Add editor handlers.rs tests (15 tests, was 0)
editor/handlers.rs now has comprehensive key dispatch tests:
- Mode checks (default is Insert)
- Esc/F10 behavior (save-before-close prompt on dirty buffer)
- F2 save, F9 menubar toggle, Ctrl-Q literal insert toggle
- Backspace, Enter, Tab, printable char insertion
- Bookmark toggle, Ctrl-S syntax toggle
- Ctrl-H backspace alias (MC parity)
- Prompt mode Esc cancel
- Insert literal mode pass-through
Also: made viewer mod tests pub(crate) for cross-module test access.
1455 tests passing, zero warnings.
vasilito
7ee4a1cfb6