fix: FileBrowser default dirs, login option on onboarding intro

- Pre-create Documents/Photos/Music/Downloads/Builds dirs for FileBrowser
- Add "Already set up? Log in" link on onboarding intro page
- Prevents users from getting stuck in onboarding loop

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/views/OnboardingIntro.vue

@@ -34,6 +34,15 @@
         >
           Restore from seed phrase
         </a>
+        <a
+          tabindex="0"
+          role="button"
+          class="text-white/50 hover:text-white/80 underline text-sm cursor-pointer mt-2 block text-center onb-cta"
+          @click="goToLogin"
+          @keydown.enter="goToLogin"
+        >
+          Already set up? Log in
+        </a>
       </div>
     </div>
   </div>
@@ -64,6 +73,12 @@ function goToRestore() {
   playNavSound('action')
   router.push('/onboarding/seed-restore').catch(() => {})
 }
+
+function goToLogin() {
+  playNavSound('action')
+  localStorage.setItem('neode_onboarding_complete', '1')
+  router.push('/login').catch(() => {})
+}
 </script>
 
 <style scoped>