refactor: remove Tailwind utility classes from globals.css

Co-authored-by: aider (openrouter/anthropic/claude-sonnet-4.5) <aider@aider.chat>

src/app/globals.css

@@ -60,68 +60,3 @@ select {
   outline: 2px solid var(--mat-sys-primary);
   outline-offset: 2px;
 }
-
-/* M3 utility classes */
-.flex {
-  display: flex;
-}
-
-.flex-col {
-  flex-direction: column;
-}
-
-.items-center {
-  align-items: center;
-}
-
-.justify-between {
-  justify-content: space-between;
-}
-
-.gap-2 {
-  gap: 0.5rem;
-}
-
-.gap-4 {
-  gap: 1rem;
-}
-
-.p-4 {
-  padding: 1rem;
-}
-
-.p-6 {
-  padding: 1.5rem;
-}
-
-.mb-2 {
-  margin-bottom: 0.5rem;
-}
-
-.mb-4 {
-  margin-bottom: 1rem;
-}
-
-.space-y-4 > * + * {
-  margin-top: 1rem;
-}
-
-.space-y-6 > * + * {
-  margin-top: 1.5rem;
-}
-
-.text-sm {
-  font-size: 0.875rem;
-}
-
-.font-medium {
-  font-weight: 500;
-}
-
-.font-semibold {
-  font-weight: 600;
-}
-
-.text-muted-foreground {
-  color: var(--mat-sys-on-surface-variant);
-}