v2.0.2 — English tag aliases, English-only website, undo-body flaky fix

- tags: accept #birthday and #appointment as English synonyms for
  #geburtstag and #termin. Normalised to the German canonical form at
  extractTags() write-time so every downstream check (parseTags /
  calendar logic / board filters) keeps working without per-call-site
  aliasing. Editor body-regex extended so the "new appointment"
  heuristic and auto-sync trigger on either variant.
- website: replace #termin/#geburtstag with #appointment/#birthday in
  tag chips, calendar feature list, and calendar legend.
- tests: fix flaky "Undo: Editor Save → Ctrl+Z reverts body change"
  that raced doSave(). The test polled the server for the patched body
  and fired Ctrl+Z as soon as it landed, but the undo shortcut is
  guarded by !guards.isOpen('modal'), and closeModal() only runs after
  the post-patch _reloadAll — on fast servers the key was swallowed.
  Poll now also waits for the modal `.open` class to drop.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/index.php

@@ -273,7 +273,14 @@ if (str_starts_with($route, '/api/')) {
     function validInt($v, $default = 0) { return is_numeric($v) ? (int)$v : $default; }
     function extractTags($body) {
         preg_match_all('/(?<=\s|^)#([a-zA-Z0-9_\/-][a-zA-Z0-9_\/-]*[a-zA-Z0-9_-]|[a-zA-Z0-9_-]+)/m', $body ?? '', $matches);
-        return implode(',', array_unique(array_map('strtolower', $matches[1] ?? [])));
+        // English ↔ German tag aliases: the calendar + journal logic is
+        // hardcoded against 'geburtstag' / 'termin', so accept the English
+        // synonyms and normalise to the canonical German form at write
+        // time. Keeps every downstream check (card.tags includes 'geburtstag')
+        // working without touching dozens of JS call sites.
+        $aliases = ['birthday' => 'geburtstag', 'appointment' => 'termin'];
+        $tags = array_map(fn($t) => $aliases[$t] ?? $t, array_map('strtolower', $matches[1] ?? []));
+        return implode(',', array_unique($tags));
     }
 
     // Plugin route handlers (registered by plugin backend.php files).