Fix dashboard date showing yesterday due to UTC parsing

Date-only ISO strings are parsed as UTC midnight, which displays
as the previous day in US timezones. Append T00:00:00 to force
local time interpretation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/views/Dashboard.tsx

@@ -40,7 +40,8 @@ export function Dashboard({
   const lowBulk = stats.lowStockBulk;
   const lowDiscrete = stats.lowStockDiscreteGroups;
 
-  const todayDate = new Date(data.today || TODAY_STR);
+  const todayStr = data.today || TODAY_STR;
+  const todayDate = new Date(todayStr + "T00:00:00");
   const greetingDate = todayDate.toLocaleDateString("en-US", {
     weekday: "long",
     month: "long",