- page.tsx: wrap PeriodTabs in overflow-x-auto + inner flex w-max min-w-full
justify-end so the leftmost tab is reachable when content exceeds container
(justify-end + overflow-x-auto alone clips negative direction in some browsers).
- StockChart: when fullscreen, render small "{name} {code}" leading label in the
toolbar — PriceHero is covered by the fixed inset overlay so the chart loses
symbol context otherwise. Toolbar (not canvas) so it doesn't overlap the
existing CrosshairLabel at top-left of the chart area.
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