav_keys.py copies them onto all 96 other pages (288 keys, recorded in
nav_locations.json; --revert restores the built-in keys). Also rewrites the
README's top half, which an earlier edit had duplicated.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>