feat: activity assignment + team view for owner/admin

db: activities.assigneeId column (string, optional)

activity-actions: assigneeId saved on create (default: self), cleared on update
validation: assigneeId added to activitySchema
schema: assigneeId field on Activity type

activity-form-sheet: Atanan Kişi dropdown for owner/admin with member list
activity-team-view: new component — activities grouped by assignee,
  completion/edit/delete actions, overdue indicator, member avatars
activities-client: Ekip tab (owner/admin only), members + currentUserId props
activities page: fetches team memberships + user details, passes to client
activity-email-actions: filter by assigneeId ?? createdBy for both me/team modes

src/components/activities/activities-client.tsx

@@ -2,7 +2,7 @@
 
 import { useState, useEffect } from "react";
 import { useRouter } from "next/navigation";
-import { DotsThree, Plus, PencilSimple, Trash, CheckCircle, List, CalendarDots } from '@/lib/icons';
+import { DotsThree, Plus, PencilSimple, Trash, CheckCircle, List, CalendarDots, Users } from '@/lib/icons';
 import { toast } from "sonner";
 
 import { Button } from "@/components/ui/button";
@@ -19,19 +19,23 @@ import {
 } from "@/lib/appwrite/activity-actions";
 import { ActivityFormSheet } from "./activity-form-sheet";
 import { ActivityCalendar } from "./activity-calendar";
+import { ActivityTeamView } from "./activity-team-view";
 import { SendSummaryDialog } from "./send-summary-dialog";
 import { DeleteConfirmDialog } from "@/components/ui/delete-confirm-dialog";
 import type { Activity, Customer, Property } from "@/lib/appwrite/schema";
 import { ACTIVITY_TYPE_LABELS } from "@/lib/appwrite/schema";
 import type { TenantRole } from "@/lib/appwrite/tenant-guard";
+import type { TeamMember } from "./activity-form-sheet";
 
-type ViewMode = "list" | "calendar";
+type ViewMode = "list" | "calendar" | "team";
 
 interface ActivitiesClientProps {
   initialActivities: Activity[];
   customers: Customer[];
   properties: Property[];
   role: TenantRole;
+  members: TeamMember[];
+  currentUserId: string;
 }
 
 export function ActivitiesClient({
@@ -39,6 +43,8 @@ export function ActivitiesClient({
   customers,
   properties,
   role,
+  members,
+  currentUserId,
 }: ActivitiesClientProps) {
   const router = useRouter();
   const [activities, setActivities] = useState(initialActivities);
@@ -126,6 +132,20 @@ export function ActivitiesClient({
               <CalendarDots className="size-3.5" />
               Takvim
             </button>
+            {(role === "owner" || role === "admin") && (
+              <button
+                type="button"
+                onClick={() => setViewMode("team")}
+                className={`flex items-center gap-1.5 px-3 py-1.5 text-xs font-medium transition-colors ${
+                  viewMode === "team"
+                    ? "bg-primary text-primary-foreground"
+                    : "bg-background text-muted-foreground hover:text-foreground"
+                }`}
+              >
+                <Users className="size-3.5" />
+                Ekip
+              </button>
+            )}
           </div>
           <SendSummaryDialog role={role} />
           <Button onClick={openCreate} size="sm" data-tour="activities-add">
@@ -146,6 +166,18 @@ export function ActivitiesClient({
         />
       )}
 
+      {/* Team view — owner/admin only */}
+      {viewMode === "team" && (
+        <ActivityTeamView
+          activities={activities}
+          members={members}
+          currentUserId={currentUserId}
+          onEdit={openEdit}
+          onComplete={handleComplete}
+          onDelete={setDeleteTarget}
+        />
+      )}
+
       {/* List view */}
       {viewMode === "list" && (
       <div data-tour="activities-table" className="rounded-md border">
@@ -230,6 +262,9 @@ export function ActivitiesClient({
         activity={editing}
         customers={customers}
         properties={properties}
+        members={members}
+        role={role}
+        currentUserId={currentUserId}
         onSuccess={() => router.refresh()}
       />
       <DeleteConfirmDialog