refactor: remove legacy workspace UI state

frontend/src/shell/SteerInput.tsx

@@ -203,8 +203,6 @@ export function ComposerFooter() {
       workspacePolicyGate.rejectSummary(workspace);
     } else if (selectedWorkspace && !selectedWorkspaceHasRevision) {
       workspacePolicyGate.rejectSummary(workspace);
-    } else if (selectedWorkspace?.revision?.state === "migration_required") {
-      workspacePolicyGate.rejectSummary(workspace);
     } else if (selectedWorkspace?.revision) {
       workspacePolicyGate.select(workspace);
     } else {
@@ -243,7 +241,6 @@ export function ComposerFooter() {
     if (patch.workspaceId && patch.workspaceId !== workspace) {
       const selected = workspaces.find((candidate) => candidate.id === patch.workspaceId);
       if (selected && !selected.revision) workspacePolicyGate.rejectSummary(patch.workspaceId);
-      else if (selected?.revision?.state === "migration_required") workspacePolicyGate.rejectSummary(patch.workspaceId);
       else if (selected?.revision) workspacePolicyGate.select(patch.workspaceId);
       else workspacePolicyGate.allowLegacy(patch.workspaceId);
     }
@@ -269,8 +266,8 @@ export function ComposerFooter() {
           {workspaces.length === 0 ? (
             <option value="">— workspace —</option>
           ) : (
-            workspaces.filter((w) => w.revision && w.revision.state !== "migration_required").map((w) => (
-              <option key={w.name} value={w.name}>
+            workspaces.filter((w) => w.revision).map((w) => (
+              <option key={w.id} value={w.id}>
                 {w.name}
               </option>
             ))