L12 Zeiterfassung: Services für Nachtrag, Freigabe, Auto-Wechsel und Für heute beenden

time-entries.ts (manuelle Einträge, Korrekturvorschläge, Freigabe/Ablehnung mit
Team-Scope), Sessions in inTransaction mit switchFromOther, stopForToday,
Segmentwechsel und getMyActiveSession. Sync-Ops time.add_manual,
time.propose_correction, session.stop_day, session.segment inkl. optimistischer
Offline-Ansicht. Bericht, Zeiten-Tab, Dashboard und Lotse zählen nur freigegebene
Zeiten; Abrechnungsfreigabe blockiert bei offenen Zeiten. Empfänger und Links der
Zeit-Events. Notdienst-Start pausiert eine laufende Uhr automatisch.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/lib/offline/outbox-core.ts

@@ -21,7 +21,7 @@ export const BACKOFF_BASE_MS = 2_000;
 export const BACKOFF_MAX_MS = 5 * 60_000;
 
 /** Ops that change WorkOrder.version on the server (status changes). */
-export const VERSION_CHANGING_OPS: readonly SyncOpType[] = ["session.start", "session.pause", "session.resume", "session.end", "work_order.transition", "report.submit"];
+export const VERSION_CHANGING_OPS: readonly SyncOpType[] = ["session.start", "session.pause", "session.resume", "session.end", "session.stop_day", "session.segment", "work_order.transition", "report.submit"];
 
 const TRANSIENT_CODES = new Set<OutboxError["code"]>(["internal", "network"]);
 
@@ -337,7 +337,13 @@ export function problemKey(e: Pick<OutboxEntry, "status" | "opType" | "lastError
     case "blocked":
       return "blocked";
     case "invalid":
+      // L12: plain-language texts for rejected time entries
+      if (e.lastError?.message === "overlap") return "timeOverlap";
+      if (["too_old", "in_future", "too_long", "end_before_start"].includes(e.lastError?.message ?? "")) return "timeWindow";
       return "invalid";
+    case "conflict":
+      if (e.lastError?.message?.startsWith("other_session_running")) return "otherSession";
+      return "internal";
     case "upload":
       return "upload";
     case "unauthorized":