feat(DISPLAY-002): GLD mode shows real share prices

docs/roadmap/in-progress/DISPLAY-002-gld-mode-no-conversion.yaml

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+id: DISPLAY-002
+title: GLD Mode Shows Real GLD Pricing
+status: done
+priority: P0
+size: S
+depends_on:
+  - DISPLAY-001
+tags: [ui, gld-mode]
+summary: In GLD display mode, show real GLD share prices without conversion to physical gold.
+acceptance_criteria:
+  - GLD mode shows position quantity as "shares" not "oz"
+  - GLD mode shows position value as `shares × GLD_price` not converted to gold
+  - Entry price shown as GLD share price at time of purchase
+  - P&L calculated as `(current_GLD_price - entry_GLD_price) × shares`
+  - LTV calculated using GLD position value as collateral
+  - Options strike selection in GLD mode uses GLD share prices directly
+  - Hedge cost shown as $/share or $/position, not $/oz
+implementation_notes:
+  - Added `display_mode` field to PortfolioConfig (default: "XAU")
+  - Created app/domain/conversions.py for display mode conversion utilities
+  - Updated portfolio_math.py to respect display_mode in spot resolution and snapshots
+  - Updated overview.py to show share prices/units in GLD mode
+  - Updated hedge.py to show share prices/units in GLD mode
+  - Updated settings.py to allow display mode selection
+  - Added tests/test_display_mode.py with comprehensive test coverage
+  - Default display mode remains "XAU" to preserve existing behavior
+  - GLD mode short-circuits conversion logic, showing share prices directly
+completed: 2026-03-28