Smarter onboarding and monthly reminders:

• Redesigned first-run experience — a single clear action to add your first investment, no setup friction
• Monthly reminders — optional notifications so you never forget your monthly portfolio update
• Charts preview — free users now see which charts are available before upgrading
• Improved paywall — a live portfolio chart preview shows what full access looks like
• Clearer source setup — added a short description when creating your first investment source
