fix(004): Apply 7-day policy filter to backup policy selector

Prevents selection of policies that haven't been synced in the last 7 days
(likely deleted in Intune). Aligns with PolicyResource table filter.

This is a workaround until Feature 005 (Policy Lifecycle) is implemented
with proper soft delete detection during sync.

app/Filament/Resources/BackupSetResource/RelationManagers/BackupItemsRelationManager.php

@@ -46,6 +46,25 @@ public function table(Table $table): Table
                     ->label('Policy ID')
                     ->copyable(),
                 Tables\Columns\TextColumn::make('platform')->badge(),
+                Tables\Columns\TextColumn::make('metadata.assignment_count')
+                    ->label('Assignments')
+                    ->default('0')
+                    ->badge()
+                    ->color('info'),
+                Tables\Columns\TextColumn::make('metadata.scope_tag_names')
+                    ->label('Scope Tags')
+                    ->badge()
+                    ->separator(',')
+                    ->default('—')
+                    ->formatStateUsing(function ($state) {
+                        if (empty($state)) {
+                            return '—';
+                        }
+                        if (is_array($state)) {
+                            return implode(', ', $state);
+                        }
+                        return $state;
+                    }),
                 Tables\Columns\TextColumn::make('captured_at')->dateTime(),
                 Tables\Columns\TextColumn::make('created_at')->since(),
             ])
@@ -70,6 +89,7 @@ public function table(Table $table): Table
 
                                 return Policy::query()
                                     ->where('tenant_id', $tenantId)
+                                    ->where('last_synced_at', '>', now()->subDays(7)) // Hide deleted policies (Feature 005 workaround)
                                     ->when($existing, fn (Builder $query) => $query->whereNotIn('id', $existing))
                                     ->orderBy('display_name')
                                     ->pluck('display_name', 'id');