fix: update admin token check logic and improve comments for clarity

feat: add condition to only delete manually added stocks from DB
docs: clarify stock notes saving method and Alpaca mode indicator fetching
chore: update binary database file

docs/superpowers/specs/2026-05-16-settings-page-redesign.md

@@ -18,7 +18,7 @@ Replace the current bare-bones settings page (a flat list of JSON textareas) wit
   - `trading.stopLossPercent` - number
   - `trading.riskMethod` - string ("fixed" | "percentage" | "atr")
 - **Saves** via `PUT /api/admin/settings/:key` with optimistic UI update
-- **Stock notes** saved via `POST /api/stocks` with ticker + notes
+- **Stock notes** saved via `POST /api/stocks` with FormData: `{ ticker, notes }`
 - **Loading state** shown while initial fetch completes
 
 ### Layout
@@ -48,7 +48,7 @@ Replace the current bare-bones settings page (a flat list of JSON textareas) wit
 - Pagination if >20 stocks
 
 ### System
-- Alpaca mode indicator (paper/live) - read-only, derived from env
+- Alpaca mode indicator (paper/live) - read-only, fetched from `/api/alpaca/account` or derived from `ALPACA_BASE_URL` env var
 - Admin token management
 - Fallback JSON textarea for any raw `AppSetting` keys not covered above