Part E: the stale zero-toggle line tells the truth (v0.126.0)

- offboxWarningDisplay(lastWarning, toggledCount) — pure DISPLAY pick, no state mutation:
  a persisted 'nincs mentésre jelölt alkalmazás' run-result is replaced by
  'A kijelölés módosult az utolsó futás óta — a következő távoli mentés már tartalmazza.'
  once ≥1 app is toggled; 0 toggled keeps the v0.123.0 honesty verbatim; every other
  warning (quota, partial) passes through untouched
- replacement renders NEUTRAL (exception-color principle: reassurance, not deviation);
  the untouched original keeps the warn color
- unit + render tests; red-proven (pick removed → 1-enabled case fails at both levels)

controller/internal/web/handlers.go

@@ -653,10 +653,37 @@ func (s *Server) backupsOffboxData(data map[string]interface{}) {
 		}
 	}
 	data["OffboxToggledCount"] = offboxToggled
+	// Part E (v0.126.0): the LastWarning DISPLAY pick — never a state mutation.
+	if offboxTgt != nil {
+		data["OffboxWarningDisplay"] = offboxWarningDisplay(offboxTgt.LastWarning, offboxToggled)
+	} else {
+		data["OffboxWarningDisplay"] = ""
+	}
 	// SLICE 4 soft-quota usage bar (rendered only when a quota is set — shared model).
 	data["OffboxQuotaPct"] = backup.OffboxQuotaPercent(offboxTgt)
 }
 
+// offboxStaleWarningMarker is the substring the zero-toggled offbox run writes into
+// LastWarning (backup/offbox.go); offboxSelectionChangedLine replaces it once the
+// selection has moved on.
+const (
+	offboxStaleWarningMarker   = "nincs mentésre jelölt alkalmazás"
+	offboxSelectionChangedLine = "A kijelölés módosult az utolsó futás óta — a következő távoli mentés már tartalmazza."
+)
+
+// offboxWarningDisplay picks what the Távoli mentés page shows for the persisted
+// Offbox.LastWarning. A zero-toggled run records "Sikeres — nincs mentésre jelölt
+// alkalmazás…"; once the customer HAS toggled apps that line is stale and misleading —
+// replace it with the honest "selection changed, the next run covers it" note.
+// Pure display logic: the persisted LastWarning is never touched, and every other
+// warning (quota, partial failure) passes through verbatim.
+func offboxWarningDisplay(lastWarning string, toggledCount int) string {
+	if toggledCount >= 1 && strings.Contains(lastWarning, offboxStaleWarningMarker) {
+		return offboxSelectionChangedLine
+	}
+	return lastWarning
+}
+
 // backupsHandler renders the Áttekintés page: storage overview, whole-guest Rendszermentés and
 // the status stat cards.
 func (s *Server) backupsHandler(w http.ResponseWriter, r *http.Request) {

