Enabling noUncheckedSideEffectImports globally (#2972)

This is one of the recommended settings of latest Typescript. It checks
if side effect imports do exist and correct.
Since the framework does have side effects via `zod-plugin`, this
setting makes sense to activate.

https://www.typescriptlang.org/tsconfig/#noUncheckedSideEffectImports

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Maintenance-only update: internal TypeScript compiler configuration
adjusted for development/build processes. No changes to functionality,
interface, performance, or compatibility. No impact on data, settings,
or user workflows. App behavior remains the same across all platforms.
No action required.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: RobinTail

tsconfig.json

@@ -3,6 +3,7 @@
   "compilerOptions": {
     "noImplicitAny": true,
     "noImplicitOverride": true,
+    "noUncheckedSideEffectImports": true,
     "strictNullChecks": true,
     "types": ["vitest/globals"]
   }