style: replace upload-style share icon with two-person users icon across all views

frontend/src/components/UnifiedShareModal.tsx

@@ -6,7 +6,6 @@ import {
   Plus,
   Trash2,
   Lock,
-  Share2,
   Check,
 } from 'lucide-react';
 import { User, Team, UnifiedShare } from '../lib/types';
@@ -114,7 +113,7 @@ export const UnifiedShareModal: React.FC<UnifiedShareModalProps> = ({
                   resourceIcon
                 )
               ) : (
-                <Share2 className="w-4 h-4" />
+                <Users className="w-4 h-4" />
               )}
             </div>
             <div className="min-w-0">

frontend/src/features/auth/SetupAndAuthView.tsx

@@ -7,7 +7,7 @@ import {
   UserPlus,
   LogIn,
   Server,
-  Share2,
+  Users,
   Check,
   AlertCircle,
 } from 'lucide-react';
@@ -235,7 +235,7 @@ export const SetupAndAuthView: React.FC<SetupAndAuthViewProps> = ({
 
               <div>
                 <label className="block text-muted mb-1.5 flex items-center gap-1">
-                  <Share2 className="w-3 h-3 text-accent" />
+                  <Users className="w-3 h-3 text-accent" />
                   <span>Sichtbarkeit & Sharing-Isolation zwischen Benutzern</span>
                 </label>
                 <div className="grid grid-cols-1 sm:grid-cols-3 gap-2">

frontend/src/features/help/HelpView.tsx

@@ -234,7 +234,7 @@ export const HelpView: React.FC<HelpViewProps> = () => {
             <div className="grid grid-cols-1 md:grid-cols-2 gap-3 text-xs">
               <div className="p-3 bg-canvas border border-border rounded-card space-y-2">
                 <h3 className="font-semibold text-main flex items-center gap-1.5">
-                  <Share2 className="w-3.5 h-3.5 text-accent" />
+                  <Users className="w-3.5 h-3.5 text-accent" />
                   <span>Aufgabenlisten teilen & Avatar-Stack</span>
                 </h3>
                 <p className="text-muted leading-relaxed">

frontend/src/features/lists/SharedListsView.tsx

@@ -6,7 +6,6 @@ import {
   Check,
   Radio,
   Sparkles,
-  Share,
   X,
   Hash,
 } from 'lucide-react';
@@ -799,7 +798,7 @@ export const SharedListsView: React.FC<SharedListsViewProps> = ({ onRefreshGloba
                   className="btn-icon"
                   title="Liste teilen und Berechtigungen"
                 >
-                  <Share className="w-3.5 h-3.5" />
+                  <Users className="w-3.5 h-3.5" />
                 </button>
               </div>
             );

frontend/src/features/settings/AdminSettingsView.tsx

@@ -13,7 +13,6 @@ import {
   Send,
   AlertCircle,
   UserPlus,
-  Share2,
 } from 'lucide-react';
 import {
   SystemSettings,
@@ -690,7 +689,7 @@ export const AdminSettingsView: React.FC<AdminSettingsViewProps> = ({
                 {/* Sharing Isolation Cards */}
                 <div className="space-y-2">
                   <label className="block text-muted font-semibold flex items-center gap-1.5">
-                    <Share2 className="w-4 h-4 text-accent" />
+                    <Users className="w-4 h-4 text-accent" />
                     <span>Globale Sharing- & Sichtbarkeits-Isolation</span>
                   </label>
 

frontend/src/features/triage/TasksView.tsx

@@ -13,8 +13,6 @@ import {
   Edit3,
   X,
   Layers,
-  Share,
-  Share2,
   Users,
   CheckSquare,
   User as UserIcon,
@@ -1165,7 +1163,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
                   className="btn-icon"
                   title="Aufgabenliste teilen und Berechtigungen"
                 >
-                  <Share className="w-3.5 h-3.5" />
+                  <Users className="w-3.5 h-3.5" />
                 </button>
               </div>
             );

frontend/src/features/workspace/WorkspaceView.tsx

@@ -45,8 +45,6 @@ import {
   Unlock,
   Eye,
   Edit3,
-  Share,
-  Share2,
   Hash,
   User as UserIcon,
 } from 'lucide-react';
@@ -3358,7 +3356,7 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
                       className="btn-icon"
                       title="Notiz teilen und Berechtigungen"
                     >
-                      <Share className="w-3.5 h-3.5" />
+                      <Users className="w-3.5 h-3.5" />
                     </button>
 
                     <button