feat(keyboard): add haptic feedback on key press

Keyboards/KeyboardsBase/KeyboardViewController.swift

@@ -1982,6 +1982,15 @@ class KeyboardViewController: UIInputViewController {
         }
     }
 
+    func hapticFeedbackIsEnabled() -> Bool {
+        let langCode = languagesAbbrDict[controllerLanguage] ?? "unknown"
+        if let userDefaults = UserDefaults(suiteName: "group.be.scri.userDefaultsContainer") {
+            let dictionaryKey = langCode + "HapticFeedback"
+            return userDefaults.bool(forKey: dictionaryKey)
+        }
+        return false // default off
+    }
+
     // MARK: Button Actions
 
     /// Triggers actions based on the press of a key.
@@ -2542,6 +2551,32 @@ class KeyboardViewController: UIInputViewController {
         } else {
             sender.backgroundColor = keyPressedColor
         }
+
+        // Haptic feedback on key press.
+        // Heavy: destructive/dismiss actions.
+        // Medium: command, navigation, and action keys.
+        // Light: all regular character keys.
+        guard hapticFeedbackIsEnabled() else { return }
+        let heavyKeys = ["delete", "hideKeyboard"]
+        let mediumKeys = [
+            "shift", "return", "Translate", "Conjugate", "Plural",
+            "AutoAction0", "AutoAction1", "AutoAction2",
+            "EmojiKey0", "EmojiKey1", "EmojiKey2",
+            "GetAnnotationInfo", "ScribeAnnotation",
+            "shiftFormsDisplayLeft", "shiftFormsDisplayRight",
+            "ABC", "АБВ", "123", "#+=", ".?123", "selectKeyboard",
+            SpecialKeys.indent, SpecialKeys.capsLock,
+            spaceBar, languageTextForSpaceBar
+        ]
+        let style: UIImpactFeedbackGenerator.FeedbackStyle
+        if heavyKeys.contains(originalKey) {
+            style = .heavy
+        } else if mediumKeys.contains(originalKey) {
+            style = .medium
+        } else {
+            style = .light
+        }
+        UIImpactFeedbackGenerator(style: style).impactOccurred()
     }
 
     /// Shows the conjugation view for verbs.

Scribe/ParentTableCellModel.swift

@@ -71,6 +71,7 @@ enum UserInteractiveState {
     case toggleAccentCharacters
     case toggleWordForWordDeletion
     case increaseTextSize
+    case hapticFeedback
     case none
 }
 

Scribe/SettingsTab/SettingsTableData.swift

@@ -153,6 +153,12 @@ enum SettingsTableData {
                         value: "Delete text word by word when the delete key is pressed and held.",
                         comment: ""
                     )
+                ),
+                Section(
+                    sectionTitle: "Haptic feedback",
+                    hasToggle: true,
+                    sectionState: .none(.hapticFeedback),
+                    shortDescription: "Enable haptic feedback on key press."
                 )
             ],
             hasDynamicData: nil

Scribe/Views/Cells/InfoChildTableViewCell/InfoChildTableViewCell.swift

@@ -158,6 +158,10 @@ final class InfoChildTableViewCell: UITableViewCell {
             let dictionaryKey = languageCode + "WordForWordDeletion"
             userDefaults.setValue(toggleSwitch.isOn, forKey: dictionaryKey)
 
+        case .hapticFeedback:
+            let dictionaryKey = languageCode + "HapticFeedback"
+            userDefaults.setValue(toggleSwitch.isOn, forKey: dictionaryKey)
+
         case .increaseTextSize:
             userDefaults.setValue(toggleSwitch.isOn, forKey: "increaseTextSize")
             initializeFontSize()
@@ -211,6 +215,14 @@ final class InfoChildTableViewCell: UITableViewCell {
                 toggleSwitch.isOn = false // default off
             }
 
+        case .hapticFeedback:
+            let dictionaryKey = languageCode + "HapticFeedback"
+            if let toggleValue = userDefaults.object(forKey: dictionaryKey) as? Bool {
+                toggleSwitch.isOn = toggleValue
+            } else {
+                toggleSwitch.isOn = false // default off
+            }
+
         case .increaseTextSize:
             if let toggleValue = userDefaults.object(forKey: "increaseTextSize") as? Bool {
                 toggleSwitch.isOn = toggleValue