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/activity/suggest.go

@@ -7,16 +7,29 @@ const (
 	ConfidenceHigh   = "high"
 )
 
+// SuggestionDetail is a lightweight event summary for suggestion display.
+type SuggestionDetail struct {
+	ID        string `json:"id"`
+	EventType string `json:"eventType"`
+	TargetType string `json:"targetType"`
+	TargetID  string `json:"targetId"`
+	Title     string `json:"title"`
+	CreatedAt string `json:"createdAt"`
+	NodeID    string `json:"nodeId"`
+}
+
 // Suggestion represents a suggested worklog entry derived from today's activity.
 type Suggestion struct {
-	NodeID           string `json:"nodeId"`
-	NodeTitle        string `json:"nodeTitle"`
-	Summary          string `json:"summary"`
-	SuggestedMin     int    `json:"suggestedMin"`
-	EventCount       int    `json:"eventCount"`
-	NodeKind         string `json:"nodeKind"`
-	Confidence       string `json:"confidence"`
-	ConfidenceReason string `json:"confidenceReason"`
-	Hidden           bool   `json:"hidden"`
-	TimeSpreadMin    int    `json:"timeSpreadMin"` // minutes between first and last event
+	NodeID           string            `json:"nodeId"`
+	NodeTitle        string            `json:"nodeTitle"`
+	Summary          string            `json:"summary"`
+	SuggestedMin     int               `json:"suggestedMin"`
+	EventCount       int               `json:"eventCount"`
+	NodeKind         string            `json:"nodeKind"`
+	Confidence       string            `json:"confidence"`
+	ConfidenceReason string            `json:"confidenceReason"`
+	Hidden           bool              `json:"hidden"`
+	TimeSpreadMin    int               `json:"timeSpreadMin"` // minutes between first and last event
+	EventIDs         []string          `json:"eventIds"`
+	Events           []SuggestionDetail `json:"events,omitempty"`
 }