feat(website): finish responsive polish

Self-host the Inter and Space Grotesk variable fonts, tighten the mobile layout, hide oversized edge marks on narrow screens, and add keyboard focus plus reduced-motion safeguards. Exclude website and documentation-only changes from the desktop CI workflow.

pnpm-lock.yaml

@@ -78,6 +78,12 @@ importers:
 
   website:
     dependencies:
+      '@fontsource-variable/inter':
+        specifier: 5.2.8
+        version: 5.2.8
+      '@fontsource-variable/space-grotesk':
+        specifier: 5.2.10
+        version: 5.2.10
       framer-motion:
         specifier: ^12.38.0
         version: 12.38.0(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
@@ -357,6 +363,12 @@ packages:
     cpu: [x64]
     os: [win32]
 
+  '@fontsource-variable/inter@5.2.8':
+    resolution: {integrity: sha512-kOfP2D+ykbcX/P3IFnokOhVRNoTozo5/JxhAIVYLpea/UBmCQ/YWPBfWIDuBImXX/15KH+eKh4xpEUyS2sQQGQ==}
+
+  '@fontsource-variable/space-grotesk@5.2.10':
+    resolution: {integrity: sha512-yJQO/o35/hAP3CFnpdFTwQku2yzJOae2HIpBmqkOVoxhhXJaQP3g+b6Jrz7u+eI7A5ZdCIf88uMWpBJdFiGr5w==}
+
   '@img/colour@1.1.0':
     resolution: {integrity: sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ==}
     engines: {node: '>=18'}
@@ -1466,6 +1478,10 @@ snapshots:
   '@esbuild/win32-x64@0.27.7':
     optional: true
 
+  '@fontsource-variable/inter@5.2.8': {}
+
+  '@fontsource-variable/space-grotesk@5.2.10': {}
+
   '@img/colour@1.1.0': {}
 
   '@img/sharp-darwin-arm64@0.34.5':