Rediseño impeccable v2: refresh visual de todo el sistema

Segunda iteración del rediseño (sesión separada con skill impeccable).
Toca prácticamente toda la UI: layout base, tokens (global.css),
todas las páginas de alumno y admin, componentes de solicitudes,
inventario, catálogo, filtros, toaster y modales.

Docs y sistema:
- DESIGN.md y PRODUCT.md actualizados con la nueva iteración.
- .impeccable/design.json refleja tokens vigentes.
- .impeccable/review/ contiene screenshots de la revisión visual.

Dependencias:
- Añade @fontsource-variable/jetbrains-mono (fuente monoespaciada).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package-lock.json

@@ -11,6 +11,7 @@
         "@astrojs/node": "^11.1.2",
         "@astrojs/react": "^6.0.2",
         "@fontsource-variable/inter": "^5.3.0",
+        "@fontsource-variable/jetbrains-mono": "^5.3.0",
         "@supabase/ssr": "^0.12.4",
         "@supabase/supabase-js": "^2.112.3",
         "@tailwindcss/vite": "^4.3.3",
@@ -1256,6 +1257,15 @@
         "url": "https://github.com/sponsors/ayuhito"
       }
     },
+    "node_modules/@fontsource-variable/jetbrains-mono": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/@fontsource-variable/jetbrains-mono/-/jetbrains-mono-5.3.0.tgz",
+      "integrity": "sha512-F32xpS2NsGYoQi2ADSkKTgpJj7ozajsGgDJ8woTnqjmIB+dxDIqImjl4pXZVEExu8UFZ2ndhmX18EBS/hdz3Lw==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@img/colour": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.1.0.tgz",