Rip out Theia, ship P5.1 attach E2E + Justine UI work-in-progress

Theia rip-out:
- Delete app/api/theia-auth/route.ts (Traefik ForwardAuth shim)
- Delete app/api/projects/[projectId]/workspace/route.ts and
  app/api/projects/prewarm/route.ts (Cloud Run Theia provisioning)
- Delete lib/cloud-run-workspace.ts and lib/coolify-workspace.ts
- Strip provisionTheiaWorkspace + theiaWorkspaceUrl/theiaAppUuid/
  theiaError from app/api/projects/create/route.ts response
- Remove Theia callbackUrl branch in app/auth/page.tsx
- Drop "Open in Theia" button + xterm/Theia PTY copy in build/page.tsx
- Drop theiaWorkspaceUrl from deployment/page.tsx Project type
- Strip Theia IDE line + theia-code-os from advisor + agent-chat
  context strings
- Scrub Theia mention from lib/auth/workspace-auth.ts comment

P5.1 (custom apex domains + DNS):
- lib/coolify.ts + lib/opensrs.ts: nameserver normalization, OpenSRS
  XML auth, Cloud DNS plumbing
- scripts/smoke-attach-e2e.ts: full prod GCP + sandbox OpenSRS +
  prod Coolify smoke covering register/zone/A/NS/PATCH/cleanup

In-progress (Justine onboarding/build, MVP setup, agent telemetry):
- New (justine)/stories, project (home) layouts, mvp-setup, run, tasks
  routes + supporting components
- Project shell + sidebar + nav refactor for the Stackless palette
- Agent session API hardening (sessions, events, stream, approve,
  retry, stop) + atlas-chat, advisor, design-surfaces refresh
- New scripts/sync-db-url-from-coolify.mjs +
  scripts/prisma-db-push.mjs + docker-compose.local-db.yml for
  local Prisma workflows
- lib/dev-bypass.ts, lib/chat-context-refs.ts, lib/prd-sections.ts
- Misc: stories CSS, debug/prisma route, modal-theme, BuildLivePlanPanel

Made-with: Cursor

app/auth/page.tsx

@@ -16,23 +16,17 @@ function AuthPageInner() {
 
   useEffect(() => {
     if (status === "authenticated" && session?.user?.email) {
-      const callbackUrl = searchParams.get("callbackUrl");
-      // Only follow external callbackUrls we control (Theia subdomain)
-      if (callbackUrl && callbackUrl.startsWith("https://theia.vibnai.com")) {
-        window.location.href = callbackUrl;
-      } else {
-        const workspace = deriveWorkspace(session.user.email);
-        router.push(`/${workspace}/projects`);
-      }
+      const workspace = deriveWorkspace(session.user.email);
+      router.push(`/${workspace}/projects`);
     }
   }, [status, session, router, searchParams]);
 
   if (status === "loading") {
     return (
-      <div className="flex min-h-screen items-center justify-center bg-background">
-        <div className="text-center">
-          <div className="h-8 w-8 animate-spin rounded-full border-4 border-primary border-t-transparent mx-auto mb-4" />
-          <p className="text-muted-foreground">Loading authentication...</p>
+      <div className="justine-auth-inner">
+        <div className="justine-auth-loading-wrap">
+          <div className="justine-auth-spinner" aria-hidden />
+          <p className="justine-auth-loading-text">Loading authentication…</p>
         </div>
       </div>
     );