chore: auto-commit (57 archivos)

- frontend/functions/core/format_datetime_short.md
- frontend/functions/core/format_datetime_short.test.ts
- frontend/functions/core/format_datetime_short.ts
- frontend/functions/core/format_duration.md
- frontend/functions/core/format_duration.test.ts
- frontend/functions/core/format_duration.ts
- frontend/functions/core/month_grid.md
- frontend/functions/core/month_grid.test.ts
- frontend/functions/core/month_grid.ts
- frontend/functions/core/string_hash_palette.md
- ...

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

functions/infra/sqlite_column_exists_test.go

@@ -0,0 +1,59 @@
+package infra
+
+import (
+	"database/sql"
+	"testing"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+func openMemDB(t *testing.T) *sql.DB {
+	t.Helper()
+	db, err := sql.Open("sqlite3", ":memory:")
+	if err != nil {
+		t.Fatalf("open :memory: db: %v", err)
+	}
+	t.Cleanup(func() { db.Close() })
+	return db
+}
+
+func TestColumnExists(t *testing.T) {
+	t.Run("columna existente retorna true", func(t *testing.T) {
+		db := openMemDB(t)
+		if _, err := db.Exec(`CREATE TABLE t (id INTEGER PRIMARY KEY, name TEXT)`); err != nil {
+			t.Fatal(err)
+		}
+		got, err := ColumnExists(db, "t", "name")
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if !got {
+			t.Errorf("expected true for existing column 'name'")
+		}
+	})
+
+	t.Run("columna inexistente retorna false", func(t *testing.T) {
+		db := openMemDB(t)
+		if _, err := db.Exec(`CREATE TABLE t (id INTEGER PRIMARY KEY)`); err != nil {
+			t.Fatal(err)
+		}
+		got, err := ColumnExists(db, "t", "missing")
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if got {
+			t.Errorf("expected false for missing column")
+		}
+	})
+
+	t.Run("tabla inexistente retorna false sin error", func(t *testing.T) {
+		db := openMemDB(t)
+		got, err := ColumnExists(db, "no_such_table", "col")
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if got {
+			t.Errorf("expected false for non-existent table")
+		}
+	})
+}