Remove redundant astro/tsconfigs/strictest from frontend tsconfig extends

The astro tsconfig chain is completely redundant — tsconfig.base.json
already has all the same strict options, jsx, module, and resolution
settings. Removing it fixes CI ESLint failures where projectService
couldn't resolve astro/tsconfigs/strictest in the container, causing
TypeScript to fall back to a default program without DOM types.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: claude

packages/scout-for-lol/packages/frontend/tsconfig.json

@@ -3,6 +3,6 @@
     "lib": ["ESNext", "DOM", "DOM.Iterable"]
   },
   "exclude": ["dist"],
-  "extends": ["astro/tsconfigs/strictest", "../../tsconfig.base.json"],
+  "extends": ["../../tsconfig.base.json"],
   "include": [".astro/types.d.ts", "**/*", "postcss.config.ts"]
 }