feat(DISPLAY-001): add underlying mode switching

app/pages/settings.py

@@ -8,6 +8,7 @@ from uuid import uuid4
 from fastapi.responses import RedirectResponse
 from nicegui import ui
 
+from app.domain.conversions import get_display_mode_options
 from app.models.portfolio import PortfolioConfig
 from app.models.position import Position
 from app.models.workspace import get_workspace_repository
@@ -126,6 +127,7 @@ def settings_page(workspace_id: str) -> None:
             fallback_source=str(fallback_source.value),
             refresh_interval=parsed_refresh_interval,
             underlying=str(underlying.value),
+            display_mode=str(display_mode.value),
             volatility_spike=float(vol_alert.value),
             spot_drawdown=float(price_alert.value),
             email_alerts=bool(email_alerts.value),
@@ -257,6 +259,16 @@ def settings_page(workspace_id: str) -> None:
                     value=config.underlying,
                     label="Underlying instrument",
                 ).classes("w-full")
+
+                display_mode = ui.select(
+                    get_display_mode_options(),
+                    value=config.display_mode,
+                    label="Display Mode",
+                ).classes("w-full")
+                ui.label("Choose how to display positions and collateral values.").classes(
+                    "text-xs text-slate-500 dark:text-slate-400 -mt-2"
+                )
+
                 primary_source = ui.select(
                     ["yfinance", "ibkr", "alpaca"],
                     value=config.primary_source,
@@ -609,6 +621,7 @@ def settings_page(workspace_id: str) -> None:
             primary_source,
             fallback_source,
             refresh_interval,
+            display_mode,
         ):
             element.on_value_change(update_calculations)