feat: journal UX overhaul — picker, export dialog, events, readability

- Sidebar i18n: added missing nav.journal to backend ru.json
- Export: SaveWorklogReport binding with native SaveFileDialog + os.WriteFile
- Filter: better IncludeChildren label with disabled tooltip
- Filter: renamed billable→К оплате, approximate→Тип времени with hints
- worklog_entry_events table (migration 013) linking entries to activity events
- Suggestion: EventIDs + Events details, expandable cards with timestamps
- Journal rows: expandable with details, source, linked events
- Contrast: improved readability for dates, timestamps, hover states
- i18n: added worklog.*, journal.*, suggest.* keys to ru.js/en.js

internal/core/storage/migrations_013.sql.go

@@ -0,0 +1,12 @@
+package storage
+
+// migration013 — worklog_entry_events table linking entries to activity events.
+const migration013 = `
+CREATE TABLE IF NOT EXISTS worklog_entry_events (
+    entry_id TEXT NOT NULL REFERENCES worklog_entries(id) ON DELETE CASCADE,
+    event_id TEXT NOT NULL,
+    PRIMARY KEY (entry_id, event_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_wle_events ON worklog_entry_events(event_id);
+`

internal/core/storage/storage.go

@@ -69,6 +69,7 @@ var migrationFiles = map[int]string{
 	10: migration010,
 	11: migration011,
 	12: migration012,
+	13: migration013,
 }
 
 func (db *DB) runInitialSchema() error {