fix(app): use the same CSP during tauri dev as tauri build (#3894)

* fix(app): use the same CSP during `tauri dev` as `tauri build`

* chore(app-frontend): make Vite WS CSP policy a bit more strict

* tweak: make Tauri CSP config object readable again

At the cost of some extra code in the Vite config side, but I think it's
worth it.

* chore: fix linter warning in app frontend introduced who knows where else

We need a Git hook to ensure these things aren't pushed only to explode
later on or something.

apps/app-frontend/tsconfig.node.json

@@ -10,6 +10,7 @@
     "isolatedModules": true,
     "moduleDetection": "force",
     "noEmit": true,
+    "resolveJsonModule": true,
 
     "strict": true
   },