fix: keep composer text visible during workspace creation

No-op clearDraft so the prompt stays while worktree + agent are being
created. Screen navigates away on success; text remains for retry on error.

packages/app/src/screens/new-workspace-screen.tsx

@@ -230,7 +230,9 @@ export function NewWorkspaceScreen({
             onChangeText={chatDraft.setText}
             images={chatDraft.images}
             onChangeImages={chatDraft.setImages}
-            clearDraft={chatDraft.clear}
+            clearDraft={() => {
+              // No-op: screen navigates away on success, text should stay for retry on error
+            }}
             autoFocus
             commandDraftConfig={composerState?.commandDraftConfig}
             statusControls={