Set tstamp on record inserts/updates

Questions, editor assignments and conditions were inserted without tstamp,
so Contao rendered them with tstamp=0 -> the backend "draft" styling
(opacity .5), making question rows look greyed out despite being published.

- SurveyQuestionRepository::insert()/update() (covers create, edit, duplicate)
- SurveyEditorRepository::insert()
- SurveyConditionRepository::insert()
SurveyRepository already set tstamp. Also widened the assigned-members
checkbox-wizard columns at smaller breakpoints.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

public/css/survey-backend.css

@@ -28,18 +28,18 @@ body.survey-question-list-page.survey-question-list-clipboard-active .parent_vie
 
 @media (max-width: 1400px) {
     .tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
-        column-count: 3;
+        column-count: 6;
     }
 }
 
 @media (max-width: 1100px) {
     .tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
-        column-count: 2;
+        column-count: 4;
     }
 }
 
 @media (max-width: 767px) {
     .tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
-        column-count: 1;
+        column-count: 2;
     }
 }

src/Repository/SurveyConditionRepository.php

@@ -62,6 +62,7 @@ final class SurveyConditionRepository
     {
         $this->connection->insert('tl_survey_condition', [
             'pid' => $surveyId,
+            'tstamp' => time(),
             'sourceQuestion' => (int) ($data['sourceQuestion'] ?? 0),
             'answerValue' => mb_strtolower(trim((string) ($data['answerValue'] ?? ''))),
             'targetQuestion' => (int) ($data['targetQuestion'] ?? 0),

src/Repository/SurveyEditorRepository.php

@@ -28,6 +28,7 @@ final class SurveyEditorRepository
 
         $this->connection->insert('tl_survey_editor', [
             'pid' => $surveyId,
+            'tstamp' => time(),
             'survey' => $surveyId,
             'member' => $memberId,
         ]);

src/Repository/SurveyQuestionRepository.php

@@ -64,6 +64,7 @@ final class SurveyQuestionRepository
 
         $this->connection->insert('tl_survey_content', [
             'pid' => $surveyId,
+            'tstamp' => time(),
             'sorting' => $sorting,
             'type' => $type,
             'question' => (string) ($data['question'] ?? ''),
@@ -100,6 +101,7 @@ final class SurveyQuestionRepository
         $isRangeType = 'range' === $type;
 
         $this->connection->update('tl_survey_content', [
+            'tstamp' => time(),
             'type' => $type,
             'question' => (string) ($data['question'] ?? $question->question),
             'description' => (string) ($data['description'] ?? $question->description),