feat: scheduled report digests + per-session capacity (M33)

POST /v1/internal/jobs/reports/dispatch emails each tenant owner a
trailing-window digest (bookings, revenue, per-service and per-staff
breakdown) localized to the tenant locale; zero-activity tenants are
skipped. Metrics cores extracted to tenant-scoped variants so the job
needs no principal.

PATCH /v1/catalog/class-sessions/:id sets a session's seat count with
a confirmed-bookings floor — shrinking below it needs allowOverCapacity,
matching the waitlist-promotion convention. Session rows gain an inline
capacity editor with an overbook confirm state.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/frontend/src/providers/i18n-provider.tsx

@@ -457,6 +457,9 @@ const dictionaries = {
     "dashboard.class.applyToFutureHint": "Přesune již vytvořené lekce na nový čas a místo, rezervace se přesunou s nimi.",
     "dashboard.class.ruleActive": "Pravidlo je aktivní",
     "dashboard.class.inactive": "neaktivní",
+    "dashboard.class.editCapacity": "Upravit kapacitu",
+    "dashboard.class.capacityLabel": "Kapacita",
+    "dashboard.class.capacityOverbookHint": "Kapacita je nižší než počet potvrzených míst — uložením se lekce přebookuje.",
     "dashboard.class.dow.0": "Neděle",
     "dashboard.class.dow.1": "Pondělí",
     "dashboard.class.dow.2": "Úterý",
@@ -1093,6 +1096,9 @@ const dictionaries = {
     "dashboard.class.applyToFutureHint": "Moves already-created sessions to the new time and location; bookings move with them.",
     "dashboard.class.ruleActive": "Rule is active",
     "dashboard.class.inactive": "inactive",
+    "dashboard.class.editCapacity": "Edit capacity",
+    "dashboard.class.capacityLabel": "Capacity",
+    "dashboard.class.capacityOverbookHint": "Capacity is below the confirmed seat count — saving overbooks the session.",
     "dashboard.class.dow.0": "Sunday",
     "dashboard.class.dow.1": "Monday",
     "dashboard.class.dow.2": "Tuesday",

apps/frontend/src/routes/dashboard/zones-page.tsx

@@ -42,6 +42,12 @@ function ZonesPage() {
   const [editSchedApplyFuture, setEditSchedApplyFuture] = createSignal(true);
   const [editSchedActive, setEditSchedActive] = createSignal(true);
   const [schedEditSaving, setSchedEditSaving] = createSignal(false);
+  const [editingCapSessionId, setEditingCapSessionId] = createSignal<string | null>(null);
+  const [editCapValue, setEditCapValue] = createSignal(0);
+  const [capSaving, setCapSaving] = createSignal(false);
+  // Session ID whose capacity shrink hit the confirmed-seat floor — the row
+  // switches to an explicit "set anyway" confirm before resubmitting.
+  const [capOverbookConfirm, setCapOverbookConfirm] = createSignal<string | null>(null);
   const [expandedSessionId, setExpandedSessionId] = createSignal<string | null>(null);
   const [promoteBusy, setPromoteBusy] = createSignal<string | null>(null);
   // Booking IDs whose promote attempt hit a full session — awaiting the
@@ -448,6 +454,35 @@ function ZonesPage() {
     }
   };
 
+  const startEditCapacity = (session: any) => {
+    setEditingCapSessionId(session.id);
+    setEditCapValue(session.capacity);
+    setCapOverbookConfirm(null);
+  };
+
+  const handleSaveCapacity = async (session: any, allowOverCapacity: boolean) => {
+    const bearer = data.token();
+    if (!bearer || bearer.startsWith("demo.")) { data.setDemoNotice(cs() ? "V demo režimu nelze ukládat." : "Cannot save in demo mode."); return; }
+    setCapSaving(true);
+    try {
+      const response = await (apiClient as any).PATCH(`/v1/catalog/class-sessions/${session.id}`, {
+        ...authHeaders(),
+        body: { capacity: editCapValue(), allowOverCapacity },
+      });
+      if (response.response?.status === 409 && !allowOverCapacity) {
+        setCapOverbookConfirm(session.id);
+        return;
+      }
+      setEditingCapSessionId(null);
+      setCapOverbookConfirm(null);
+      void refetchSessions();
+    } catch {
+      data.setDemoNotice(cs() ? "Uložení selhalo." : "Save failed.");
+    } finally {
+      setCapSaving(false);
+    }
+  };
+
   const handleDeleteSchedule = async (id: string) => {
     const bearer = data.token();
     if (!bearer || bearer.startsWith("demo.")) { data.setDemoNotice(cs() ? "V demo režimu nelze mazat." : "Cannot delete in demo mode."); return; }
@@ -891,9 +926,26 @@ function ZonesPage() {
                               {expanded() ? data.i18n.t("dashboard.class.hideRoster") : data.i18n.t("dashboard.class.showRoster")}
                               <span class={`inline-flex transition-transform duration-200 ${expanded() ? "rotate-180" : ""}`}><ChevronDownIcon /></span>
                             </button>
+                            <button onClick={() => startEditCapacity(session)} class="p-2 text-ink-subtle hover:text-accent hover:bg-accent-subtle/40 rounded-lg transition-colors" aria-label={data.i18n.t("dashboard.class.editCapacity")}><PencilIcon /></button>
                             <button onClick={() => void handleDeleteSession(session.id)} class="p-2 text-ink-subtle hover:text-red-600 hover:bg-red-50 rounded-lg transition-colors" aria-label={cs() ? "Smazat" : "Delete"}><Trash2Icon /></button>
                           </div>
                         </div>
+                        <Show when={editingCapSessionId() === session.id}>
+                          <div class="px-6 pb-4 animate-fade-in">
+                            <div class="flex flex-wrap items-end gap-3 rounded-xl border border-border/60 bg-canvas-subtle/30 p-4">
+                              <Input type="number" label={data.i18n.t("dashboard.class.capacityLabel")} value={String(editCapValue())} min={1} onInput={(e) => setEditCapValue(parseInt(e.currentTarget.value, 10) || 0)} />
+                              <button onClick={() => void handleSaveCapacity(session, capOverbookConfirm() === session.id)} disabled={capSaving() || editCapValue() < 1} class="btn-primary text-sm disabled:opacity-60">
+                                <CheckIcon /> {capSaving() ? data.i18n.t("dashboard.saving") : data.i18n.t("dashboard.saveChanges")}
+                              </button>
+                              <button onClick={() => { setEditingCapSessionId(null); setCapOverbookConfirm(null); }} class="btn-secondary text-sm">
+                                <XIcon /> {data.i18n.t("dashboard.cancel")}
+                              </button>
+                              <Show when={capOverbookConfirm() === session.id}>
+                                <p class="w-full text-sm text-warning font-medium">{data.i18n.t("dashboard.class.capacityOverbookHint")}</p>
+                              </Show>
+                            </div>
+                          </div>
+                        </Show>
                         <Show when={expanded()}>
                           <div class="px-6 pb-5 animate-fade-in">
                             <div class="rounded-xl border border-border/60 bg-canvas-subtle/30 overflow-hidden">