fix(mapgen-studio): apply flash guard to :root for between-navigations clear color#1640
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refactor(studio): decompose App.tsx non-React corpus into feature modules and shared utilities
#1608
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…paint background + color-scheme
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Fixes the bright white flash that appeared when refreshing the studio in dark mode.
The browser's between-navigations clear color is determined by the root element's background and
color-scheme, not<body>. The existing flash guard only styledbody, leaving a window from navigation commit until body paint where the root hadbackground: transparentandcolor-scheme: normal— causing every paintable moment in that gap to clear to white.The fix adds
:root { color-scheme: dark; background: #0d0d11; }to the inline flash guard so the dark background is established before any paint opportunity (~8ms vs ~138ms previously). The theme script's light-mode branch is updated symmetrically to also override:rootwithcolor-scheme: lightand the light background, so light users receive the same guarantee.