style: unify indigo → purple for AI-related elements in monitoreo-table

Replaces indigo classes with purple in the evaluation button and score
display, consistent with the purple IA theme used in wizard-client and
interactive-demo. Decorative chart colors in rubric-editor kept as-is.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Cespial

src/app/dashboard/entidad/convocatorias/[id]/monitoreo/monitoreo-table.tsx

@@ -221,7 +221,7 @@ export function MonitoreoTable({
                               )
                             }
                             disabled={evaluating !== null}
-                            className="rounded bg-indigo-50 px-1.5 py-0.5 text-[10px] font-medium text-indigo-600 hover:bg-indigo-100 disabled:opacity-50"
+                            className="rounded bg-purple-50 px-1.5 py-0.5 text-[10px] font-medium text-purple-600 hover:bg-purple-100 disabled:opacity-50"
                           >
                             {evaluating ===
                             `${row.submissionId}:${ep.etapaId}`
@@ -238,7 +238,7 @@ export function MonitoreoTable({
                     {Math.round(row.overallProgress)}%
                   </span>
                   {weightedScore !== null && (
-                    <p className="text-[10px] text-indigo-600">
+                    <p className="text-[10px] text-purple-600">
                       {Math.round(weightedScore)}pts
                     </p>
                   )}