Recreates base.html and main.html templates (lost during reset).
Adds game.html with setup UI (category picker, board size slider),
interactive grid table, word list sidebar, text input, click-to-select,
timer, and completion banner. Adds game.js for all frontend logic.
Extends theme.css with game grid and form control styles using the
indigo/coral palette.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
