fix: make illegal server-only import errors actually useful (#14155)

* hide useless stack

* defer to graph_analysis in build, so the more useful error appears

* tweak error message

* various fixes

* prevent double-logging

* tidy up a lil

* changeset

* unify

* tidy up

* tweak

* unused

* simplify, update tests

* simplify

* simplify/fix

* tweak

* fix tests

* try this

* while we're here

* getting closer

* ahhh i think this is it

* last bit

* Update packages/kit/src/exports/vite/utils.js

* Update packages/kit/test/apps/dev-only/test/test.js

* test for indirect import

Author: Rich-Harris

.changeset/chubby-shirts-run.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: make illegal server-only import errors actually useful