Refactor input handling and validation with new tests#2

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hthienloc wants to merge 2 commits intoLotusInputMethod:masterfrom

hthienloc:master

Commits on Mar 21, 2026

feat: Refactor backspace and UI shortcut logic, add input validation, update module path, and include new tests.
hthienloc
committed
refactor: simplify backspace handling logic and update related test expectations.
hthienloc
committed