Refactor UI: move Splits to Settings, redesign ExerciseView

Schema & Models:
- Add notes, loadType, duration fields to WorkoutLog
- Align Watch schema with iOS (use duration Date instead of separate mins/secs)
- Add duration helper properties to Exercise and WorkoutLog

UI Changes:
- Remove Splits and Settings tabs, single Workout Logs view
- Add gear button in nav bar to access Settings as sheet
- Move Splits section into Settings view with inline list
- Redesign ExerciseView with read-only Plan/Notes tiles and Edit buttons
- Add PlanEditView and NotesEditView with Cancel/Save buttons
- Auto-dismiss ExerciseView when completing last set
- Navigate to ExerciseView when adding new exercise

Data Flow:
- Plan edits sync to both WorkoutLog and corresponding Exercise
- Changes propagate up navigation chain via CoreData

.claude/settings.local.json

@@ -10,7 +10,10 @@
       "Bash(xcrun simctl install:*)",
       "Bash(xcrun simctl launch:*)",
       "Bash(xcrun simctl get_app_container:*)",
-      "Bash(log show:*)"
+      "Bash(log show:*)",
+      "Bash(git add:*)",
+      "Bash(git commit:*)",
+      "Bash(git push:*)"
     ],
     "deny": [],
     "ask": []