🚂 Word Train — Playable POC

Build long phrase chains. Enter the next word part that commonly follows the current word.

Rule: current → next must be in the phrase-transition graph (not limited to strict compounds).

Examples: train→yard→work, hard→boiled→egg→salad→dressing→room. Build streaks to level up routes and earn bonus fuel/points.

POC surfaces only — no real payments wired yet.