feat: add @sda/flair-elements-ui library

Angular 19+ standalone library with 61 components, 15 directives,
and 8 services for decorative visual effects, animations, and
micro-interactions.

Components include particle systems, flow fields, aurora effects,
tilt/holographic/spotlight cards, text effects, dividers, scroll
animations, generative art, celebrations, image treatments,
morphing shapes, terminal output, and pattern textures.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/fl-checkmark-flourish/fl-checkmark-flourish.component.scss

@@ -0,0 +1,36 @@
+:host {
+  display: inline-block;
+  position: relative;
+}
+
+.fl-checkmark-flourish__svg {
+  display: block;
+}
+
+.fl-checkmark-flourish__circle,
+.fl-checkmark-flourish__checkmark {
+  transition: stroke-dashoffset 0.3s ease-in-out;
+}
+
+.fl-checkmark-flourish__sparkle {
+  position: absolute;
+  font-size: 1rem;
+  transform: translate(-50%, -50%);
+  pointer-events: none;
+  animation: fl-checkmark-sparkle 1s ease-out forwards;
+}
+
+@keyframes fl-checkmark-sparkle {
+  0% {
+    opacity: 0;
+    transform: translate(-50%, -50%) scale(0);
+  }
+  50% {
+    opacity: 1;
+    transform: translate(-50%, -50%) scale(1.2);
+  }
+  100% {
+    opacity: 0;
+    transform: translate(-50%, -50%) scale(0.8);
+  }
+}