fix: add font-family inherit to load more tracks button (#622)

Buttons don't inherit font from parent by default in CSS.

Co-authored-by: Claude <[e-mail]>

frontend/src/routes/u/[handle]/+page.svelte

···
 		border: 1px solid var(--border-subtle);
 		border-radius: 8px;
 		color: var(--text-secondary);
+		font-family: inherit;
 		font-size: 0.95rem;
 		cursor: pointer;
 		transition: all 0.2s ease;