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Found and fixed two real bugs via\nPlaywright verification against the running dev server: (1) a date-only ISO\nstring (\"2026-09-07\") parses as UTC midnight, which showed the previous\nweekday in any timezone behind UTC — fixed by treating bare date strings as\nlocal calendar days; (2) resolving series color reactively from\n",{"type":30,"tag":38,"props":323,"children":325},{"className":324},[],[326],{"type":35,"value":327},"colorScheme.value",{"type":35,"value":329}," (needed since these are literal hexes, not ",{"type":30,"tag":38,"props":331,"children":333},{"className":332},[],[334],{"type":35,"value":335},"qp()",{"type":35,"value":337}," CSS\nvars) hit the exact SSR\u002Fhydration-mismatch case ",{"type":30,"tag":38,"props":339,"children":341},{"className":340},[],[342],{"type":35,"value":343},"ThemeToggle.vue",{"type":35,"value":345}," already\ndocuments — fixed with the same ",{"type":30,"tag":38,"props":347,"children":349},{"className":348},[],[350],{"type":35,"value":351},"mounted",{"type":35,"value":353},"-gated pattern, verified by loading\nthe page fresh with dark mode already stored (not just toggling live).\nMark then flagged that columns were stretching to fill wide containers\n(",{"type":30,"tag":38,"props":355,"children":357},{"className":356},[],[358],{"type":35,"value":359},"flex-1",{"type":35,"value":361}," on both the columns row and each column) instead of sitting at\ntheir natural pictogram size — discussed two options and chose \"fixed width\nthat can shrink but never grow\" over \"always fixed\" so a 7-day chart stays\ncompact while a 60-day one still compresses to fit. 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