feat: preset stili contenuto con whitelist

src/lib/style-presets.ts

@@ -0,0 +1,31 @@
+export const STYLE_GROUPS = {
+  size: ['s', 'm', 'l'],
+  color: ['accent', 'accent-dark', 'dark', 'heading', 'text', 'text-light', 'white'],
+  weight: ['normal', 'bold'],
+  style: ['normal', 'italic'],
+  align: ['left', 'center', 'right'],
+} as const;
+
+export type StyleGroup = keyof typeof STYLE_GROUPS;
+
+export function validateStyles(input: unknown):
+  | { ok: true; styles: Record<string, string> }
+  | { ok: false; error: string } {
+  if (typeof input !== 'object' || input === null || Array.isArray(input)) {
+    return { ok: false, error: 'Stili non validi.' };
+  }
+  const out: Record<string, string> = {};
+  for (const [k, v] of Object.entries(input)) {
+    const allowed = (STYLE_GROUPS as Record<string, readonly string[]>)[k];
+    if (!allowed) return { ok: false, error: `Gruppo stile sconosciuto: ${k}` };
+    if (typeof v !== 'string' || !allowed.includes(v)) {
+      return { ok: false, error: `Valore non ammesso per ${k}: ${String(v)}` };
+    }
+    out[k] = v;
+  }
+  return { ok: true, styles: out };
+}
+
+export function stylesToClasses(styles: Record<string, string>): string {
+  return Object.entries(styles).map(([k, v]) => `cs-${k}-${v}`).join(' ');
+}