Melissa: hub Configuracoes + Embed + 9 Pages novas + dialog blueprint dark

Sprints 04-29 + 04-30 acumuladas.

- MelissaConfiguracoes: hub 2-col com 6 grupos (Layout/Conta/Agenda/
  Financeiro/WhatsApp/Sistema), tudo embedado via MelissaEmbed.
- MelissaEmbed: wrapper generico que injeta layout-variant=melissa
  e remove cromos pra reaproveitar Pages tradicionais.
- 9 Melissa Pages novas: CadastrosRecebidos, Compromissos, Configuracoes,
  Conversas, Embed, Grupos, Medicos, Recorrencias, Tags.
- Dialog blueprint atualizado: bg-gray-100 (hardcoded light) ->
  bg-[var(--surface-ground)] (tema-aware). 22 dialogs migrados em
  9 arquivos. Anti-pattern documentado.
- PatientsCadastroPage: bug fix dropdown Grupo (optionLabel nome->name),
  toggle vertical/abas com persist localStorage, sticky margin-top.
- Surface picker no popover do MelissaLayout (8 swatches).
- useTopbarPlanMenu, useMelissaWhatsapp, useMelissaPacientesAside novos.
- Migration: status agenda remarcado/confirmado.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/layout/configuracoes/ConfiguracoesWhatsappPage.vue

@@ -1154,9 +1154,9 @@ onBeforeUnmount(() => {
             class="dc-dialog w-[36rem]"
             :breakpoints="{ '1199px': '90vw', '768px': '94vw' }"
             :pt="{
-                header: { class: '!p-3 !rounded-t-[12px] border-b border-[var(--surface-border)] shadow-[0_1px_0_0_rgba(255,255,255,0.06)] bg-gray-100' },
+                header: { class: '!p-3 !rounded-t-[12px] border-b border-[var(--surface-border)] bg-[var(--surface-ground)]' },
                 content: { class: '!p-3' },
-                footer: { class: '!p-0 !rounded-b-[12px] border-t border-[var(--surface-border)] shadow-[0_1px_0_0_rgba(255,255,255,0.06)] bg-gray-100' },
+                footer: { class: '!p-0 !rounded-b-[12px] border-t border-[var(--surface-border)] bg-[var(--surface-ground)]' },
                 pcCloseButton: { root: { class: '!rounded-md hover:!text-red-500' } },
                 pcMaximizeButton: { root: { class: '!rounded-md hover:!text-primary' } }
             }"