feat(frontend): add shimmer, scan, row-flash keyframes

tailwind.config.js

@@ -104,12 +104,28 @@ export default {
           from: { opacity: "0" },
           to: { opacity: "1" },
         },
+        shimmer: {
+          "0%": { transform: "translateX(-100%)" },
+          "100%": { transform: "translateX(100%)" },
+        },
+        scan: {
+          "0%": { transform: "translateX(-100%)" },
+          "50%": { transform: "translateX(300%)" },
+          "100%": { transform: "translateX(-100%)" },
+        },
+        "row-flash": {
+          "0%": { backgroundColor: "hsl(var(--accent) / 0.10)" },
+          "100%": { backgroundColor: "transparent" },
+        },
       },
       animation: {
         "accordion-down": "accordion-down 0.2s ease-out",
         "accordion-up": "accordion-up 0.2s ease-out",
         "fade-in": "fade-in 0.4s cubic-bezier(0.2, 0.8, 0.2, 1) both",
         "fade-in-soft": "fade-in-soft 0.6s ease-out both",
+        shimmer: "shimmer 2.4s linear infinite",
+        scan: "scan 1.6s ease-in-out infinite",
+        "row-flash": "row-flash 1.2s ease-out",
       },
     },
   },