Release 1.3.0: onboarding UX, charts paywall banner, re-engagement notifications, Crashlytics

- Crashlytics: add FirebaseCrashlytics framework + dSYM upload build phase
- Onboarding: useSampleData off by default, Add First Investment as primary CTA
- AddSourceView: contextual placeholder and footer explaining what a source is
- Charts: CompactPaywallBanner visible to free users on every visit
- Notifications: re-engagement (7d) and monthly check-in local notifications
- Paywall: decorative chart preview replacing static crown icon
- Localization: all new strings in en + es-ES

PortfolioJournal/Resources/en.lproj/Localizable.strings

@@ -280,3 +280,19 @@
 // MARK: - Monthly Check-in Card
 "checkin_update_month" = "Update %@";
 "checkin_start_new" = "Start";
+
+// MARK: - Re-engagement & Monthly Notifications (1.2.1)
+"reengagement_title" = "Your portfolio is waiting";
+"reengagement_body" = "A few minutes is all it takes to stay on top of your investments.";
+"monthly_checkin_notification_title" = "Time for your monthly update";
+"monthly_checkin_notification_body" = "Log this month's values and track your portfolio growth.";
+
+// MARK: - Onboarding QuickStart (1.3.0)
+"onboarding_quickstart_title" = "Almost there";
+"onboarding_quickstart_subtitle" = "Add your first investment source to start tracking your portfolio.";
+"onboarding_add_first_source" = "Add My First Investment";
+"onboarding_import_data" = "Import Existing Data";
+
+// MARK: - AddSourceView (1.3.0)
+"add_source_name_placeholder" = "e.g. MSCI World ETF, ING Savings, Apartment...";
+"add_source_name_footer" = "A source is any investment you want to track: stocks, ETFs, savings accounts, real estate, crypto, and more.";