Add design tokens and global styles

The single source of truth for colors, fonts, spacing, type scale,
line height, and transition timing — applied as CSS custom properties
on :root per rules/01-code-style.md. Component styles reference these
via var(), never hex literals.

body.crisis-mode swaps --color-bg, --color-text, and --color-accent
to the tighter palette from docs/22-crisis-mode.md. The transition
runs at --transition-ceremonial so the shift is felt rather than
flashed.

Global reset: no-select everywhere (the reading surface is not a
document), .selectable escape hatch for input fields, smooth scroll,
minimal scrollbars hidden on coarse pointers, prefers-reduced-motion
respected. The oncontextmenu handler in app/app.html suppresses
right-click.

Font-face declarations point at static/fonts/ with font-display: swap
and relative URLs so they resolve correctly under the GitHub Pages
base path. Font files land separately.

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