fix(sheets): ask before a dismissal drops typed input

The eight-step medication wizard, the add sheets on /measurements,
/mood and /labs, and the visit, vaccination, practitioner and checkup
forms closed on a stray backdrop tap or swipe and lost what was typed.
The dashboard quick entry and the capture menu asked first, through two
hand-copied dialogs and a DOM check that read the first sheet body in
the document and counted the date field's prefilled "now" as input.

ResponsiveSheet now takes a dirty flag, or a check it hands its own
body, and asks with the existing discard dialog. Forms that keep a seed
pass whether they differ from it; the wizard compares what a save would
send. Plain add forms pass the DOM check, which skips the date and time
fields again. The three copies of the dialog are gone.

src/__tests__/baselines/source-function-lines.json

@@ -45,7 +45,7 @@
     "app/insights/catalog/page.tsx :: MetricCatalogPage": 204,
     "app/insights/medications/page.tsx :: InsightsMedikamentePage": 265,
     "app/insights/page-client.tsx :: InsightsPageClient": 375,
-    "app/labs/page.tsx :: LabsPage": 216,
+    "app/labs/page.tsx :: LabsPage": 217,
     "app/medications/page-client.tsx :: MedicationsPageClient": 590,
     "app/notifications/page.tsx :: NotificationsPage": 327,
     "components/activity/activity-calendar-card.tsx :: ActivityCalendarCard": 470,
@@ -139,12 +139,11 @@
     "components/labs/ocr-row-editor.tsx :: OcrRowEditor": 378,
     "components/layout/auth-shell.tsx :: AuthShell": 518,
     "components/layout/bottom-nav.tsx :: BottomNav": 262,
-    "components/layout/capture-picker.tsx :: CapturePicker": 235,
     "components/layout/sidebar-nav.tsx :: SidebarNav": 356,
     "components/layout/top-bar.tsx :: TopBar": 212,
     "components/links/entity-link-picker.tsx :: EntityLinkPicker": 392,
     "components/measurement-reminders/vorsorge-dashboard-card.tsx :: VorsorgeDashboardCard": 215,
-    "components/measurement-reminders/vorsorge-section.tsx :: VorsorgeSection": 352,
+    "components/measurement-reminders/vorsorge-section.tsx :: VorsorgeSection": 354,
     "components/measurements/measurement-form.tsx :: MeasurementForm": 500,
     "components/medications/detail/efficacy/efficacy-chart.tsx :: EfficacyChart": 361,
     "components/medications/detail/medication-detail-tabs.tsx :: MedicationDetailTabs": 767,
@@ -230,7 +229,7 @@
     "components/timeline/timeline-chart.tsx :: ChartBody": 236,
     "components/timeline/timeline-chronicle.tsx :: TimelineChronicle": 246,
     "components/timeline/timeline-view.tsx :: TimelineView": 486,
-    "components/ui/responsive-sheet.tsx :: ResponsiveSheet": 239,
+    "components/ui/responsive-sheet.tsx :: ResponsiveSheet": 253,
     "components/vaccinations/catalog-picker.tsx :: CatalogPicker": 221,
     "components/vaccinations/custom-vaccine-sheet.tsx :: CustomVaccineSheet": 246,
     "components/vaccinations/vaccination-form.tsx :: VaccinationForm": 218,