Summer cleanup: XLSX export, WIDM-style quiz UI, CSS fixes (#162)

* Add CLAUDE.md, replace Makefile with Justfile, remove .junie

- Add CLAUDE.md with project overview, commands, architecture, and domain entity docs
- Remove Makefile in favour of the existing Justfile
- Remove .junie/AGENTS.md (knowledge transferred to CLAUDE.md)
- Update .gitignore: drop .junie/ entries, add .claude/settings.local.json
- Minor doc fixes in config/reference.php (typo, type correction)

* Clean up templates and CSS

- season.html.twig: remove dead empty column, drop redundant flex-row
- tab_overview.html.twig: extract Twig macro for confirm modals, fix duplicate aria-labelledby IDs
- tab_result.html.twig: remove dead comment, replace inline widths with CSS classes, simplify nested row/col forms to d-flex gap-1
- backoffice.scss: add col-result-xs/sm/md column width classes
- quiz.scss: replace broken display:grid + justify-self:center with flexbox centering

* Implement quizToXlsx() export and add export button

- QuizSpreadsheetService: implement quizToXlsx() as the inverse of
  fillQuizFromArray() — writes quiz questions and answers to XLSX using
  the same column layout as the import template
- BackofficeController: add exportQuiz() action at GET /backoffice/quiz/{quiz}/export
- tab_overview.html.twig: add Export to XLSX button in Quick actions

* Add unit tests for QuizSpreadsheetService

7 tests covering generateTemplate(), quizToXlsx(), and xlsxToQuiz():
- valid XLSX output and MIME type
- template without example reimports as empty
- template example data survives a reimport
- round-trip (export → reimport) preserves questions, answers, and correct flags
- empty quiz exports and reimports cleanly
- invalid MIME type throws InvalidArgumentException
- question with no answers throws SpreadsheetDataException with error list

* Fix quiz page vertical centering regression

The CSS cleanup broke vertical centering: flex on body causes main to
stretch full-width; place-items:center on a grid body only centers
items within their auto-sized track (not the track within body).

Fix: move background/color to html (full-viewport grid that centers
body), give body height:100% + display:grid + align-content:center
(centers the content track within full-height body) + justify-self:center
(shrink-wraps body width). Matches production behavior exactly.

* Improve quiz page layouts: WIDM-style answers and responsive centering

- Add green square answer buttons styled after the TV show
- Two-column answer grid for 6+ answers, single column on mobile
- fit-content centering for question pages so block matches question width
- Narrow fixed-width centering for form pages (enter name, select season)

* Use HeaderUtils::makeDisposition() for safe Content-Disposition filename

* Fix quizToXlsx to support unlimited answers and add header count tests

- Replace hardcoded 6-column arrays with dynamic Coordinate arithmetic
- Write data rows first to determine max answer count, write headers last
- Replace try/catch ErrorException in fillQuizFromArray with array_key_exists
- Add data-provider test covering 2, 6, 7, and 10 answers
- Add cross-question max-header and 7-answer round-trip tests

* Fix Sass healthcheck

* Improve quiz layout: add fixed topbar, include navigation, and clean up unused elements

- Add `.quiz-topbar` with fixed positioning and spacing in `quiz.scss`
- Update `base.html.twig` to include `quiz/nav.html.twig` in a new `nav` block
- Remove unused "Manage Quiz" button from `select_season.html.twig`

* Refactor generateTemplate to reuse quizToXlsx and add second example question

- generateTemplate now builds an in-memory Quiz entity and delegates to
  quizToXlsx, eliminating duplicate spreadsheet-building logic
- Adds a second example question "Wie is de mol?" with 10 Dutch names
  (5 male, 5 female) to better illustrate the import format
- Updates tests to assert both example questions and adds a test for the
  blank-row halt behaviour in fillQuizFromArray (achieving 100% coverage)

