Trading Options

### Added - **Persistent watchlists** — the watchlist now saves across launches. Symbols are stored in `UserDefaults` and restored on startup (falling back to the default list on first run); prices and bars are still re-fetched from the network on refresh. (`ViewModels.swift`) - **Strategies in the symbol options sheet** — the "Options" button under each dashboard watchlist tile now opens a sheet with a **Chain / Strategies** switcher. The Strategies tab shows the full strategy grid preset to that symbol, and selecting one opens the builder already scoped to the ticker. (`WatchlistView.swift`, `OptionsStrategies.swift`) - **Live leaderboard standings** — the leaderboard now reads back real Game Center entries for the selected period (Today/Week/All Time) and merges other players into the list, instead of only ever showing the local user. Falls back silently to local-only data when the leaderboard is unconfigured or offline. (`LeaderboardView.swift`) ### Changed - **Dashboard "Gainers" → "Blue Chips"** — the Hot Stocks section's first tab now shows a curated list of large-cap blue-chip stocks (AAPL, MSFT, JPM, JNJ, V, PG, KO, WMT, XOM, UNH) with live snapshot data, replacing the market top gainers. Tab accent recolored to blue. (`DashboardView.swift`, `ViewModels.swift`)