`mouse/button.dart` and `mouse/button_state.dart` were imported but
nothing in terminal_view referenced their symbols — analyzer
warnings, not infos. Removed.
Probable origin: a half-landed mouse-forwarding refactor (the actual
work is now scoped under T-74); the imports can come back when the
real wiring lands. Removing them in the meantime keeps the analyze
gate clean.
Co-Authored-By: Claude <noreply@anthropic.com>
jpmschweitzerandClaude
bfa128f131