chore(deps): upgrade vite 6->8, vite-plugin-svelte 5->7, kit 2.55

- vite 8.0.3: Rolldown replaces Rollup+esbuild as build engine
- @sveltejs/vite-plugin-svelte 7.0.0: requires vite 8, inspector integrated
- @sveltejs/kit 2.55.0: vite 8 compatibility
- vitest 4.1.2: stable vite 8 peer dep
- Remove esbuild override (no longer needed with Rolldown)

Build, tests (92/92), and svelte-check all pass.

cc

package.json

@@ -35,19 +35,18 @@
   },
   "devDependencies": {
     "@sveltejs/adapter-static": "^3.0.6",
-    "@sveltejs/kit": "^2.52.2",
-    "@sveltejs/vite-plugin-svelte": "^5.1.1",
+    "@sveltejs/kit": "^2.55.0",
+    "@sveltejs/vite-plugin-svelte": "^7.0.0",
     "@tauri-apps/cli": "^2",
     "@testing-library/svelte": "^5.3.1",
     "jsdom": "^27.4.0",
     "svelte": "^5.55.0",
     "svelte-check": "^4.4.5",
     "typescript": "~5.9.3",
-    "vite": "^6.0.3",
-    "vitest": "^4.1.0"
+    "vite": "^8.0.3",
+    "vitest": "^4.1.2"
   },
   "overrides": {
-    "esbuild": "^0.25.0",
     "cookie": "^0.7.0"
   }
 }