fix(deps): migrate tailwindcss to v4

input.css

@@ -0,0 +1,34 @@
+@import 'tailwindcss';
+
+@source './static/**/*.js';
+
+@theme {
+  --animate-fade: fadeOut 0.25s ease-in;
+
+  @keyframes fadeOut {
+    0% {
+      opacity: 1;
+    }
+    100% {
+      opacity: 0;
+    }
+  }
+}
+
+/*
+  The default border color has changed to `currentColor` in Tailwind CSS v4,
+  so we've added these compatibility styles to make sure everything still
+  looks the same as it did with Tailwind CSS v3.
+
+  If we ever want to remove these styles, we need to add an explicit border
+  color utility to any element that depends on these defaults.
+*/
+@layer base {
+  *,
+  ::after,
+  ::before,
+  ::backdrop,
+  ::file-selector-button {
+    border-color: var(--color-gray-200, currentColor);
+  }
+}