refactor(requests): dedupe UpdateAutomationRuleRequest (#476)

## What

`UpdateAutomationRuleRequest` was **byte-identical** to
`StoreAutomationRuleRequest` (verified with `diff`): same `rules()`,
`passedValidation()`, `withValidator()`.

Now it simply extends the Store request.

## Stats

- **-74 / +1 lines**

## Checks

- `php artisan test --filter=AutomationRule` — 63 passed (211
assertions)
- `vendor/bin/pint --dirty` — applied

Part of duplication-removal series (#475 was first).

app/Http/Requests/Settings/UpdateAutomationRuleRequest.php

@@ -2,77 +2,4 @@
 
 namespace App\Http\Requests\Settings;
 
-use Illuminate\Contracts\Validation\ValidationRule;
-use Illuminate\Foundation\Http\FormRequest;
-use Illuminate\Validation\Rule;
-
-class UpdateAutomationRuleRequest extends FormRequest
-{
-    /**
-     * Determine if the user is authorized to make this request.
-     */
-    public function authorize(): bool
-    {
-        return true;
-    }
-
-    /**
-     * Get the validation rules that apply to the request.
-     *
-     * @return array<string, ValidationRule|array<mixed>|string>
-     */
-    public function rules(): array
-    {
-        return [
-            'title' => ['required', 'string', 'max:255'],
-            'priority' => ['required', 'integer', 'min:0'],
-            'rules_json' => ['required', 'json', function ($attribute, $value, $fail) {
-                $decoded = json_decode($value, true);
-                if (! is_array($decoded) || empty($decoded)) {
-                    $fail('The rules JSON must be a valid JsonLogic object.');
-                }
-            }],
-            'action_category_id' => [
-                'nullable',
-                'string',
-                Rule::exists('categories', 'id')->where(function ($query) {
-                    $query->where('user_id', auth()->id());
-                }),
-            ],
-            'action_note' => ['nullable', 'string'],
-            'action_note_iv' => ['nullable', 'string', 'required_with:action_note'],
-            'action_label_ids' => ['nullable', 'array'],
-            'action_label_ids.*' => [
-                'required',
-                'string',
-                'uuid',
-                Rule::exists('labels', 'id')->where(function ($query) {
-                    $query->where('user_id', auth()->id());
-                }),
-            ],
-        ];
-    }
-
-    /**
-     * Decode the rules_json string into an array so the model's array cast doesn't double-encode it.
-     */
-    protected function passedValidation(): void
-    {
-        $this->merge([
-            'rules_json' => json_decode($this->rules_json, true),
-        ]);
-    }
-
-    /**
-     * Configure the validator instance.
-     */
-    public function withValidator($validator): void
-    {
-        $validator->after(function ($validator) {
-            $hasLabels = ! empty($this->action_label_ids);
-            if (! $this->action_category_id && ! $hasLabels) {
-                $validator->errors()->add('action_category_id', 'At least one action (category or labels) must be provided.');
-            }
-        });
-    }
-}
+class UpdateAutomationRuleRequest extends StoreAutomationRuleRequest {}