fix(i18n): fix language-independent synergy/build logic, add deploy on test-gay, and sticky nav tabs

- Fix Team Synergy calculation to use normalized canonical elements and paths across all 13 languages
- Fix showcase card, optimal relic builds, and LC dropdown path filters in non-English languages
- Add data-i18n and translations for quick commands and GM console greeting
- Update filter dropdown option text on language switch
- Add test-gay branch to GitHub Pages deployment workflow triggers
- Make nav-tabs sticky under header so menu navigation is always accessible while scrolling

css/styles.css

@@ -185,6 +185,9 @@ body {
 
 /* Navigation Tabs */
 .nav-tabs {
+  position: sticky;
+  top: 65px;
+  z-index: 45;
   display: flex;
   gap: 0.35rem;
   background: var(--bg-secondary);