display.py 342 -> 248, under the 250-line cap. The page-count estimate,
the dropped-page warning and the consumables reference move verbatim to
_page_count.py, which imports the two collaborators the tests patch
(check_page_delivery, estimate_consumable_life) directly.
test_display_part3.py patched only those two names, so it becomes
test_page_count.py with its MOD pointing at the new module. Pass count is
402 before and after.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011w2Pj4Ek3ZNMQVYcFHgXDY