Add Angular Material

Integrated @angular/material and @angular/cdk into the project and created a custom theme using SCSS. Updated angular.json to include the new theme, added Roboto and Material Icons fonts in index.html, and improved global styles for Material compatibility.

src/styles.css

@@ -1,2 +1,5 @@
 /* You can add global styles to this file, and also import other style files */
-@import "tailwindcss"
+@import "tailwindcss";
+
+html, body { height: 100%; }
+body { margin: 0; font-family: Roboto, "Helvetica Neue", sans-serif; }