* Move PHPUnit cache to /tmp to avoid writing into the mounted volume

* Update src/Service/QuizSpreadsheetService.php

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

phpunit.dist.xml

@@ -8,7 +8,7 @@
          failOnNotice="true"
          failOnWarning="true"
          bootstrap="tests/bootstrap.php"
-         cacheDirectory=".phpunit.cache"
+         cacheDirectory="/tmp/phpunit.cache"
 >
     <php>
         <ini name="display_errors" value="1" />

src/Service/QuizSpreadsheetService.php

@@ -18,39 +18,40 @@ class QuizSpreadsheetService
 {
     public function generateTemplate(bool $fillExample = true): \Closure
     {
-        $spreadsheet = new Spreadsheet();
-
-        $sheet = $spreadsheet->getActiveSheet();
-
-        $sheet->getStyle('1:1')->getFont()->setBold(true);
-
-        $sheet->setCellValue('A1', 'Question');
-        $sheet->getColumnDimension('A')->setWidth(30);
-        $sheet->getStyle('A:A')->getAlignment()->setWrapText(true);
-
-        $counter = 1;
-        foreach (range('B', 'L', 2) as $column) {
-            $sheet->setCellValue($column.'1', 'Answer '.$counter++);
-            $sheet->getColumnDimension($column)->setWidth(30);
-            $sheet->getStyle($column.':'.$column)->getAlignment()->setWrapText(true);
-        }
-
-        foreach (range('C', 'M', 2) as $column) {
-            $sheet->setCellValue($column.'1', 'Correct');
-            $sheet->getColumnDimension($column)->setAutoSize(true);
-        }
+        $quiz = new Quiz();
 
         if ($fillExample) {
-            $sheet->setCellValue('B2', 'Man');
-            $sheet->setCellValue('C2', true);
+            $geslacht = new Question();
+            $geslacht->question = 'Is de mol een man of een vrouw?';
+            $geslacht->ordering = 1;
+            $geslacht->addAnswer(new Answer('Man', true));
+            $geslacht->addAnswer(new Answer('Vrouw'));
+            $quiz->addQuestion($geslacht);
 
-            $sheet->setCellValue('D2', 'Vrouw');
-            $sheet->setCellValue('E2', false);
-
-            $sheet->setCellValue('A2', 'Is de mol een man of een vrouw?');
+            $identiteit = new Question();
+            $identiteit->question = 'Wie is de mol?';
+            $identiteit->ordering = 2;
+            foreach ([
+                ['Emma', false],
+                ['Jan', false],
+                ['Sara', false],
+                ['Piet', false],
+                ['Lisa', true],
+                ['Kees', false],
+                ['Anna', false],
+                ['Henk', false],
+                ['Nina', false],
+                ['Joost', false],
+            ] as $i => [$name, $correct]) {
+                $answer = new Answer($name, $correct);
+                $answer->ordering = $i + 1;
+                $identiteit->addAnswer($answer);
             }
 
-        return $this->toXlsx($spreadsheet);
+            $quiz->addQuestion($identiteit);
+        }
+
+        return $this->quizToXlsx($quiz);
     }
 
     /** @throws SpreadsheetDataException */
@@ -102,7 +103,7 @@ class QuizSpreadsheetService
             }
 
             if (1 === $answerCounter) {
-                $errors[] = \sprintf('Question %d has no answers', $answerCounter);
+                $errors[] = \sprintf('Question %d has no answers', $question->ordering);
             }
 
             $quiz->addQuestion($question);

tests/Service/QuizSpreadsheetServiceTest.php

@@ -5,6 +5,8 @@ declare(strict_types=1);
 namespace Tvdt\Tests\Service;
 
 use PhpOffice\PhpSpreadsheet\Reader;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Writer;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
@@ -69,12 +71,17 @@ final class QuizSpreadsheetServiceTest extends TestCase
         $quiz = new Quiz();
         $this->subject->xlsxToQuiz($quiz, new File($path));
 
-        $this->assertCount(1, $quiz->questions);
+        $this->assertCount(2, $quiz->questions);
 
-        /** @var Question $question */
-        $question = $quiz->questions->first();
-        $this->assertSame('Is de mol een man of een vrouw?', $question->question);
-        $this->assertCount(2, $question->answers);
+        /** @var Question $first */
+        $first = $quiz->questions->first();
+        $this->assertSame('Is de mol een man of een vrouw?', $first->question);
+        $this->assertCount(2, $first->answers);
+
+        /** @var Question $second */
+        $second = $quiz->questions->last();
+        $this->assertSame('Wie is de mol?', $second->question);
+        $this->assertCount(10, $second->answers);
     }
 
     public function testQuizToXlsxEmptyQuizImportsWithNoQuestions(): void
@@ -142,17 +149,44 @@ final class QuizSpreadsheetServiceTest extends TestCase
         }
     }
 
