feat: add landing page copy and styles for English and Amharic versions

- Introduced `landing-copy.ts` containing text for the public landing page, supporting both English and Amharic languages.
- Added `landing.css` for styling the landing page, ensuring scoped styles to prevent conflicts with other app styles.
- Implemented smooth scrolling and animations for a better user experience.

libs/ui/src/lib/landing/landing.css

@@ -0,0 +1,56 @@
+/* Public landing page — scoped under .ema-landing so nothing leaks into the
+   rest of either app. Neither app's global CSS (portal's .ema-page-enter /
+   .ema-hover-lift, portal's --ema-surface-*) is available here, so this file
+   is self-contained. */
+
+.ema-landing {
+  scroll-behavior: smooth;
+}
+
+.ema-landing section[id] {
+  /* Offsets anchor jumps by the sticky header height so the heading isn't
+     hidden underneath it. Keep in sync with the header's fixed height. */
+  scroll-margin-top: 72px;
+}
+
+.ema-landing .ema-landing-fade {
+  animation: ema-landing-fade-up 360ms cubic-bezier(0.22, 1, 0.36, 1) both;
+}
+
+@keyframes ema-landing-fade-up {
+  from {
+    opacity: 0;
+    transform: translateY(10px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+.ema-landing .ema-landing-hover {
+  transition:
+    transform 160ms ease,
+    box-shadow 160ms ease,
+    border-color 160ms ease;
+}
+.ema-landing .ema-landing-hover:hover {
+  transform: translateY(-3px);
+}
+
+/* Amharic runs 20-40% longer than English and falls back to a different font
+   (Inter has no Ethiopic glyphs), so it needs more vertical room. */
+.ema-landing:lang(am) {
+  line-height: 1.7;
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .ema-landing {
+    scroll-behavior: auto;
+  }
+  .ema-landing .ema-landing-fade,
+  .ema-landing .ema-landing-hover {
+    animation: none;
+    transition: none;
+  }
+}