## Changes
1. **Fix keyboard event semantics** (per review feedback)
- Only dispatch keydown/keyup for single-character input
- Avoids inconsistent event payloads for multi-character strings
- Prevents confusion in editors that correlate key events with text changes
2. **Remove extra blank line**
- Formatting consistency
Reviewer noted that dispatching key events with only the last character
of multi-character text creates semantic inconsistency with the actual
DOM mutation (which inserts the full string at once).
This fix follows the suggested change from the review.
Remove [SCROLL DEBUG] console.log statements that were left over
from development in scrollVertically and scrollHorizontally
functions. These debug statements should not be in production code.
