fix(sheets): ask before a dismissal drops an edit that keeps no seed

The illness episode, cycle day, custom metric, target, mood tag, symptom
and life event sheets open filled from a record or a fetch, so the body
check cannot tell typed input from what was loaded, and a stray tap
outside or a swipe dropped the change without asking. Each now keeps
what it opened with (the cycle day once its fetch has hydrated the form)
and passes whether the fields differ to the sheet's dismissal guard. The
custom metric and life event forms report it to their hosts the way the
workout form does.

The size baselines of the six sheet functions and the cycle sheet file
are raised by the few lines the comparison takes.

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

@@ -1,7 +1,7 @@
 {
   "$comment": "Production functions over 200 lines, keyed \"file :: name\", and their length. Maintained by src/__tests__/source-size-ratchet.test.ts.",
   "count": 336,
-  "total": 109333,
+  "total": 109378,
   "entries": {
     "app/achievements/page.tsx :: AchievementsPage": 206,
     "app/api/admin/backups/upload/route.ts :: apiHandler(arg)": 275,
@@ -74,14 +74,14 @@
     "components/clinician/clinician-view.tsx :: ClinicianView": 223,
     "components/command-palette/command-palette.tsx :: PaletteBody": 333,
     "components/custom-metrics/custom-metric-chart.tsx :: CustomMetricChart": 228,
-    "components/custom-metrics/custom-metric-detail.tsx :: CustomMetricDetail": 277,
-    "components/custom-metrics/custom-metric-form.tsx :: CustomMetricForm": 210,
+    "components/custom-metrics/custom-metric-detail.tsx :: CustomMetricDetail": 280,
+    "components/custom-metrics/custom-metric-form.tsx :: CustomMetricForm": 212,
     "components/custom-metrics/custom-metric-history-list.tsx :: CustomMetricHistoryList": 298,
     "components/cycle/bbt-chart.tsx :: BbtChart": 244,
     "components/cycle/cycle-calendar.tsx :: CycleCalendar": 292,
     "components/cycle/cycle-settings.tsx :: CycleSettings": 228,
     "components/cycle/cycle-view.tsx :: CycleView": 403,
-    "components/cycle/log-day-sheet.tsx :: LogDaySheet": 753,
+    "components/cycle/log-day-sheet.tsx :: LogDaySheet": 760,
     "components/daily/today-hero.tsx :: TodayHero": 488,
     "components/dashboard/dashboard-header.tsx :: DashboardHeader": 215,
     "components/dashboard/medication-intake-quick-add.tsx :: MedicationIntakeQuickAdd": 383,
@@ -98,7 +98,7 @@
     "components/documents/documents-view.tsx :: DocumentsView": 303,
     "components/documents/sources/document-source-picker.tsx :: DocumentSourcePicker": 563,
     "components/illness/log-day-sheet.tsx :: LogDaySheet": 265,
-    "components/illness/new-episode-sheet.tsx :: NewEpisodeSheet": 264,
+    "components/illness/new-episode-sheet.tsx :: NewEpisodeSheet": 278,
     "components/insights/coach-panel/chat-bubble.tsx :: ChatBubbleImpl": 417,
     "components/insights/coach-panel/coach-conversation.tsx :: CoachConversation": 1002,
     "components/insights/coach-panel/coach-input.tsx :: CoachInput": 259,
@@ -221,8 +221,8 @@
     "components/symptoms/symptom-entry-form.tsx :: SymptomEntryForm": 317,
     "components/symptoms/symptoms-section.tsx :: SymptomsSection": 205,
     "components/targets/range-bar.tsx :: RangeBar": 215,
-    "components/targets/target-edit-sheet.tsx :: TargetEditSheetBody": 473,
-    "components/timeline/life-event-form.tsx :: LifeEventForm": 281,
+    "components/targets/target-edit-sheet.tsx :: TargetEditSheetBody": 486,
+    "components/timeline/life-event-form.tsx :: LifeEventForm": 287,
     "components/timeline/timeline-chart.tsx :: ChartBody": 236,
     "components/timeline/timeline-chronicle.tsx :: TimelineChronicle": 246,
     "components/timeline/timeline-view.tsx :: TimelineView": 478,