Fix unclaim permission bug - only show button for task owner

Previously, users could see and click "Unclaim" button for tasks claimed by others, leading to failed deletion attempts and temporary UI inconsistencies.

Changes:
- Add auth service injection to ScheduledEventCard
- Add canUnclaim computed property checking if current user created the current status
- Only show "Unclaim" button when canUnclaim is true (user owns the current status)
- Applies NIP-09 rule: users can only delete their own events

Behavior:
- Alice claims task → only Alice sees "Unclaim" button
- Bob marks task in-progress → only Bob sees "Unclaim" button
- Prevents failed deletion attempts and optimistic update bugs
- Follows Nostr protocol permissions correctly

This is a quick fix. Future enhancement will track per-user status for full collaborative workflow support.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/modules/nostr-feed/components/ScheduledEventCard.vue

@@ -17,6 +17,8 @@ import {
 } from '@/components/ui/collapsible'
 import { Calendar, MapPin, Clock, CheckCircle, PlayCircle, Hand } from 'lucide-vue-next'
 import type { ScheduledEvent, EventCompletion, TaskStatus } from '../services/ScheduledEventService'
+import { injectService, SERVICE_TOKENS } from '@/core/di-container'
+import type { AuthService } from '@/modules/base/auth/auth-service'
 
 interface Props {
   event: ScheduledEvent
@@ -39,6 +41,9 @@ const props = withDefaults(defineProps<Props>(), {
 
 const emit = defineEmits<Emits>()
 
+// Get auth service to check current user
+const authService = injectService<AuthService>(SERVICE_TOKENS.AUTH_SERVICE)
+
 // Confirmation dialog state
 const showConfirmDialog = ref(false)
 
@@ -66,6 +71,15 @@ const isCompletable = computed(() => props.event.eventType === 'task')
 // Get completion data
 const completion = computed(() => props.getCompletion(eventAddress.value, occurrence.value))
 
+// Get current user's pubkey
+const currentUserPubkey = computed(() => authService?.user.value?.pubkey)
+
+// Check if current user can unclaim (only if they created the current status)
+const canUnclaim = computed(() => {
+  if (!completion.value || !currentUserPubkey.value) return false
+  return completion.value.pubkey === currentUserPubkey.value
+})
+
 // Status badges configuration
 const statusConfig = computed(() => {
   switch (taskStatus.value) {
@@ -394,6 +408,7 @@ const dialogContent = computed(() => {
               Mark Complete
             </Button>
             <Button
+              v-if="canUnclaim"
               @click.stop="handleUnclaimTask"
               variant="outline"
               size="sm"
@@ -414,6 +429,7 @@ const dialogContent = computed(() => {
               Mark Complete
             </Button>
             <Button
+              v-if="canUnclaim"
               @click.stop="handleUnclaimTask"
               variant="outline"
               size="sm"
@@ -425,6 +441,7 @@ const dialogContent = computed(() => {
           <!-- Completed Task -->
           <template v-else-if="taskStatus === 'completed'">
             <Button
+              v-if="canUnclaim"
               @click.stop="handleUnclaimTask"
               variant="outline"
               size="sm"