feat: add light mode to web dashboard - #67
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Adds a sepia-parchment light theme alongside the existing Coco Orange Phosphor dark theme so users on light-mode systems aren't blasted with cream-on-near-black. Theme follows OS preference on first visit, then persists user choice in localStorage. Coverage is end-to-end: CSS variables, Prism syntax highlighting, Chart.js colors, log category colors, and the tab favicon all switch atomically on toggle, with a FOUC-prevention inline script in <head> to avoid a flash of dark content during boot. CRT scanline + vignette effects are disabled in light mode (they look muddy on a cream background). Dark mode is byte-for-byte unchanged for users who never toggle. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Adds a sepia-parchment light theme alongside the existing Coco Orange Phosphor dark theme so users on light-mode systems aren't blasted with cream-on-near-black. Theme follows OS preference on first visit, then persists user choice in localStorage. Coverage is end-to-end: CSS variables, Prism syntax highlighting, Chart.js colors, log category colors, and the tab favicon all switch atomically on toggle, with a FOUC-prevention inline script in to avoid a flash of dark content during boot.
CRT scanline + vignette effects are disabled in light mode (they look muddy on a cream background). Dark mode is byte-for-byte unchanged for users who never toggle.