Make design system theme-aware: fix hardcoded colors, font tokens, hex opacity master
- Convert input/modal primitives from static StyleSheet.create with hardcoded hex colors to dynamic theme-aware inline styles using useTheme() — fixes dark mode rendering for inputs, labels, errors, modal borders - Replace all fontFamily: 'monospace' with fontFamilies.monoRegular token across 4 app files (timer, countdown, key-manager, settings-list-item) - Replace all hex opacity concatenation (color + '22') with hexToRgba() utility across 6 files (menu, admonition, content-warning-badge, emoji-picker, recommendations-manager, badge-issuer-panel) - Export hexToRgba from @streamplace/components barrel - Fix hardcoded placeholderTextColor in login-form and advanced-category-settings to use theme.colors.textMuted