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/IconButton.js.txt

@@ -0,0 +1,51 @@
+import React from 'react';
+import { Icon } from './Icon';
+
+const CSS = `
+.ct-iconbtn {
+  display: inline-flex; align-items: center; justify-content: center;
+  border-radius: var(--radius-2);
+  border: 1px solid transparent;
+  background: transparent;
+  color: var(--ink-2);
+  cursor: pointer;
+  transition: background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
+}
+.ct-iconbtn:hover:not(:disabled) { background: var(--paper-2); color: var(--ink-1); }
+.ct-iconbtn:active:not(:disabled) { background: var(--paper-3); }
+.ct-iconbtn:disabled { opacity: 0.45; cursor: not-allowed; }
+.ct-iconbtn--md { width: 34px; height: 34px; }
+.ct-iconbtn--sm { width: 28px; height: 28px; }
+.ct-iconbtn--outline { border-color: var(--line-2); background: var(--surface-card); }
+.ct-iconbtn--outline:hover:not(:disabled) { background: var(--paper-2); }
+`;
+(function inject() {
+  if (typeof document !== 'undefined' && !document.getElementById('ct-iconbtn-css')) {
+    const s = document.createElement('style'); s.id = 'ct-iconbtn-css'; s.textContent = CSS;
+    document.head.appendChild(s);
+  }
+})();
+
+export function IconButton({
+  icon,
+  label,
+  variant = 'ghost',
+  size = 'md',
+  disabled = false,
+  style,
+  ...rest
+}) {
+  return (
+    <button
+      type="button"
+      className={`ct-iconbtn ct-iconbtn--${size}${variant === 'outline' ? ' ct-iconbtn--outline' : ''}`}
+      aria-label={label}
+      title={label}
+      disabled={disabled}
+      style={style}
+      {...rest}
+    >
+      <Icon name={icon} size={size === 'sm' ? 15 : 17} />
+    </button>
+  );
+}