v0.309.0: the fill warning reaches the household in its own language; the root-filesystem disk event pinned end to end (R-521 F7)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/fillwatch/kept_extra_test.go

@@ -15,7 +15,7 @@ func TestFillwatch_ExtraSentenceRidesTheWarning(t *testing.T) {
 		func() []Target { return []Target{{Path: "/mnt/d", Label: "HDD"}} },
 		func(string) *Usage { return &Usage{UsedPercent: 97, AvailGB: 3, UsedGB: 97, TotalGB: 100} })
 	w.SetNotify(func(e Event) { got = append(got, e) })
-	w.SetExtra(func(tg Target) string {
+	w.SetExtra(func(tg Target, _ string) string {
 		if tg.Path == "/mnt/d" {
 			return "KEPT: Nextcloud (126.0 MB)."
 		}