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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":32,"tag":40,"props":325,"children":327},{"className":326},[],[328],{"type":37,"value":329},"colorScheme.value",{"type":37,"value":331}," (needed since these are literal hexes, not ",{"type":32,"tag":40,"props":333,"children":335},{"className":334},[],[336],{"type":37,"value":337},"qp()",{"type":37,"value":339}," CSS\nvars) hit the exact SSR\u002Fhydration-mismatch case ",{"type":32,"tag":40,"props":341,"children":343},{"className":342},[],[344],{"type":37,"value":345},"ThemeToggle.vue",{"type":37,"value":347}," already\ndocuments — fixed with the same ",{"type":32,"tag":40,"props":349,"children":351},{"className":350},[],[352],{"type":37,"value":353},"mounted",{"type":37,"value":355},"-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":32,"tag":40,"props":357,"children":359},{"className":358},[],[360],{"type":37,"value":361},"flex-1",{"type":37,"value":363}," 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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