fix: transaction-safe AcceptSuggestionWith + safe eventIds fallback + debug logging

Root cause: s.eventIds may be undefined in JavaScript even when s.events
has data (Wails v2 marshalling of []string in nested struct response).
On calling AcceptSuggestionWith(eventIDs []string), empty array reached Go,
no INSERTs executed, events silently lost.

Changes:
- Frontend: extractEventIds() fallback — s.eventIds || s.events[].id || []
- Frontend: console.log debug for eventIds/events in accept handler
- Backend: AcceptSuggestionWith wrapped in tx (Begin/Commit/Rollback) so
  entry creation + event linking is atomic
- Backend: AddWithSourceTx method for transaction-aware insert
- Backend: buildEntry helper extracted
- Backend: fmt.Printf debug logging for received eventIDs + link count
- Backend: verification query after commit
- Cleanup: removed stale frontend-dist assets, .gitignore build.log

internal/core/worklog/worklog.go

@@ -50,7 +50,7 @@ func (s *Service) Add(nodeID, summary, details string, minutes int, approximate,
 	return s.AddWithSource(nodeID, summary, details, date, minutes, approximate, billable, SourceManual)
 }
 
-// Add inserts a new worklog entry.
+// AddWithSource inserts a new worklog entry with an explicit source.
 func (s *Service) AddWithSource(nodeID, summary, details, date string, minutes int, approximate, billable bool, source string) (*Entry, error) {
 	if nodeID == "" {
 		return nil, fmt.Errorf("node_id required")
@@ -62,19 +62,7 @@ func (s *Service) AddWithSource(nodeID, summary, details, date string, minutes i
 		date = time.Now().Format("2006-01-02")
 	}
 
-	e := &Entry{
-		ID:          util.UUID7(),
-		NodeID:      nodeID,
-		Summary:     summary,
-		Details:     details,
-		Date:        date,
-		Minutes:     &minutes,
-		Approximate: approximate,
-		Billable:    billable,
-		Source:      source,
-		CreatedAt:   time.Now().UTC(),
-		UpdatedAt:   time.Now().UTC(),
-	}
+	e := buildEntry(nodeID, summary, details, date, minutes, approximate, billable, source)
 
 	_, err := s.db.Exec(
 		`INSERT INTO worklog_entries (id,node_id,date,minutes,approximate,billable,
@@ -90,6 +78,50 @@ func (s *Service) AddWithSource(nodeID, summary, details, date string, minutes i
 	return e, nil
 }
 
+// AddWithSourceTx inserts a new worklog entry within an existing transaction.
+func (s *Service) AddWithSourceTx(tx *sql.Tx, nodeID, summary, details, date string, minutes int, approximate, billable bool, source string) (*Entry, error) {
+	if nodeID == "" {
+		return nil, fmt.Errorf("node_id required")
+	}
+	if summary == "" {
+		return nil, fmt.Errorf("summary required")
+	}
+	if date == "" {
+		date = time.Now().Format("2006-01-02")
+	}
+
+	e := buildEntry(nodeID, summary, details, date, minutes, approximate, billable, source)
+
+	_, err := tx.Exec(
+		`INSERT INTO worklog_entries (id,node_id,date,minutes,approximate,billable,
+			summary,details,source,created_at,updated_at)
+		 VALUES (?,?,?,?,?,?,?,?,?,?,?)`,
+		e.ID, e.NodeID, e.Date, e.Minutes, boolInt(e.Approximate),
+		boolInt(e.Billable), e.Summary, e.Details, e.Source,
+		e.CreatedAt.Format(time.RFC3339), e.UpdatedAt.Format(time.RFC3339),
+	)
+	if err != nil {
+		return nil, err
+	}
+	return e, nil
+}
+
+func buildEntry(nodeID, summary, details, date string, minutes int, approximate, billable bool, source string) *Entry {
+	return &Entry{
+		ID:          util.UUID7(),
+		NodeID:      nodeID,
+		Summary:     summary,
+		Details:     details,
+		Date:        date,
+		Minutes:     &minutes,
+		Approximate: approximate,
+		Billable:    billable,
+		Source:      source,
+		CreatedAt:   time.Now().UTC(),
+		UpdatedAt:   time.Now().UTC(),
+	}
+}
+
 // Update modifies an existing entry.
 func (s *Service) Update(id, summary, details string, minutes int, approximate, billable bool) error {
 	t := time.Now().UTC().Format(time.RFC3339)