chore: remove unused UserMenu import from page.tsx

feat: hide UserMenu on trading page during game session

feat: implement user auth, daily limits, and built-in Vmq payment gateway

style: Eliminate empty space in mobile TradePanel and allow dynamic height for more chart space

fix: Resolve desktop layout clipping by allowing left side to shrink and enforcing TradePanel constraints

fix: Restore font sizes and increase TradePanel width to 450px to prevent clipping

fix: Final attempt to resolve TradePanel overflow with robust CSS and layout constraints

fix: Resolve TradePanel content clipping by increasing width and adding safety padding

fix: Further increase TradePanel width and padding to ensure full visibility on desktop

fix: Fix desktop layout centering and right margin issues

fix: Resolve syntax error in page.tsx (duplicate closing parenthesis)

fix: Restore desktop layout by removing flex-1 from TradePanel container

fix: Syntax error in page.tsx (extra closing parenthesis)

fix: Force mobile layout with explicit height and flex constraints

feat: Complete stock trading simulation system