CUB-122: Scaffold Control Center React frontend

frontend-legacy/src/app/layout/bottom-nav/bottom-nav.component.scss

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+// ============================================================================
+// Bottom Navigation Bar — Mobile Navigation
+// Per CUB-27 spec breakpoints:
+//   Compact (0–599px): Visible — M3 NavigationBar pattern
+//   Medium+ (≥600px): Hidden — nav rail takes over
+// ============================================================================
+
+.bottom-nav {
+  display: none; // Hidden on desktop, shown on mobile via media query
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  height: var(--cc-bottom-nav-height);
+  background-color: var(--cc-surface-container-high);
+  border-top: 1px solid var(--cc-outline);
+  z-index: 50;
+  align-items: center;
+  justify-content: space-around;
+  padding: 0 8px;
+  // Safe area inset for notched devices
+  padding-bottom: env(safe-area-inset-bottom, 0px);
+}
+
+.bottom-nav__item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 4px;
+  min-width: 48px;
+  min-height: 48px;
+  padding: 8px 0;
+  text-decoration: none;
+  color: var(--cc-on-surface-variant);
+  border-radius: 16px;
+  transition: color 150ms ease, background-color 150ms ease;
+
+  &:hover {
+    color: var(--cc-on-surface);
+    background-color: rgba(255, 255, 255, 0.06);
+  }
+
+  &--active {
+    color: var(--status-active);
+    background-color: var(--status-active-bg);
+
+    .bottom-nav__label {
+      font-weight: 500;
+    }
+  }
+}
+
+.bottom-nav__icon-wrapper {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 32px;
+  height: 32px;
+  border-radius: 16px;
+
+  .bottom-nav__item--active & {
+    background-color: var(--status-active-bg);
+  }
+}
+
+.bottom-nav__label {
+  font-size: 12px;
+  font-weight: 400;
+  letter-spacing: 0.02em;
+  white-space: nowrap;
+}
+
+// ---------------------------------------------------------------------------
+// Compact (0–599px): Show bottom nav
+// ---------------------------------------------------------------------------
+@media (max-width: 599px) {
+  .bottom-nav {
+    display: flex;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Medium+ (≥600px): Hidden — nav rail takes over
+// ---------------------------------------------------------------------------
+
+// ---------------------------------------------------------------------------
+// Accessibility: Reduced Motion
+// ---------------------------------------------------------------------------
+@media (prefers-reduced-motion: reduce) {
+  .bottom-nav__item {
+    transition: none;
+  }
+}