The fullscreen button in the chart toolbar carried aria-pressed={fullscreen}
but had no active-state visual differentiation — only its label flipped
("⛶ 전체화면" ↔ "⛶ 해제"). Its sibling toggles in the same row (SMA presets,
RSI, MACD) all use the canonical zinc token (border-zinc-600 bg-zinc-800/80
text-zinc-100 when active). Sighted users got an inconsistent press-feedback
within a single toolbar.
Switch fullscreen to the same conditional className pattern. CSV button next
to it is intentionally not a toggle so stays unchanged.
Other aria-pressed carriers audited and left as-is:
- PeriodTabs: intentionally rose-500 (primary control must stand out from
zinc toolbar buttons, comment already documents this)
- StarButton: intentionally amber (favorite/star semantic)
- InvestorCumulative / StockChart SMA presets / RSI / MACD: already on the
canonical zinc token
c172f244e3