controller/internal/web/offbox_warning_display_test.go

@@ -0,0 +1,73 @@
+package web
+
+import (
+	"strings"
+	"testing"
+
+	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
+)
+
+// v0.126.0 Part E — the stale zero-toggle warning line tells the truth. Display-pick only:
+// the persisted LastWarning is never mutated; the page swaps the stale "nincs mentésre
+// jelölt alkalmazás" run-result for the selection-changed note once ≥1 app is toggled.
+// COMPANION red-proof (recorded in REPORT): make offboxWarningDisplay return lastWarning
+// unconditionally → TestOffboxWarningDisplay_Pick's 1-enabled case FAILS.
+
+const staleZeroToggleWarning = "Sikeres — nincs mentésre jelölt alkalmazás volt a futáskor."
+
+func TestOffboxWarningDisplay_Pick(t *testing.T) {
+	// warning + ≥1 enabled → the replacement line
+	if got := offboxWarningDisplay(staleZeroToggleWarning, 1); got != offboxSelectionChangedLine {
+		t.Errorf("stale warning + 1 toggled: got %q, want the selection-changed line", got)
+	}
+	// warning + 0 enabled → the original line, verbatim (the v0.123.0 honesty stays)
+	if got := offboxWarningDisplay(staleZeroToggleWarning, 0); got != staleZeroToggleWarning {
+		t.Errorf("stale warning + 0 toggled: got %q, want the original warning unchanged", got)
+	}
+	// any OTHER warning passes through regardless of toggles (quota, partial failure)
+	quota := "A tároló a keret 84%-át használja (42/50 GB)."
+	if got := offboxWarningDisplay(quota, 3); got != quota {
+		t.Errorf("non-stale warning must pass through verbatim, got %q", got)
+	}
+	// no warning → no line
+	if got := offboxWarningDisplay("", 2); got != "" {
+		t.Errorf("empty warning must stay empty, got %q", got)
+	}
+}
+
+func TestOffboxWarningDisplay_RemotePageRender(t *testing.T) {
+	// ≥1 toggled: the page shows the replacement, NOT the stale line.
+	data := appRowSplitData()
+	data["Offbox"] = &settings.OffboxTarget{
+		Enabled: true, Host: "nas.local", LastStatus: "ok", EscrowState: "escrowed",
+		LastWarning: staleZeroToggleWarning,
+	}
+	data["OffboxWarningDisplay"] = offboxWarningDisplay(staleZeroToggleWarning, 1)
+	html := renderBackupPage(t, "backups_remote", data)
+	if !strings.Contains(html, offboxSelectionChangedLine) {
+		t.Error("selection-changed note missing with 1 app toggled")
+	}
+	if strings.Contains(html, staleZeroToggleWarning) {
+		t.Error("the stale zero-toggle line still renders alongside the replacement")
+	}
+
+	// 0 toggled: the original warning + the v0.123.0 zero-toggle hint, unchanged.
+	data = appRowSplitData()
+	data["OffboxApps"] = []OffboxAppRow{{Name: "calibre-web", DisplayName: "Calibre-Web", Slug: "calibre-web", Enabled: false}}
+	data["OffboxToggledCount"] = 0
+	data["Offbox"] = &settings.OffboxTarget{
+		Enabled: true, Host: "nas.local", LastStatus: "ok", EscrowState: "escrowed",
+		LastWarning: staleZeroToggleWarning,
+	}
+	data["OffboxWarningDisplay"] = offboxWarningDisplay(staleZeroToggleWarning, 0)
+	html = renderBackupPage(t, "backups_remote", data)
+	if !strings.Contains(html, staleZeroToggleWarning) {
+		t.Error("0 toggled: the original run warning must render unchanged")
+	}
+	if strings.Contains(html, offboxSelectionChangedLine) {
+		t.Error("0 toggled: the selection-changed note must NOT render")
+	}
+	if !strings.Contains(html, "Nincs távoli mentésre jelölt alkalmazás — jelölj ki legalább egyet.") {
+		t.Error("0 toggled: the v0.123.0 hint must stay")
+	}
+}

controller/internal/web/templates/backups_remote.html

@@ -50,7 +50,9 @@
     </div>
     {{end}}
     {{if .Offbox.LastError}}<p class="form-hint" style="color:var(--crit)">Utolsó hiba: {{.Offbox.LastError}}</p>{{end}}
-    {{if .Offbox.LastWarning}}<p class="form-hint" style="color:var(--warn)">{{.Offbox.LastWarning}}</p>{{end}}
+    {{/* Part E: display pick — a stale zero-toggle warning is replaced once the selection
+         changed (neutral color: the replacement is reassurance, not a deviation). */}}
+    {{if .OffboxWarningDisplay}}<p class="form-hint"{{if eq .OffboxWarningDisplay .Offbox.LastWarning}} style="color:var(--warn)"{{end}}>{{.OffboxWarningDisplay}}</p>{{end}}
     {{if and .OffboxConfigured (ne .Offbox.EscrowState "escrowed")}}
     <div class="card" style="border-left:3px solid var(--warn);margin:.75rem 0;padding:.75rem 1rem">
         <p class="form-hint" style="color:var(--warn);margin:0 0 .5rem">A távoli mentés a kulcs letétbe helyezésére vár — a mentés addig nem fut (így nem keletkezik visszaállíthatatlan másolat). Futtasd a letéti szertartást, majd erősítsd meg.</p>