Redesign das páginas internas no novo design system (AAA) (#2)

* feat(design): redesign das páginas internas no novo design system

Padroniza todas as páginas e componentes internos nos tokens e primitivos
de app/globals.css, com contraste AAA (7:1) nos dois temas e alvos de toque
de 44px.

- Páginas reescritas: glossário, séries, série, seletor, comparador,
  diagnóstico, catálogo, component registry, frameworks, framework, sobre
  e a nova 404.
- Componentes: PageHero e SectionHead novos; BoardCard, CodeExample,
  PinRestrictions, SeriesTabMenu e ConnectionsDiagram refeitos, com abas
  e diálogo acessíveis.
- Remove emojis, cores avulsas por série, caixa alta com tracking, texto
  menor que 12px e os pares slate-*/dark:*.
- Comparador: "mostrar só as diferenças" e leitura de ?chips=.
- Corrige overflow em 320/390px e ajusta accent/copper do tema claro
  para fechar 7:1.
- scripts/auditar-temas.mjs passa a travar paleta crua, dark:, texto
  pequeno, emoji e contraste dos tokens.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016W1xmizFcmXLrmabSvfSuc

* ci: roda lint, auditorias de design e build em cada PR

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016W1xmizFcmXLrmabSvfSuc

---------

Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>

public/marca/espdocs-lockup.svg

@@ -2,9 +2,9 @@
   <title>ESPDocs</title>
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-      <stop offset="0" stop-color="#3b82f6"/>
-      <stop offset="0.55" stop-color="#8b5cf6"/>
-      <stop offset="1" stop-color="#ec4899"/>
+      <stop offset="0" stop-color="#24645f"/>
+      <stop offset="0.55" stop-color="#8a3410"/>
+      <stop offset="1" stop-color="#c4744f"/>
     </linearGradient>
   </defs>
   <g stroke="url(#gl)" stroke-width="3.4" stroke-linecap="round">

public/marca/espdocs-marca.svg

@@ -2,9 +2,9 @@
   <title>ESPDocs</title>
   <defs>
     <linearGradient id="g" x1="6" y1="58" x2="58" y2="6" gradientUnits="userSpaceOnUse">
-      <stop offset="0" stop-color="#3b82f6"/>
-      <stop offset="0.55" stop-color="#8b5cf6"/>
-      <stop offset="1" stop-color="#ec4899"/>
+      <stop offset="0" stop-color="#24645f"/>
+      <stop offset="0.55" stop-color="#8a3410"/>
+      <stop offset="1" stop-color="#c4744f"/>
     </linearGradient>
   </defs>