rename: replace all user-facing 'Atlas' references with 'Vibn'

Updated UI text in: project-shell (tab label), AtlasChat (sender name),
FreshIdeaMain, TypeSelector, MigrateSetup, ChatImportSetup, FreshIdeaSetup,
CodeImportSetup, prd/page, build/page, projects/page, deployment/page,
activity/page, layout (page title/description), atlas-chat API route.
Code identifiers (AtlasChat component name, file names) unchanged.

Made-with: Cursor

app/[workspace]/project/[projectId]/deployment/page.tsx

@@ -140,7 +140,7 @@ export default function DeploymentPage() {
             <div style={{ padding: "18px 0", textAlign: "center" }}>
               <p style={{ fontSize: "0.82rem", color: "#a09a90", marginBottom: 12 }}>
                 {!hasPRD
-                  ? "Complete your PRD with Atlas first, then build and deploy."
+                  ? "Complete your PRD with Vibn first, then build and deploy."
                   : !hasRepo
                   ? "No repository yet — the Architect agent will scaffold one from your PRD."
                   : "No deployment yet — kick off a build to get a live URL."}