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]/prd/page.tsx

@@ -374,7 +374,7 @@ export default function PRDPage() {
               {!s.isDone && (
                 <div style={{ marginTop: 6, marginLeft: 36, fontSize: "0.72rem", color: "#c5c0b8" }}>
                   {s.phaseId
-                    ? `Complete the ${s.savedPhase ? s.savedPhase.title : "discovery"} phase in Atlas`
+                    ? `Complete the ${s.savedPhase ? s.savedPhase.title : "discovery"} phase in Vibn`
                     : "Will be generated when PRD is finalized"}
                 </div>
               )}
@@ -383,7 +383,7 @@ export default function PRDPage() {
 
           {doneCount === 0 && (
             <p style={{ fontSize: "0.78rem", color: "#b5b0a6", marginTop: 20, textAlign: "center" }}>
-              Continue chatting with Atlas — saved phases will appear here automatically.
+              Continue chatting with Vibn — saved phases will appear here automatically.
             </p>
           )}
         </div>