Mobile has 100+ imports at ../../../ depth and no alias to shorten them,
while web resolves ~/* to its src. Add "@/*" tsconfig paths plus a Metro
resolveRequest alias (extraNodeModules cannot host it: Metro parses
"@/foo" as the scoped package "@/foo"), mirror it for vitest in the root
vite config, and migrate a bounded set of representative deep imports.

Co-authored-by: Apex <noreply@callstack.com>