feat(header): add GitHub star button to top bar

Compact pill (GitHub icon | star count) placed left of the version
display. Star count is fetched from the GitHub API once per 24h and
cached in localStorage; the button hides entirely when no count is
available (e.g. air-gapped deployments), matching the existing update-
check graceful-degradation pattern. Fetch is bounded by a 4s abort
timeout to avoid hanging requests offline.

src/locales/tr-TR/common.ts

@@ -167,6 +167,7 @@ export default {
   'common.time.hour': 'saat',
   'common.time.minute': 'dakika',
   'common.issue.report': 'Sorun bildir',
+  'common.github.star.tooltip': "GitHub'da bize yıldız verin",
   'common.social.discord': "Discord'umuza Katılın",
   'common.table.mark': 'Yorum',
   'common.table.rollback.mark': 'Geri Alma Yorumu',