fix(ui): resolve multi-second UI freeze on project selection (#475)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: matt2e

apps/staged/src-tauri/src/branches.rs

@@ -694,39 +694,10 @@ pub fn list_branches_for_project(
         .list_branches_for_project(&project_id)
         .map_err(|e| e.to_string())?;
 
-    // Eagerly populate the workstation ID cache for any remote workspace
-    // names we haven't seen yet, so the frontend has IDs on first load.
-    {
-        let cache = workstation_id_cache().lock().unwrap();
-        let missing: Vec<String> = branches
-            .iter()
-            .filter(|b| b.branch_type == store::BranchType::Remote)
-            .filter_map(|b| b.workspace_name.clone())
-            .filter(|name| !cache.contains_key(name))
-            .collect::<std::collections::HashSet<_>>()
-            .into_iter()
-            .collect();
-        drop(cache);
-        for name in missing {
-            match blox::ws_info(&name) {
-                Ok(info) => {
-                    log::debug!(
-                        "[list_branches] ws_info({}) returned workstation_id={:?}",
-                        name,
-                        info.workstation_id,
-                    );
-                    if let Some(ws_id) = info.workstation_id {
-                        if let Ok(mut cache) = workstation_id_cache().lock() {
-                            cache.insert(name, ws_id);
-                        }
-                    }
-                }
-                Err(e) => {
-                    log::debug!("[list_branches] ws_info({}) failed: {}", name, e);
-                }
-            }
-        }
-    }
+    // NOTE: workstation IDs for remote branches are populated lazily by
+    // poll_all_workspace_statuses (a single batched `ws_list` call) rather
+    // than eagerly here. Eager per-workspace `ws_info` calls were serial and
+    // each took ~1s, causing multi-second UI freezes on project load.
 
     let mut result = Vec::with_capacity(branches.len());
     for branch in branches {

apps/staged/src/App.svelte

@@ -217,14 +217,12 @@
     // regardless of which view the user is on. See sessionStatusListener.ts.
     unlistenSessionStatus = await listenForSessionStatus();
 
-    const t0 = performance.now();
     try {
       await initPreferences();
     } catch (e) {
       console.error('Failed to initialize preferences, rendering with defaults:', e);
       preferences.loaded = true;
     }
-    console.debug(`[Staged] preferences ready in ${Math.round(performance.now() - t0)}ms`);
 
     // Restore the last viewed project (persistent store is now ready).
     try {

apps/staged/src/lib/features/branches/BranchCardActionsBar.svelte

@@ -129,8 +129,10 @@
   // =========================================================================
   // Remote endpoint URL rewriting
   // =========================================================================
+  let canResolveEndpoint = $derived(!isRemote || !!branch.workstationId);
+
   function getEndpointCopyUrl(endpoint: string): string {
-    if (!isRemote || !branch.workstationId) return endpoint;
+    if (!canResolveEndpoint) return endpoint;
     try {
       const parsed = new URL(endpoint);
       const port = parsed.port || (parsed.protocol === 'https:' ? '443' : '80');
@@ -615,7 +617,7 @@
     {@const isStopping = execution && stoppingExecutions.has(execution.executionId)}
     {@const showStopIcon = altHeld && isRunning && !isStopping}
     {@const phase = execution ? runPhases.get(execution.executionId) : undefined}
-    {@const hasEndpoint = phase?.type === 'running' && !!phase.endpoint}
+    {@const hasEndpoint = phase?.type === 'running' && !!phase.endpoint && canResolveEndpoint}
     {@const copyUrl =
       hasEndpoint && phase?.type === 'running' && phase.endpoint
         ? getEndpointCopyUrl(phase.endpoint)