feat: activity-based worklog suggestions (Step 16)

- Suggestion struct with nodeId, nodeTitle, summary, suggestedMin
- GetSuggestions binding: analyzes today's activity events, groups by
  node, skips nodes with existing today's worklog, generates summary
- AcceptSuggestion binding: creates worklog entry from suggestion
- HasTodayEntries helper on worklog.Service
- Suggestions panel in Worklog tab with Apply button
- i18n: worklog.suggestions / worklog.apply (ru + en)

frontend/src/lib/i18n/locales/en.js

@@ -120,4 +120,7 @@ export default {
 
   'error.generic': 'An error occurred',
   'error.invalidCredentials': 'Invalid username or password',
+
+  'worklog.suggestions': 'Suggestions for today',
+  'worklog.apply': 'Apply',
 }

frontend/src/lib/i18n/locales/ru.js

@@ -151,6 +151,8 @@ export default {
   'worklog.min': 'мин',
   'worklog.log': 'Записать',
   'worklog.empty': 'Записей работы пока нет',
+  'worklog.suggestions': 'Предложения на сегодня',
+  'worklog.apply': 'Применить',
 
   'sync.title': 'Синхронизация',
   'sync.settings': 'Настройки синхронизации',