feat: add Citations and WatchlistChat components, integrate with API

- Implemented Citations component to display citation data.
- Created WatchlistDrawer and ChatSidebar components for managing watchlists and AI chat functionality.
- Integrated API calls for watchlist management and chat interactions.
- Updated index.tsx to include new components in the main application layout.
- Added API client in lib/api.ts for structured API interactions.
- Developed Alerts, Dashboard, Portfolio, Routines, Screener, and Report pages with relevant data fetching and UI components.
- Introduced styles in tokens.css for consistent theming across the application.
- Configured TypeScript and Vite for project setup and development.

backend/internal/store/seed_test.go

@@ -0,0 +1,35 @@
+package store
+
+import (
+	"testing"
+)
+
+// Seed loads the historical week; row counts must match the fixture manifest.
+func TestSeed(t *testing.T) {
+	db, err := Open(t.TempDir() + "/seed.db")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	st, err := db.SeedFromDir("../../tests/fixtures", "demo")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if st.Snapshots != 23 {
+		t.Fatalf("snapshots = %d, want 23", st.Snapshots)
+	}
+	if st.Watchlist != 2 {
+		t.Fatalf("watchlist = %d, want 2", st.Watchlist)
+	}
+	if got := db.SnapshotCount("daily"); got != 1 {
+		t.Fatalf("daily snapshots = %d, want 1", got)
+	}
+	// Idempotent re-seed.
+	st2, err := db.SeedFromDir("../../tests/fixtures", "demo")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if st2.Snapshots != 0 {
+		t.Fatalf("re-seed snapshots = %d, want 0", st2.Snapshots)
+	}
+}