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

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

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-id: DISPLAY-002
-title: GLD Mode Shows Real GLD Pricing
-status: backlog
-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
-notes:
-  - This is the key insight: GLD mode should NOT convert to gold
-  - User bought shares, they think in shares, they should see share metrics
-  - GLD backing decay is irrelevant in GLD mode (baked into price)
-  - Only when switching to XAU mode is conversion needed
-implementation_hints:
-  - GLD mode short-circuits conversion logic
-  - Overview in GLD mode: position value = shares × GLD_price
-  - Hedge in GLD mode: strike = GLD_share_price × strike_pct
-  - Add `position.is_gld()` helper to check display treatment