fix: the details pane follows its secret's list when it reloads

A cached list is shown at once and reloaded in the background; the
selected secret's details stayed as first shown, old web page
included, until another secret was selected. When the reloaded list
has it changed, the details pane takes the new listing (a value shown
stays shown) and describes it afresh: its cached details came from
the old one.

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

internal/ui/app/cache.go

@@ -1,8 +1,12 @@
 package app
 
 import (
+	"maps"
+	"slices"
 	"time"
 
+	tea "charm.land/bubbletea/v2"
+
 	"git.kebcloud.no/keb/lazysecrets/internal/provider"
 )
 
@@ -48,3 +52,31 @@ func (c cache) rememberCursor(parent, child string) {
 		c.cursor[parent] = child
 	}
 }
+
+// refreshShown shows the selected secret's newer metadata when its list
+// reloaded with it changed from before (a cached list refreshed in the
+// background), and describes it afresh: its cached details came from
+// the old listing.
+func (m *Model) refreshShown(before []provider.Object) tea.Cmd {
+	s, ok := m.secrets.Selected()
+	if !ok || m.secrets.SelectedID() != m.selSecret {
+		return nil // a new selection is shown as usual
+	}
+	i := slices.IndexFunc(before, func(o provider.Object) bool { return o.ID == s.ID })
+	if i < 0 || sameListing(before[i], s) {
+		return nil
+	}
+	m.detail.Refresh(s)
+	delete(m.cache.details, detailKey(s))
+	return m.describe(s)
+}
+
+// sameListing reports whether a and b list the same: what a list
+// says of an object, not what describing it adds.
+func sameListing(a, b provider.Object) bool {
+	enabled := func(e *bool) bool { return e == nil || *e }
+	return a.Name == b.Name && a.Version == b.Version && enabled(a.Enabled) == enabled(b.Enabled) &&
+		a.Updated.Equal(b.Updated) && a.Expires.Equal(b.Expires) && a.ContentType == b.ContentType &&
+		maps.Equal(a.Tags, b.Tags) && a.Reference == b.Reference && a.URL == b.URL &&
+		slices.Equal(a.Attrs, b.Attrs)
+}