-    /** @return array<string, array{int, string, int, string, int, int}> */
-    public static function answerCountHeaderProvider(): array
+    public function testXlsxToQuizStopsAtBlankRow(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->setCellValue('A1', 'Question');
+        $sheet->setCellValue('B1', 'Answer 1');
+        $sheet->setCellValue('C1', 'Correct');
+        $sheet->setCellValue('A2', 'First question');
+        $sheet->setCellValue('B2', 'Yes');
+        $sheet->setCellValue('C2', true);
+        // Row 3 intentionally blank — should halt parsing
+        $sheet->setCellValue('A4', 'Second question');
+        $sheet->setCellValue('B4', 'No');
+        $sheet->setCellValue('C4', false);
+
+        $path = $this->createTempPath('.xlsx');
+        ob_start();
+        new Writer\Xlsx($spreadsheet)->save('php://output');
+        file_put_contents($path, ob_get_clean());
+
+        $quiz = new Quiz();
+        $this->subject->xlsxToQuiz($quiz, new File($path));
+
+        $this->assertCount(1, $quiz->questions);
+        /** @var Question $first */
+        $first = $quiz->questions->first();
+        $this->assertSame('First question', $first->question);
+    }
+
+    /** @return \Iterator<string, array{int, string, int, string, int, int}> */
+    public static function answerCountHeaderProvider(): \Iterator
     {
         // Columns (0-based): Question=0, Answer1=1, Correct=2, Answer2=3, Correct=4, …
         // Answer N is at index 1+2*(N-1) = 2N-1, Correct N at 2+2*(N-1) = 2N.
-        return [
-            '2 answers → 2 header pairs' => [2,  'Answer 2',  3,  'Correct', 4,  5],
-            '6 answers → 6 header pairs' => [6,  'Answer 6',  11, 'Correct', 12, 13],
-            '7 answers → 7 header pairs' => [7,  'Answer 7',  13, 'Correct', 14, 15],
-            '10 answers → 10 header pairs' => [10, 'Answer 10', 19, 'Correct', 20, 21],
-        ];
+        yield '2 answers → 2 header pairs' => [2,  'Answer 2',  3,  'Correct', 4,  5];
+        yield '6 answers → 6 header pairs' => [6,  'Answer 6',  11, 'Correct', 12, 13];
+        yield '7 answers → 7 header pairs' => [7,  'Answer 7',  13, 'Correct', 14, 15];
+        yield '10 answers → 10 header pairs' => [10, 'Answer 10', 19, 'Correct', 20, 21];
     }
 
     #[DataProvider('answerCountHeaderProvider')]
@@ -228,7 +262,7 @@ final class QuizSpreadsheetServiceTest extends TestCase
     {
         $quiz = new Quiz();
         foreach ($counts as $i => $count) {
-            $quiz->addQuestion($this->makeQuestion("Question $i", $count));
+            $quiz->addQuestion($this->makeQuestion('Question '.$i, $count));
         }
 
         return $quiz;
@@ -240,7 +274,7 @@ final class QuizSpreadsheetServiceTest extends TestCase
         $question->question = $text;
         $question->ordering = 1;
         for ($i = 1; $i <= $answerCount; ++$i) {
-            $question->addAnswer(new Answer("Answer $i", isRightAnswer: false));
+            $question->addAnswer(new Answer('Answer '.$i, isRightAnswer: false));
         }
 
         return $question;
@@ -249,7 +283,7 @@ final class QuizSpreadsheetServiceTest extends TestCase
     /** @return array<int, string|null> */
     private function readFirstRow(string $path): array
     {
-        $rows = (new Reader\Xlsx())->setReadDataOnly(true)->load($path)->getActiveSheet()->toArray(formatData: false);
+        $rows = new Reader\Xlsx()->setReadDataOnly(true)->load($path)->getActiveSheet()->toArray(formatData: false);
 
         return $rows[0] ?? [];
     }