chore: upgrade vite to 8.x, laravel-vite-plugin to 3.x, shiki to 4.x

- vite 7.3.3 → 8.0.13 (now using Rolldown bundler — build time ~3x faster)
- laravel-vite-plugin 2.1.0 → 3.1.0
- shiki 3.23.0 → 4.0.2 (transitive only, not imported in app code)

Node 26.1.0 satisfies vite 8's Node 22+ requirement.
yarn build passes; only preexisting tseep eval warnings remain.

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

package.json

@@ -14,17 +14,17 @@
         "date-fns": "^4.1.0",
         "flatpickr": "^4.6.13",
         "laravel-echo": "^2.3.0",
-        "laravel-vite-plugin": "^2",
+        "laravel-vite-plugin": "^3.0.0",
         "nostr-tools": "^2.23.0",
         "postcss": "^8.4.41",
         "pusher-js": "^8.4.0",
         "tailwindcss": "^4.1.18",
-        "vite": "^7",
+        "vite": "^8.0.0",
         "webln": "^0.3.2"
     },
     "dependencies": {
         "@tailwindcss/vite": "^4.1.18",
         "concurrently": "^9.2.1",
-        "shiki": "^3.0.0"
+        "shiki": "^4.0.0"
     }
 }