Use global ticket detail entrypoint

frontend/src/views/AnalysisPage.tsx

@@ -836,7 +836,11 @@ export function AnalysisPage({ onNavigate }: AnalysisPageProps) {
                           <TicketStatus ticket={ticket} />
                         </TableCell>
                         <TableCell className="text-right">
-                          <Button variant="ghost" size="sm" onClick={() => onNavigate(`/analysis/${periodType}/${period}/tickets/${ticket.id}`)}>
+                          <Button
+                            variant="ghost"
+                            size="sm"
+                            onClick={() => onNavigate(`/tickets/${ticket.id}?month=${periodType === "day" ? period.slice(0, 7) : period}`)}
+                          >
                             Öffnen
                             <ExternalLink className="size-4" />
                           </Button>
@@ -887,7 +891,12 @@ export function AnalysisPage({ onNavigate }: AnalysisPageProps) {
                         <p className="font-medium">{ticket.billed_count}</p>
                       </div>
                     </div>
-                    <Button className="w-full" size="sm" variant="secondary" onClick={() => onNavigate(`/analysis/${periodType}/${period}/tickets/${ticket.id}`)}>
+                    <Button
+                      className="w-full"
+                      size="sm"
+                      variant="secondary"
+                      onClick={() => onNavigate(`/tickets/${ticket.id}?month=${periodType === "day" ? period.slice(0, 7) : period}`)}
+                    >
                       Öffnen
                       <ExternalLink className="size-4" />
                     </Button>

frontend/src/views/MonthlyClosePage.tsx

@@ -103,7 +103,7 @@ function OpenTicketItem({ group, month, onNavigate }: { group: OpenTicketGroup;
         <p className={`text-sm font-medium ${trackedTextClass}`}>{formatMinutes(group.totalMinutes)} offen zu bewerten</p>
       </div>
       <div className="flex justify-end">
-        <Button variant="secondary" size="sm" onClick={() => onNavigate(`/analysis/month/${month}/tickets/${group.ticketId}`)}>
+        <Button variant="secondary" size="sm" onClick={() => onNavigate(`/tickets/${group.ticketId}?month=${month}`)}>
           Ticket öffnen
           <ExternalLink className="size-4" />
         </Button>
@@ -145,7 +145,7 @@ function CrmDayItem({
         <Button variant={isAcknowledged ? "secondary" : "ghost"} size="sm" disabled={busy} onClick={() => onSetAcknowledgement(item, !isAcknowledged)}>
           {isAcknowledged ? "Zurücknehmen" : "Zur Kenntnis"}
         </Button>
-        <Button variant="secondary" size="sm" onClick={() => onNavigate(`/analysis/day/${item.day}/tickets/${item.ticket_id}`)}>
+        <Button variant="secondary" size="sm" onClick={() => onNavigate(`/tickets/${item.ticket_id}?month=${item.day.slice(0, 7)}`)}>
           Tag öffnen
           <ExternalLink className="size-4" />
         </Button>

frontend/src/views/StatisticsPage.tsx

@@ -342,7 +342,7 @@ function TicketHotspot({ ticket, month, onNavigate }: { ticket: StatisticsTicket
           <span className={deltaTextClass(ticket.crm_delta_minutes)}>{formatTeamspaceDelta(ticket.crm_delta_minutes)}</span>
         </div>
       </div>
-      <Button variant="secondary" size="sm" onClick={() => onNavigate(`/analysis/month/${month}/tickets/${ticket.ticket_id}`)}>
+      <Button variant="secondary" size="sm" onClick={() => onNavigate(`/tickets/${ticket.ticket_id}?month=${month}`)}>
         Öffnen
         <ExternalLink className="size-4" />
       </Button>

frontend/src/views/TicketDetailPage.tsx

@@ -21,7 +21,7 @@ import {
   updateTicket,
   updateTicketDayBilling
 } from "../api";
-import { currentDay, formatDate, formatDateTime, formatMinutes, formatTimeRange } from "../format";
+import { currentDay, currentMonth, formatDate, formatDateTime, formatMinutes, formatTimeRange } from "../format";
 import type { BillingStatus, PeriodType, SessionEntry, TicketDetailPeriodType, TicketPeriod, WorkType } from "../types";
 import { cn } from "@/lib/utils";
 
@@ -152,6 +152,7 @@ function isPartialHoursInput(value: string) {
 }
 
 export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onOpenTicketChange }: TicketDetailPageProps) {
+  const initialGlobalMonthFilter = periodType === "all" && period !== "all" ? period : currentMonth();
   const [data, setData] = useState<TicketPeriod | null>(null);
   const [loadingId, setLoadingId] = useState<string | null>(null);
   const [deletingId, setDeletingId] = useState<string | null>(null);
@@ -173,7 +174,7 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onO
   const [savingDayBillingKey, setSavingDayBillingKey] = useState<string | null>(null);
   const [ticketSession, setTicketSession] = useState<TicketSessionFormState>(() => emptyTicketSessionForm());
   const [savingTicketSession, setSavingTicketSession] = useState(false);
-  const [globalMonthFilter, setGlobalMonthFilter] = useState("all");
+  const [globalMonthFilter, setGlobalMonthFilter] = useState(initialGlobalMonthFilter);
   const [globalStatusFilter, setGlobalStatusFilter] = useState<"all" | "open" | "billed" | "non_billable">("all");
   const [globalSourceFilter, setGlobalSourceFilter] = useState<"all" | "manual" | "recurring">("all");
 
