Add error handling for dictionary save operations

VoiceInk/Views/Dictionary/EditReplacementSheet.swift

@@ -159,8 +159,13 @@ struct EditReplacementSheet: View {
         // Update the replacement
         replacement.originalText = newOriginal
         replacement.replacementText = newReplacement
-        try? modelContext.save()
 
-        dismiss()
+        do {
+            try modelContext.save()
+            dismiss()
+        } catch {
+            alertMessage = "Failed to save changes: \(error.localizedDescription)"
+            showAlert = true
+        }
     }
 }

VoiceInk/Views/Dictionary/VocabularyView.swift

@@ -154,12 +154,24 @@ struct VocabularyView: View {
 
         let newWord = VocabularyWord(word: normalizedWord)
         modelContext.insert(newWord)
-        try? modelContext.save()
+
+        do {
+            try modelContext.save()
+        } catch {
+            alertMessage = "Failed to add word: \(error.localizedDescription)"
+            showAlert = true
+        }
     }
 
     private func removeWord(_ word: VocabularyWord) {
         modelContext.delete(word)
-        try? modelContext.save()
+
+        do {
+            try modelContext.save()
+        } catch {
+            alertMessage = "Failed to remove word: \(error.localizedDescription)"
+            showAlert = true
+        }
     }
 }
 

VoiceInk/Views/Dictionary/WordReplacementView.swift

@@ -221,15 +221,26 @@ struct WordReplacementView: View {
         // Add new replacement
         let newReplacement = WordReplacement(originalText: original, replacementText: replacement)
         modelContext.insert(newReplacement)
-        try? modelContext.save()
 
-        originalWord = ""
-        replacementWord = ""
+        do {
+            try modelContext.save()
+            originalWord = ""
+            replacementWord = ""
+        } catch {
+            alertMessage = "Failed to add replacement: \(error.localizedDescription)"
+            showAlert = true
+        }
     }
 
     private func removeReplacement(_ replacement: WordReplacement) {
         modelContext.delete(replacement)
-        try? modelContext.save()
+
+        do {
+            try modelContext.save()
+        } catch {
+            alertMessage = "Failed to remove replacement: \(error.localizedDescription)"
+            showAlert = true
+        }
     }
 }