v1.4.0 — word goals, reliability, bulletproof tests

v1.4.0 — word goals, reliability hardening, bulletproof tests

New

• 🎯 Per-chapter word goal — set a target per chapter (default = format size); chart bars and stats show words / goal
• 🔍 Chapter search — filter the chapter list instantly

Reliability ("never broke")

• Resilience-hardened $: a missing element becomes a safe no-op — nothing can crash the app
• Global error handler with a friendly notice; autosave + quota fallback; guarded empty-state actions
• Bulletproof test suite — tests/bullet.js: 59 checks · 5 angles (syntax, structure, functional, robustness, regression), all passing

Docs: README + Guide updated (word goals, search, reliability, how to run tests).