feat: link dialog finds bullets of all notes; richer sample data with help notes, deep nesting and linked to-dos

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/storage/docsync_test.go

@@ -3,6 +3,7 @@ package storage
 import (
 	"errors"
 	"path/filepath"
+	"strings"
 	"testing"
 	"time"
 
@@ -398,13 +399,22 @@ func TestDemoAccountsGetSampleDataAndShares(t *testing.T) {
 		t.Fatalf("expected tasks and inbox thoughts, got %d tasks, %d inbox", tasks, inbox)
 	}
 	// Running it again (container restart) must not seed twice
+	var before, docs int
+	_ = s.db.QueryRow(`SELECT COUNT(*) FROM documents WHERE user_id = ?`, admin.ID).Scan(&before)
 	if err := s.EnsureDemoAccounts(); err != nil {
 		t.Fatal(err)
 	}
-	var docs int
 	_ = s.db.QueryRow(`SELECT COUNT(*) FROM documents WHERE user_id = ?`, admin.ID).Scan(&docs)
-	if docs != 4 {
-		t.Fatalf("restart seeded again: %d notes", docs)
+	if docs != before || docs < 10 {
+		t.Fatalf("restart seeded again or sample notes missing: %d notes before, %d after", before, docs)
+	}
+	// The linked example: a task tied to a note checkbox, with the checkboxes below as subtasks
+	var subtasks string
+	if err := s.db.QueryRow(`SELECT subtasks FROM thoughts WHERE user_id = ? AND converted_type = 'document_block' AND content LIKE 'Backup-Konzept%'`, admin.ID).Scan(&subtasks); err != nil {
+		t.Fatalf("linked sample task missing: %v", err)
+	}
+	if !strings.Contains(subtasks, "systemd-Timer") || !strings.Contains(subtasks, "blockId") {
+		t.Fatalf("checkboxes below should be linked subtasks: %s", subtasks)
 	}
 }