Scaffold CommiTea: yarn workspaces, Electron shell, core label schema, design system

- apps/desktop: electron-vite + React + Tailwind mapped onto design tokens
  (preflight off; tokens/base.css owns the reset); boots to a Reginald
  placeholder proving fonts/tokens/core wiring
- packages/core: pure TS; gitea label schema (est/*, p/*, deadline/hard)
  with pessimistic conflict resolution + 15 unit tests
- docs/design: full design handoff (tokens, 16 component contracts,
  interactive 14-screen prototype, Reginald voice rules)
- docs/PLAN.md: product plan (purity rule, pm-state repo, deterministic
  scheduler + Monte Carlo, directive log)
- Deliberate deviation from novelpad stack: no ElectricSQL/PGlite — local
  store is a rebuildable cache over gitea REST/webhooks (better-sqlite3
  in main process, arriving in P1)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/design/components/core/Button.js.txt

@@ -0,0 +1,63 @@
+import React from 'react';
+
+const CSS = `
+.ct-btn {
+  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
+  font: 600 14px/1 var(--font-sans);
+  border-radius: var(--radius-2);
+  border: 1px solid transparent;
+  cursor: pointer;
+  white-space: nowrap;
+  transition: background var(--duration-fast) var(--ease-out),
+              border-color var(--duration-fast) var(--ease-out),
+              color var(--duration-fast) var(--ease-out);
+}
+.ct-btn:disabled { opacity: 0.45; cursor: not-allowed; }
+.ct-btn--md { height: 34px; padding: 0 14px; }
+.ct-btn--sm { height: 28px; padding: 0 10px; font-size: 13px; }
+.ct-btn--primary { background: var(--accent); color: var(--text-on-accent); }
+.ct-btn--primary:hover:not(:disabled) { background: var(--accent-hover); }
+.ct-btn--primary:active:not(:disabled) { background: var(--accent-pressed); }
+.ct-btn--secondary { background: var(--surface-card); border-color: var(--line-2); color: var(--ink-1); }
+.ct-btn--secondary:hover:not(:disabled) { background: var(--paper-2); }
+.ct-btn--secondary:active:not(:disabled) { background: var(--paper-3); }
+.ct-btn--ghost { background: transparent; color: var(--ink-2); }
+.ct-btn--ghost:hover:not(:disabled) { background: var(--paper-2); color: var(--ink-1); }
+.ct-btn--ghost:active:not(:disabled) { background: var(--paper-3); }
+.ct-btn--danger { background: var(--danger); color: var(--ink-inverse); }
+.ct-btn--danger:hover:not(:disabled) { filter: brightness(0.92); }
+`;
+(function inject() {
+  if (typeof document !== 'undefined' && !document.getElementById('ct-button-css')) {
+    const s = document.createElement('style'); s.id = 'ct-button-css'; s.textContent = CSS;
+    document.head.appendChild(s);
+  }
+})();
+
+import { Icon } from './Icon';
+
+export function Button({
+  variant = 'primary',
+  size = 'md',
+  icon,
+  iconRight,
+  disabled = false,
+  children,
+  style,
+  ...rest
+}) {
+  const iconSize = size === 'sm' ? 15 : 17;
+  return (
+    <button
+      type="button"
+      className={`ct-btn ct-btn--${size} ct-btn--${variant}`}
+      disabled={disabled}
+      style={style}
+      {...rest}
+    >
+      {icon ? <Icon name={icon} size={iconSize} /> : null}
+      {children}
+      {iconRight ? <Icon name={iconRight} size={iconSize} /> : null}
+    </button>
+  );
+}