fix: reset workout log each new day + new app logo

KC-1: Set completion was stored permanently on the program, so the same
program scheduled on back-to-back days (e.g. Shoulders Mon + Tue) kept
yesterday's checkmarks. Add resetSetsForNewDayIfNeeded() to clear every
set's isDone when the calendar day changes (cold launch, onAppear, and
scenePhase active). Streak history is untouched.

KC-2: Replace all 12 AppIcon sizes with the new KisaniCal mark, alpha
flattened onto RGB(26,29,34) so the 1024 App Store icon is fully opaque.

Add KisaniCal/ISSUES.md tracker (KC-1, KC-2: In Progress).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

KisaniCal/ContentView.swift

@@ -93,6 +93,7 @@ struct ContentView: View {
         }
         .onAppear {
             if !hasOnboarded { showOnboarding = true }
+            workoutVM.resetSetsForNewDayIfNeeded()
             CloudSyncManager.shared.restoreSettings()
             CloudSyncManager.shared.backupSettings()
             HealthKitManager.shared.bootstrap()
@@ -108,6 +109,7 @@ struct ContentView: View {
             if phase == .active {
                 taskVM.reload()
                 consumeWidgetAddTask()
+                workoutVM.resetSetsForNewDayIfNeeded()
                 workoutVM.checkPendingHealthConfirm()
                 CloudSyncManager.shared.backupSettings()
                 NotificationManager.shared.reschedule(workoutVM: workoutVM, taskVM: taskVM)