controller v0.267.0: tests off DooPlex's Docker, cut-off copies refused, two pages true

R-650: internal/dockerexec — every docker exec routed through it; under
go test a real docker is refused (opt-in FELHOM_TEST_REAL_DOCKER=1; a stub
under the temp dir is allowed). api/stacks/web tests run under a silent
stub (TestMain). TestR650_NoBareDockerExec pins it repo-wide.
R-640: a dump without its engine's completion marker is refused before
the first mutation (unit + off-site restore) and again before any load.
R-499: the Tier-2 page's system-disk sentence has four true branches.
R-518: the backup button states the measured ~8 min stop.
R-626: measured on 9202, not reproduced.

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

controller/internal/web/i18n_cases_b_test.go

@@ -288,6 +288,29 @@ func i18nCasesB() []i18nCase {
 			d["Tier2"] = m{"IsHDDApp": false, "Disabled": false, "NoTarget": true}
 			return d
 		}},
+		// R-499 (v0.267.0): the system-disk sentence has one branch per whole-system backup target
+		// state. tier2_not_hdd above carries no SystemBackup, which renders the `unknown` branch.
+		{"tier2_not_hdd_protected", "tier2_config", func() map[string]interface{} {
+			d := i18nLayoutData("backups", "Második mentés beállítása")
+			d["DisplayName"], d["StackName"] = "Private Bin", "privatebin"
+			d["Tier2"] = m{"IsHDDApp": false}
+			d["SystemBackup"] = "protected"
+			return d
+		}},
+		{"tier2_not_hdd_same_disk", "tier2_config", func() map[string]interface{} {
+			d := i18nLayoutData("backups", "Második mentés beállítása")
+			d["DisplayName"], d["StackName"] = "Private Bin", "privatebin"
+			d["Tier2"] = m{"IsHDDApp": false}
+			d["SystemBackup"] = "same_disk"
+			return d
+		}},
+		{"tier2_not_hdd_absent", "tier2_config", func() map[string]interface{} {
+			d := i18nLayoutData("backups", "Második mentés beállítása")
+			d["DisplayName"], d["StackName"] = "Private Bin", "privatebin"
+			d["Tier2"] = m{"IsHDDApp": false}
+			d["SystemBackup"] = "absent"
+			return d
+		}},
 		{"tier2_notarget_disabled", "tier2_config", func() map[string]interface{} {
 			d := i18nLayoutData("backups", "Második mentés beállítása")
 			d["DisplayName"], d["StackName"] = "Immich Photos", "immich"