feat(dashboard): selector de empresa + flag p_all en _dash_responses

app/dashboard/page.tsx

@@ -14,6 +14,14 @@ import { FilterSidebar }         from '@/components/dashboard/filter-sidebar'
 import type { DashboardFilters } from '@/lib/dashboard-types'
 
 // El survey_id se pasa como query param: /dashboard?survey_id=UUID
+// '00000000-0000-0000-0000-000000000000' = flag p_all (vista agregada de todos los surveys)
+const SURVEY_OPTIONS = [
+  { label: 'Todos', id: '00000000-0000-0000-0000-000000000000' },
+  { label: 'InQuality', id: '30000000-0000-0000-0000-000000000002' },
+  { label: 'Fundación Solidaridad', id: '30000000-0000-0000-0000-000000000003' },
+  { label: 'Demo', id: '30000000-0000-0000-0000-000000000001' },
+]
+
 export default function DashboardPage() {
   const searchParams = useSearchParams()
   const surveyId = searchParams.get('survey_id') ?? '30000000-0000-0000-0000-000000000001'
@@ -40,6 +48,22 @@ export default function DashboardPage() {
             Datos agregados · k-anonimato k≥5 · Encuesta Mapeo de Cuidadores 2026
             {filters.depto && <span className="db-active-filter"> · Filtro: {filters.depto}</span>}
           </p>
+          <nav className="db-survey-nav" aria-label="Selección de empresa">
+            {SURVEY_OPTIONS.map((opt) => (
+              <a
+                key={opt.id}
+                href={`/dashboard?survey_id=${opt.id}`}
+                className={
+                  opt.id === surveyId
+                    ? 'db-survey-link db-survey-link-active'
+                    : 'db-survey-link'
+                }
+                aria-current={opt.id === surveyId ? 'page' : undefined}
+              >
+                {opt.label}
+              </a>
+            ))}
+          </nav>
         </header>
 
         {/* Fila 1: KPIs (span 12) */}

app/globals.css

@@ -559,6 +559,14 @@ body {
 .db-page-title { font-size: 1.375rem; font-weight: 700; color: #fff; margin: 0 0 4px; }
 .db-page-subtitle { font-size: 0.8125rem; color: #9ca3af; margin: 0; }
 .db-active-filter { color: var(--color-re-teal); font-weight: 600; }
+.db-survey-nav { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
+.db-survey-link {
+  font-size: 0.75rem; font-weight: 600; padding: 4px 12px; border-radius: 999px;
+  border: 1px solid rgba(67,187,200,0.3); color: #9ca3af; text-decoration: none;
+  transition: all 0.2s ease;
+}
+.db-survey-link:hover { color: #E7E6E5; border-color: var(--color-re-teal); }
+.db-survey-link-active { background: var(--color-re-teal); color: #0F1923; border-color: var(--color-re-teal); }
 .db-section { margin-bottom: 16px; }
 .db-grid {
   display: grid;

supabase/migrations/20260611000001_dash_responses_all.sql

@@ -0,0 +1,33 @@
+-- Migración: agregar flag p_all a _dash_responses
+-- UUID especial '00000000-0000-0000-0000-000000000000' = todos los surveys
+CREATE OR REPLACE FUNCTION public._dash_responses(
+    p_survey_id uuid,
+    p_depto     text    DEFAULT NULL,
+    p_genero    text[]  DEFAULT NULL,
+    p_etario    text[]  DEFAULT NULL,
+    p_modalidad text[]  DEFAULT NULL
+)
+RETURNS TABLE(response_id uuid)
+LANGUAGE sql STABLE SECURITY DEFINER
+SET search_path = public
+AS $$
+  SELECT r.id
+  FROM public.responses r
+  WHERE (p_survey_id = '00000000-0000-0000-0000-000000000000'
+         OR r.survey_id = p_survey_id)
+    AND (p_depto IS NULL OR r.qi_zone = p_depto)
+    AND (p_genero IS NULL OR cardinality(p_genero) = 0 OR EXISTS (
+        SELECT 1 FROM public.answers a
+        JOIN public.questions q ON q.id = a.question_id
+        WHERE a.response_id = r.id AND q.code = 'A6'
+          AND a.value #>> '{}' = ANY(p_genero)
+    ))
+    AND (p_etario IS NULL OR cardinality(p_etario) = 0
+         OR r.qi_age_bucket = ANY(p_etario))
+    AND (p_modalidad IS NULL OR cardinality(p_modalidad) = 0 OR EXISTS (
+        SELECT 1 FROM public.answers a
+        JOIN public.questions q ON q.id = a.question_id
+        WHERE a.response_id = r.id AND q.code = 'A7'
+          AND a.value #>> '{}' = ANY(p_modalidad)
+    ));
+$$;