Added required for trend line analysis page

app/Filament/Pages/TrendLineAnalysis.php

@@ -62,6 +62,7 @@ class TrendLineAnalysis extends Page
                    ->options(Plant::pluck('name', 'id'))
                    ->label('Select Plant')
                    ->reactive()
+                   ->required()
                     ->afterStateUpdated(function ($state, callable $set) {
                         session(['selected_plant' => $state]);
                         // When plant changes, also reset meter_name
@@ -78,6 +79,7 @@ class TrendLineAnalysis extends Page
                 })
                 ->label('Select Meter')
                 ->reactive()
+                ->required()
                  ->afterStateUpdated(function ($state) {
                         session(['selected_meter' => $state]);
                 }),
@@ -92,6 +94,7 @@ class TrendLineAnalysis extends Page
                 ])
                 ->label('Select Parameter')
                 ->reactive()
+                ->required()
                 ->afterStateUpdated(function ($state) {
                         session(['parameter' => $state]);
                 }),