chore: unify log formatting

app/log.js

@@ -0,0 +1,23 @@
+export function section(title) {
+  console.log(`\n=== ${title} ===`);
+}
+
+export function step(stepName, title) {
+  console.log(`\n[${stepName}] ${title}`);
+}
+
+export function line(message) {
+  console.log(`  - ${message}`);
+}
+
+export function ok(message) {
+  console.log(`  ✓ ${message}`);
+}
+
+export function warn(message) {
+  console.log(`  ! ${message}`);
+}
+
+export function error(message) {
+  console.error(`  x ${message}`);
+}