Word Navigation Using ICU Word Boundaries

What: Text input word navigation (w, b, e in vim mode) now uses proper Unicode word boundary detection. Evidence: Class O3 at line 171232 - getWordBoundaries() method Details:

• Replaced character-by-character word detection with Intl.Segmenter-based word boundaries
• Provides more accurate word movement for international text and code
• Affects nextWord(), prevWord(), and endOfWord() cursor movements