Preview: Block ausserhalb des Formulars, Validierung und Feinschliff

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tests/unit/previewEnv.test.mjs

@@ -2,7 +2,7 @@ import test from 'node:test'
 import assert from 'node:assert/strict'
 import { loadModule } from './load.mjs'
 
-const { isValidEnvName, buildEnvPayload, dotColor, isDevPreview } = await loadModule('src/lib/previewEnv.js')
+const { isValidEnvName, buildEnvPayload, dotColor, isDevPreview, envValueTooLong, MAX_ENV_VARS } = await loadModule('src/lib/previewEnv.js')
 
 test('isValidEnvName', () => {
   assert.equal(isValidEnvName('VITE_API_URL'), true)
@@ -35,3 +35,10 @@ test('isDevPreview', () => {
   assert.equal(isDevPreview({ mode: 'build', detected: 'dev:npm' }), false)
   assert.equal(isDevPreview(null), false)
 })
+
+test('envValueTooLong zählt Bytes', () => {
+  assert.equal(envValueTooLong('a'.repeat(4096)), false)
+  assert.equal(envValueTooLong('a'.repeat(4097)), true)
+  assert.equal(envValueTooLong('ä'.repeat(2049)), true)
+  assert.equal(MAX_ENV_VARS, 30)
+})