feat: keep what was loaded between runs, and start where you left off

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/app/cache.go

@@ -10,8 +10,8 @@ import (
 // entries are still shown immediately, then reloaded in the background.
 const cacheTTL = 2 * time.Minute
 
-// cache holds metadata for this session only. It never holds secret values
-// or errors, and is never written to disk.
+// cache holds metadata: never secret values or errors. It's kept between
+// runs in the cache file (persist.go).
 type cache struct {
 	containers map[string]entry[[]provider.Container] // by source key
 	objects    map[string]entry[[]provider.Object]    // by container key (ID|type)