Import/export fixes, icon, and graphing

ios/OpenClimb/Views/AddEdit/AddAttemptView.swift

@@ -76,10 +76,10 @@ struct AddAttemptView: View {
         .onAppear {
             setupInitialValues()
         }
-        .onChange(of: selectedClimbType) { _ in
+        .onChange(of: selectedClimbType) {
             updateDifficultySystem()
         }
-        .onChange(of: selectedDifficultySystem) { _ in
+        .onChange(of: selectedDifficultySystem) {
             resetGradeIfNeeded()
         }
     }
@@ -182,8 +182,12 @@ struct AddAttemptView: View {
             }
 
             if selectedDifficultySystem == .custom {
-                TextField("Grade (Required)", text: $newProblemGrade)
+                TextField("Grade (Required - numbers only)", text: $newProblemGrade)
                     .keyboardType(.numberPad)
+                    .onChange(of: newProblemGrade) {
+                        // Filter out non-numeric characters
+                        newProblemGrade = newProblemGrade.filter { $0.isNumber }
+                    }
             } else {
                 VStack(alignment: .leading, spacing: 8) {
                     Text("Grade (Required)")
@@ -526,7 +530,7 @@ struct EditAttemptView: View {
     }
 
     private func updateAttempt() {
-        guard let problem = selectedProblem else { return }
+        guard selectedProblem != nil else { return }
 
         let updatedAttempt = attempt.updated(
             result: selectedResult,