initial commit

frontend/src/app/layout/bottom-nav/bottom-nav.component.html

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+<nav class="bottom-nav" aria-label="Bottom navigation">
+  @for (dest of destinations; track dest.route) {
+    <a
+      class="bottom-nav__item"
+      [routerLink]="dest.route"
+      routerLinkActive="bottom-nav__item--active"
+      #rla="routerLinkActive"
+      [attr.aria-label]="dest.label"
+      [attr.aria-current]="rla.isActive ? 'page' : null"
+    >
+      <span class="bottom-nav__icon-wrapper">
+        <mat-icon
+          [matBadge]="dest.badge ?? 0"
+          [matBadgeHidden]="!dest.badge"
+          matBadgePosition="above after"
+          matBadgeSize="small"
+        >
+          {{ dest.icon }}
+        </mat-icon>
+      </span>
+      <span class="bottom-nav__label">{{ dest.label }}</span>
+    </a>
+  }
+</nav>

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

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+// ============================================================================
+// Bottom Navigation Bar — Mobile Navigation
+// Per spec Section 3.2: M3 NavigationBar pattern
+// Visible only on compact breakpoint (< 600px)
+// ============================================================================
+
+.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;
+}
+
+.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;
+}
+
+// Show bottom nav only on compact breakpoint
+@media (max-width: 599px) {
+  .bottom-nav {
+    display: flex;
+  }
+}

frontend/src/app/layout/bottom-nav/bottom-nav.component.ts

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+import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { RouterLink, RouterLinkActive } from '@angular/router';
+import { MatIconModule } from '@angular/material/icon';
+import { MatBadgeModule } from '@angular/material/badge';
+import { NAV_DESTINATIONS } from '../../models/nav.model';
+
+/**
+ * Bottom Navigation Bar for mobile (compact breakpoint).
+ * Per spec Section 3.2: M3 NavigationBar, 3–5 destinations,
+ * active destination uses M3 indicator pill.
+ * Visible only on compact (< 600px) breakpoint.
+ */
+@Component({
+  selector: 'app-bottom-nav',
+  standalone: true,
+  imports: [RouterLink, RouterLinkActive, MatIconModule, MatBadgeModule],
+  templateUrl: './bottom-nav.component.html',
+  styleUrl: './bottom-nav.component.scss',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class BottomNavComponent {
+  /** Show only first 5 destinations on bottom nav */
+  protected readonly destinations = NAV_DESTINATIONS.slice(0, 5);
+}