A warmer, friendlier admin: first pass

- The INBUXA palette on warm surfaces, softer cards, buttons and inputs, and
  self-hosted Inter and Space Grotesk.
- Each section's icon sits on a colored tile, colored by what the section is
  about.
- The sidebar gets a guide line for sub-pages and a labeled Management /
  Settings / Account switch, and folds to a rail of tiles (remembered).
- Every page has a header with its section's tile.
- Fields and pages with no label of their own are spelled out in words
  (defaultCertificateId becomes Default certificate ID).
- The dashboard greets you, and its stat cards wear colored tiles.
- Unavailable live numbers are a calm note, not an error.
- The cat appears in empty lists and while loading.
- Chart colors work again: they were hex values wrapped in hsl().

package.json

@@ -17,6 +17,8 @@
   },
   "dependencies": {
     "@daypicker/react": "^10.0.1",
+    "@fontsource-variable/inter": "^5.3.0",
+    "@fontsource-variable/space-grotesk": "^5.3.0",
     "@radix-ui/react-alert-dialog": "^1.1.23",
     "@radix-ui/react-checkbox": "^1.3.11",
     "@radix-ui/react-collapsible": "^1.1.20",
@@ -68,4 +70,4 @@
     "vite": "^8.2.0",
     "vitest": "^4.1.10"
   }
-}
+}