initial project scaffold

Rust workspace with nomina-core (rename engine) and nomina-app (Tauri v2 shell).
React/TypeScript frontend with tabbed rule panels, virtual-scrolled file list,
and Zustand state management. All 9 rule types implemented with 25 passing tests.

ui/src/index.css

@@ -0,0 +1,78 @@
+@import "tailwindcss";
+
+:root {
+  --bg-primary: #ffffff;
+  --bg-secondary: #f8f9fa;
+  --bg-tertiary: #e9ecef;
+  --text-primary: #212529;
+  --text-secondary: #6c757d;
+  --border: #dee2e6;
+  --accent: #4f46e5;
+  --accent-hover: #4338ca;
+  --success: #16a34a;
+  --warning: #d97706;
+  --error: #dc2626;
+  --row-even: #ffffff;
+  --row-odd: #f8f9fb;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --bg-primary: #1a1a2e;
+    --bg-secondary: #16213e;
+    --bg-tertiary: #0f3460;
+    --text-primary: #e2e8f0;
+    --text-secondary: #94a3b8;
+    --border: #334155;
+    --accent: #6366f1;
+    --accent-hover: #818cf8;
+    --success: #22c55e;
+    --warning: #f59e0b;
+    --error: #ef4444;
+    --row-even: #1a1a2e;
+    --row-odd: #1e2240;
+  }
+}
+
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
+  background: var(--bg-primary);
+  color: var(--text-primary);
+  overflow: hidden;
+  height: 100vh;
+}
+
+#root {
+  height: 100vh;
+  display: flex;
+  flex-direction: column;
+}
+
+input, select, button {
+  font-family: inherit;
+  font-size: inherit;
+}
+
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+::-webkit-scrollbar-track {
+  background: var(--bg-secondary);
+}
+
+::-webkit-scrollbar-thumb {
+  background: var(--border);
+  border-radius: 4px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: var(--text-secondary);
+}