fix(i18n): restore tr locale key parity for gitView.empty discovery keys

The parity test fails on main: tr.ts is missing discoverFailed,
discoveringRepositories, retryDiscovery and selectRepositoryPlaceholder,
so 'all locales stay in key parity with english' is red on every run.
Carried in this PR to turn the checks green; drop it if you'd rather
land it separately.

packages/ui/src/lib/i18n/messages/tr.ts

@@ -796,6 +796,10 @@ export const dict = {
   'gitView.conflict.resolveNewSession': 'Yeni session\'da çöz',
   'gitView.empty.cleanDescription': 'Tüm değişiklikler commit edildi',
   'gitView.empty.cleanTitle': 'Working tree temiz',
+  'gitView.empty.discoveringRepositories': 'Git repository\'leri aranıyor...',
+  'gitView.empty.discoverFailed': 'Git repository\'leri taranamadı',
+  'gitView.empty.retryDiscovery': 'Tekrar dene',
+  'gitView.empty.selectRepositoryPlaceholder': 'Bir repository seçin...',
   'gitView.empty.pullBehindPlural': '{count} commit pull et',
   'gitView.empty.pullBehindSingle': '{count} commit pull et',
   'gitView.header.identityTooltip': 'Git kimliği',