Add feature batch 2, subscription/recurring sync, smooth charts, and app icon

- Implement subscriptions view with bidirectional recurring transaction sync
- Add cascade delete/pause/resume between subscriptions and recurring
- Fix foreign key constraints when deleting recurring transactions
- Add cross-view instant refresh via callback pattern
- Replace Bezier chart smoothing with Fritsch-Carlson monotone Hermite interpolation
- Smooth budget sparklines using shared monotone_subdivide function
- Add vertical spacing to budget rows
- Add app icon (receipt on GNOME blue) in all sizes for desktop, web, and AppImage
- Add calendar, credit cards, forecast, goals, insights, and wishlist views
- Add date picker, numpad, quick-add, category combo, and edit dialog components
- Add import/export for CSV, JSON, OFX, QIF formats
- Add NLP transaction parsing, OCR receipt scanning, expression evaluator
- Add notification support, Sankey chart, tray icon
- Add demo data seeder with full DB wipe
- Expand database schema with subscriptions, goals, credit cards, and more

outlay-core/Cargo.toml

@@ -3,6 +3,10 @@ name = "outlay-core"
 version.workspace = true
 edition.workspace = true
 
+[[bin]]
+name = "seed-demo"
+path = "src/bin/seed_demo.rs"
+
 [dependencies]
 rusqlite = { version = "0.38", features = ["bundled"] }
 serde = { version = "1", features = ["derive"] }
@@ -14,3 +18,5 @@ reqwest = { version = "0.13", features = ["json"] }
 tokio = { version = "1", features = ["rt", "macros"] }
 zip = "2"
 thiserror = "2"
+pdf-extract = "0.7"
+rand = "0.8"