feat: MonoText, KeyboardHint, SectionHeader primitives

src/design-system/primitives/KeyboardHint/KeyboardHint.module.css

@@ -0,0 +1,10 @@
+.kbd {
+  font-family: var(--font-mono);
+  font-size: 10px;
+  background: var(--bg-raised);
+  border: 1px solid var(--border);
+  border-radius: 3px;
+  padding: 0 4px;
+  color: var(--text-secondary);
+  line-height: 1.6;
+}

src/design-system/primitives/KeyboardHint/KeyboardHint.tsx

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+import styles from './KeyboardHint.module.css'
+
+interface KeyboardHintProps {
+  keys: string
+  className?: string
+}
+
+export function KeyboardHint({ keys, className }: KeyboardHintProps) {
+  return <kbd className={`${styles.kbd} ${className ?? ''}`}>{keys}</kbd>
+}

src/design-system/primitives/MonoText/MonoText.module.css

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+.mono { font-family: var(--font-mono); }
+.xs { font-size: 10px; }
+.sm { font-size: 11px; }
+.md { font-size: 13px; }

src/design-system/primitives/MonoText/MonoText.tsx

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+import styles from './MonoText.module.css'
+import type { ReactNode } from 'react'
+
+interface MonoTextProps {
+  children: ReactNode
+  size?: 'xs' | 'sm' | 'md'
+  className?: string
+}
+
+export function MonoText({ children, size = 'md', className }: MonoTextProps) {
+  return <span className={`${styles.mono} ${styles[size]} ${className ?? ''}`}>{children}</span>
+}

src/design-system/primitives/SectionHeader/SectionHeader.module.css

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+.header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+}
+
+.label {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 1.2px;
+  color: var(--text-muted);
+}
+
+.action {
+  font-size: 12px;
+  color: var(--text-muted);
+}

src/design-system/primitives/SectionHeader/SectionHeader.tsx

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+import styles from './SectionHeader.module.css'
+import type { ReactNode } from 'react'
+
+interface SectionHeaderProps {
+  children: ReactNode
+  action?: ReactNode
+  className?: string
+}
+
+export function SectionHeader({ children, action, className }: SectionHeaderProps) {
+  return (
+    <div className={`${styles.header} ${className ?? ''}`}>
+      <span className={styles.label}>{children}</span>
+      {action && <span className={styles.action}>{action}</span>}
+    </div>
+  )
+}