feat: node search picker, ByNode grouping fix, PDF export

- node picker: Search/Path on Repository, SearchNodes binding,
  debounced search dropdown showing title + full path
- ByNode summary groups by nodeID with NodePath as label (not NodeTitle)
- PDF export for worklog reports with embedded DejaVuSans fonts
- ExportWorklogPDF binding + button on Journal screen
- Removed unused Section field from ReportFilter
- ListReport now calls BuildReportPaths so nodePath is available
- go.sum: +github.com/signintech/gopdf dependency

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

@@ -146,6 +146,7 @@ export default {
   'journal.byDay': 'By day',
   'journal.byNode': 'By case',
   'journal.includeChildren': 'Include subtasks',
+  'journal.nodeSearch': 'Search case...',
 
   'suggest.title': 'Suggestions',
   'suggest.apply': 'Log',

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

@@ -218,6 +218,7 @@ export default {
   'journal.byDay': 'По дням',
   'journal.byNode': 'По делам',
   'journal.includeChildren': 'С подзадачами',
+  'journal.nodeSearch': 'Поиск дела...',
 
   'suggest.title': 'Предложения на сегодня',
   'suggest.apply': 'Записать',