v0.277.0: kept data loads from the off-site copy too (R-691 (2))

Use my kept data / Load consider the off-site snapshot when it is newer than every local copy or
the only one; the unit is downloaded alone, judged (drive, data, recorded data version) and only
then restored. The page names the copy and its date.

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

REUSE.md

@@ -25,7 +25,7 @@
 | `offsiteRestoreRootFor` | controller/internal/backup/offbox_verify_copies.go | `(drivePath string) string` | THE only place `backups/offsite-restore` is spelled | `offboxRestoreScratchDir` builds on it — the listing/delete surface MUST resolve byte-identical paths to what the restore wrote. Do not re-hardcode the segments (they were open-coded in 3 places before v0.147.0) |
 | `ProtectedHDDPaths` | controller/internal/stacks/delete.go | `(hddPath string) map[string]bool` | Never-delete set (root, appdata, backups, media, kept, legacy felhom-data) | Consult before ANY recursive delete under a drive |
 | `stacks.OldAppDataPaths` / `Manager.ListKept` / `KeepAside` / `DeleteKept` / `FindKept` | controller/internal/stacks/kept.go | `(composePath, hdd)` / `(drives)` / … | Kept data (`09` §3 decision 36): what counts as an app's old data (ONLY `<hdd>/appdata/…` binds), the list, start-fresh, the household's delete | **An action names a kept item by path only through `FindKept`** — `DeleteKept` refuses anything not listed. `KeepAside` is a rename on one drive; never copy, never `RemoveAll` in a rollback (`removeEmptyDirs`) |
-| `backup.KeptDBCopy` / `KeptCopyAt` / `LoadKeptApp` | controller/internal/backup/kept_load.go | `(app, drive)` / `(unitDir, drive, tier)` / … | Which copy can load kept files, and the load as a restore op | A copy counts only with data (DB dump or volume tar) AND its app.yaml `HDD_PATH` = this drive. Installed apps are never offered. Off-site not looked at |
+| `backup.KeptBestCopy` / `KeptDBCopy` / `KeptOffsiteCopies` / `KeptCopyAt` / `LoadKeptApp` / `LoadKeptOffsite` / `KeptCopyKey` | controller/internal/backup/kept_load.go | `(ctx, app, drive)` / `(app, drive)` / `(ctx, apps)` / `(unitDir, drive, tier)` / … | Which copy can load kept files (local tiers + since v0.277.0 the off-site copy, R-691 (2)), the load as a restore op, the copy's name for the page | A copy counts only with data (DB dump or volume tar) AND its app.yaml `HDD_PATH` = this drive. Installed apps are never offered. **The off-site copy is judged only after its unit is downloaded** — `LoadKeptOffsite` refuses an unversioned unit (`07` §6.6) BEFORE `prepare` (a dated folder's move-back); ask the repository once per page (`KeptOffsiteCopies`), never per row. Both pages name a copy through `KeptCopyKey` |
 
 ### Subprocess + timeout + exit-code discipline
 
@@ -386,7 +386,7 @@ Cross-repo edges:
 | dir-size ×6 | controller/internal/stacks/delete.go `getDirSizeBytes`/`getDirSizeHuman`; controller/internal/backup/tier2.go `dirSizeBytes` (du -sb); controller/internal/appexport/estimate.go `dirSize`+`duBytes`; controller/internal/appexport/export.go `calcDirSize`; controller/internal/web/handlers.go `dirSizeHuman` |
 | timeAgo switch body ×2 | controller/internal/web/funcmap.go `timeAgo` vs `timeAgoStr` (identical formatting logic) |
 | CSRF ×2 | controller/internal/web/csrf.go (session HMAC) vs controller/internal/setup/csrf.go (cookie double-submit) — intentional (pre-auth wizard) but unlabeled |
-| Budapest timezone loader ×3 | controller/internal/scheduler/scheduler.go `getBudapestLocation` vs controller/internal/web/funcmap.go `getTimezone` vs controller/internal/quiesce/quiesce.go `budapestLocation` (v0.168.0 window gate — Budapest wall-clock, kept local to avoid a scheduler↔quiesce import edge) |
+| Budapest timezone loader ×4 | controller/internal/scheduler/scheduler.go `getBudapestLocation` vs controller/internal/web/funcmap.go `getTimezone` vs controller/internal/quiesce/quiesce.go `budapestLocation` vs controller/internal/api/kept_install.go `budapest` (v0.277.0, the kept choice's dates) (v0.168.0 window gate — Budapest wall-clock, kept local to avoid a scheduler↔quiesce import edge) |
 | JSON writers ×5, 3 envelope shapes | api `writeJSON`; web `writeDiskJSON`, `jsonResponse`/`jsonError`, `writeDebugJSON` |
 | Safe-name validators ×4 | controller/internal/web/validate.go `validStackName`; controller/internal/api/router.go `validStackParam` (same body — api↔web import cycle); controller/internal/backup/offbox.go `isSafeStackName`; controller/internal/appexport/validate.go `ValidateSegment` (strictest) |
 | DB wait/import ×2 | controller/internal/appbackup/dbdump.go `waitDBReady`/`ImportDump` vs controller/internal/appexport/restore.go `waitForDB`/`importDBDump` |