feat: replace calendar day modal with dedicated day-view page

Calendar day clicks now navigate to /experiments/:id/day/:date
(with ?field= param). ExperimentDayView shows a sticky-column table
of all subjects with data that day, inline edit via modal, and a
session-metrics bar chart from analysis_summary. Subject name links
to /daily-statuses/:id. Backend adds ?date= filtering to
GET /experiments/:id/daily-statuses.

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

frontend/src/pages/ExperimentDetail.jsx

@@ -372,15 +372,6 @@ export default function ExperimentDetail() {
           experimentId={id}
           template={dailyTemplate}
           allStatuses={experimentStatuses}
-          animals={animals}
-          onStatusChange={(updated) => {
-            setExperimentStatuses((prev) =>
-              prev.map((s) => (s.id === updated.id ? updated : s))
-            );
-          }}
-          onStatusCreate={(created) => {
-            setExperimentStatuses((prev) => [...prev, created]);
-          }}
         />
       )}