Consolidate /paper into ONE "Paper books" page (crypto simulated + IBKR real,
both clickable -> holdings detail); the holdings detail shows what it's holding
(assets + shares + value + %), recent trades (cost-to-trade %), value-over-time
(real vs plan) + per-strategy breakdown. Overview gets a plain "real trades"
sub-line + "behind plan" pill. HARD RULE: plain language, no dev jargon — a
single display_names map is the source of every rendered name; REAL PAPER vs
PAPER badges. Backtests page includes the IBKR tracks (D1).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>