perf: reduce redundant fetches and improve list render efficiency

- Remove no-op per-row task from RepositoryListView; loadMoreIfNeeded
  is a stub for repos so each row was allocating a Task that did nothing
- Fix BuildListView auto-refresh stopping permanently after navigating
  away; startAutoRefresh now runs unconditionally on task so it restarts
  on every reappear, not just first load
- Add lastRefreshed tracking to HomeViewModel with a needsRefresh(after:)
  helper; HomeView and WorkView scene-activation handlers now skip
  loadDashboard() if the data is less than 60 seconds old
- Add 120-second TTL to repository build status refresh; statuses are
  no longer re-fetched on every tab appear, only when stale or when the
  user explicitly pulls to refresh (forceRefresh: true)

Implements: https://todo.sr.ht/~ccleberg/hutch/56

1 files changed, 3 insertions, 1 deletions

diff --git a/Hutch/Views/Builds/BuildListView.swift b/Hutch/Views/Builds/BuildListView.swift
index aa98066..6f3f934 100644
--- a/Hutch/Views/Builds/BuildListView.swift
+++ b/Hutch/Views/Builds/BuildListView.swift
@@ -108,8 +108,10 @@ struct BuildListView: View {
                 vm.repoFilter = savedRepoFilter
                 viewModel = vm
                 await vm.loadJobs()
-                vm.startAutoRefresh(interval: autoRefreshInterval)
             }
+            // Restart auto-refresh every time the view (re)appears, since
+            // onDisappear stops it when navigating away.
+            viewModel?.startAutoRefresh(interval: autoRefreshInterval)
         }
         .onDisappear {
             viewModel?.stopAutoRefresh()