@@ -199,6 +200,14 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onO
     void load();
   }, [periodType, period, ticketId, globalMonthFilter, globalStatusFilter, globalSourceFilter]);
 
+  useEffect(() => {
+    if (periodType !== "all") {
+      return;
+    }
+
+    setGlobalMonthFilter(period !== "all" ? period : currentMonth());
+  }, [periodType, period, ticketId]);
+
   useEffect(() => {
     const nextInputs = Object.fromEntries((data?.dayBillings ?? []).map((billing) => [billing.day, formatHoursInput(billing.billed_minutes)]));
     setDayBillingInputs(nextInputs);
@@ -231,6 +240,8 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onO
       : `im Monat ${globalMonthFilter}`
     : `im ${periodLabel.toLowerCase()} ${period}`;
   const teamspaceLabel = isGlobalTicket || periodType === "month" ? "Teamspace gesamt" : "Teamspace Tag";
+  const availableMonths = data?.availableMonths ?? [];
+  const selectedMonthHasSessions = availableMonths.some((month) => month.month === globalMonthFilter);
   const dayBillingMap = useMemo(() => new Map((data?.dayBillings ?? []).map((billing) => [billing.day, billing.billed_minutes])), [data?.dayBillings]);
   const savedDayBillingInput = (day: string) => formatHoursInput(dayBillingMap.get(day));
   const isDayBillingDirty = (day: string) => (dayBillingInputs[day] ?? "") !== savedDayBillingInput(day);
@@ -282,16 +293,18 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onO
       return;
     }
 
+    const ticketMonth = isGlobalTicket ? globalMonthFilter : periodType === "day" ? period.slice(0, 7) : period;
+
     onOpenTicketChange?.({
-      key: isGlobalTicket ? `ticket:${ticket.id}` : `${periodType}:${period}:${ticket.id}`,
+      key: `ticket:${ticket.id}`,
       ticketId: ticket.id,
       ticketNumber: ticket.ticket_number,
-      periodType,
-      period,
-      path: isGlobalTicket ? `/tickets/${ticket.id}` : `/analysis/${periodType}/${period}/tickets/${ticket.id}`,
+      periodType: "all",
+      period: ticketMonth,
+      path: `/tickets/${ticket.id}?month=${ticketMonth}`,
       dirty: hasUnsavedChanges
     });
-  }, [ticket, periodType, period, isGlobalTicket, hasUnsavedChanges, onOpenTicketChange]);
+  }, [ticket, periodType, period, isGlobalTicket, globalMonthFilter, hasUnsavedChanges, onOpenTicketChange]);
 
   async function setBilling(sessionId: string, billingStatus: BillingStatus) {
     if (isPeriodClosed && billingStatus !== null) {
@@ -319,6 +332,13 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onO
       return;
     }
 
+    if (isPeriodClosed) {
+      toast.warning("Monat ist abgeschlossen", {
+        description: "Öffne den Monat zuerst wieder, um Teamspace-Zeiten zu ändern."
+      });
+      return;
+    }
+
     const parsedMinutes = parseHoursInput(dayBillingInputs[day] ?? "");
 
     if (parsedMinutes === undefined) {
@@ -542,7 +562,7 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onO
           <div className="flex flex-wrap items-center gap-2">
             <h2 className="text-xl font-semibold tracking-normal sm:text-2xl">{ticket?.ticket_number ?? "Ticket"}</h2>
             {ticket?.ticket_number ? <CopyTicketButton ticketNumber={ticket.ticket_number} /> : null}
-            {periodType === "month" && data?.closed ? <Badge variant="outline">Monat geschlossen</Badge> : null}
+            {(periodType === "month" || (isGlobalTicket && globalMonthFilter !== "all")) && data?.closed ? <Badge variant="outline">Monat geschlossen</Badge> : null}
           </div>
           <p className="text-sm text-muted-foreground">Sessions {sessionsScopeLabel}</p>
         </div>
@@ -574,7 +594,8 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onO
                 onChange={(event) => setGlobalMonthFilter(event.currentTarget.value)}
               >
                 <option value="all">Alle Monate</option>
-                {(data?.availableMonths ?? []).map((month) => (
+                {globalMonthFilter !== "all" && !selectedMonthHasSessions ? <option value={globalMonthFilter}>{globalMonthFilter} (0)</option> : null}
+                {availableMonths.map((month) => (
                   <option key={month.month} value={month.month}>
                     {month.month} ({month.session_count})
                   </option>
@@ -700,7 +721,7 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onO
                         autoComplete="off"
                         inputMode="decimal"
                         value={dayBillingInputs[group.key] ?? ""}
-                        disabled={savingDayBillingKey === group.key}
+                        disabled={isPeriodClosed || savingDayBillingKey === group.key}
                         placeholder="0"
                         onChange={(event) => {
                           const nextValue = event.currentTarget.value;
@@ -725,7 +746,7 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onO
                         type="button"
                         size="sm"
                         className={cn("h-7 w-[104px]", !isDayBillingDirty(group.key) && "invisible")}
-                        disabled={!isDayBillingDirty(group.key) || savingDayBillingKey === group.key}
+                        disabled={isPeriodClosed || !isDayBillingDirty(group.key) || savingDayBillingKey === group.key}
                         onMouseDown={(event) => event.preventDefault()}
                         onClick={() => void saveDayBilling(group.key)}
                       >