Enhance migration templates with critical omission prevention

Add comprehensive guidance to prevent common migration oversights:
- Remove unused notification imports
- Replace hardcoded timeout values with constants
- Remove legacy wrapper functions
- Extract long class attributes to computed properties
- Replace literal strings with constants

Based on lessons learned from ContactQRScanShowView.vue migration.
Includes validation commands and specific examples for each pattern.

src/constants/notifications.ts

@@ -1236,3 +1236,147 @@ export const NOTIFY_SEARCH_AREA_DELETED = {
   title: "Location Deleted",
   text: "Your stored search area has been removed. Location filtering is now disabled.",
 } as const;
+
+// ContactQRScanShowView.vue specific constants
+// Used in: ContactQRScanShowView.vue (created method - initialization error)
+export const NOTIFY_QR_INITIALIZATION_ERROR = {
+  title: "Initialization Error",
+  message: "Failed to initialize QR renderer or scanner. Please try again.",
+};
+
+// Used in: ContactQRScanShowView.vue (startScanning method - camera in use)
+export const NOTIFY_QR_CAMERA_IN_USE = {
+  title: "Camera in Use",
+  message: "Please close other applications using the camera and try again",
+};
+
+// Used in: ContactQRScanShowView.vue (startScanning method - camera access required)
+export const NOTIFY_QR_CAMERA_ACCESS_REQUIRED = {
+  title: "Camera Access Required",
+  message: "Please grant camera permission to scan QR codes",
+};
+
+// Used in: ContactQRScanShowView.vue (startScanning method - no camera)
+export const NOTIFY_QR_NO_CAMERA = {
+  title: "No Camera",
+  message: "No camera was found on this device",
+};
+
+// Used in: ContactQRScanShowView.vue (startScanning method - HTTPS required)
+export const NOTIFY_QR_HTTPS_REQUIRED = {
+  title: "HTTPS Required",
+  message: "Camera access requires a secure (HTTPS) connection",
+};
+
+// Used in: ContactQRScanShowView.vue (addNewContact method - contact exists)
+export const NOTIFY_QR_CONTACT_EXISTS = {
+  title: "Contact Exists",
+  message: "This contact has already been added to your list.",
+};
+
+// Used in: ContactQRScanShowView.vue (addNewContact method - contact added)
+export const NOTIFY_QR_CONTACT_ADDED = {
+  title: "Contact Added",
+  message: "They were added, and your activity is visible to them.",
+};
+
+// Used in: ContactQRScanShowView.vue (addNewContact method - contact added without visibility)
+export const NOTIFY_QR_CONTACT_ADDED_NO_VISIBILITY = {
+  title: "Contact Added",
+  message: "They were added.",
+};
+
+// Used in: ContactQRScanShowView.vue (addNewContact method - contact error)
+export const NOTIFY_QR_CONTACT_ERROR = {
+  title: "Contact Error",
+  message: "Could not save contact. Check if it already exists.",
+};
+
+// Used in: ContactQRScanShowView.vue (register method - registration submitted)
+export const NOTIFY_QR_REGISTRATION_SUBMITTED = {
+  title: "",
+  message: "Registration submitted...",
+};
+
+// Used in: ContactQRScanShowView.vue (register method - registration success)
+export const NOTIFY_QR_REGISTRATION_SUCCESS = {
+  title: "Registration Success",
+  message: " has been registered.",
+};
+
+// Used in: ContactQRScanShowView.vue (register method - registration error)
+export const NOTIFY_QR_REGISTRATION_ERROR = {
+  title: "Registration Error",
+  message: "Something went wrong during registration.",
+};
+
+// Used in: ContactQRScanShowView.vue (onCopyUrlToClipboard method - URL copied)
+export const NOTIFY_QR_URL_COPIED = {
+  title: "Copied",
+  message: "Contact URL was copied to clipboard.",
+};
+
+// Used in: ContactQRScanShowView.vue (toastQRCodeHelp method - QR code help)
+export const NOTIFY_QR_CODE_HELP = {
+  title: "QR Code Help",
+  message: "Click the QR code to copy your contact info to your clipboard.",
+};
+
+// Used in: ContactQRScanShowView.vue (onCopyDidToClipboard method - DID copied)
+export const NOTIFY_QR_DID_COPIED = {
+  title: "Copied",
+  message:
+    "Your DID was copied to the clipboard. Have them paste it in the box on their 'People' screen to add you.",
+};
+
+// Used in: ContactQRScanShowView.vue (onScanDetect method - invalid QR code)
+export const NOTIFY_QR_INVALID_QR_CODE = {
+  title: "Invalid QR Code",
+  message: "This QR code does not contain valid contact information. Scan a TimeSafari contact QR code.",
+};
+
+// Used in: ContactQRScanShowView.vue (onScanDetect method - invalid contact info)
+export const NOTIFY_QR_INVALID_CONTACT_INFO = {
+  title: "Invalid Contact Info",
+  message: "The contact information is incomplete or invalid.",
+};
+
+// Used in: ContactQRScanShowView.vue (onScanDetect method - missing DID)
+export const NOTIFY_QR_MISSING_DID = {
+  title: "Invalid Contact",
+  message: "The contact DID is missing.",
+};
+
+// Used in: ContactQRScanShowView.vue (onScanDetect method - unknown contact type)
+export const NOTIFY_QR_UNKNOWN_CONTACT_TYPE = {
+  title: "Error",
+  message: "Could not determine the type of contact info. Try again, or tap the QR code to copy it and send it to them.",
+};
+
+// Used in: ContactQRScanShowView.vue (onScanDetect method - processing error)
+export const NOTIFY_QR_PROCESSING_ERROR = {
+  title: "Error",
+  message: "Could not process QR code. Please try again.",
+};
+
+// Helper function for dynamic contact added messages
+// Used in: ContactQRScanShowView.vue (addNewContact method - dynamic contact added message)
+export function createQRContactAddedMessage(hasVisibility: boolean): string {
+  return hasVisibility
+    ? NOTIFY_QR_CONTACT_ADDED.message
+    : NOTIFY_QR_CONTACT_ADDED_NO_VISIBILITY.message;
+}
+
+// Helper function for dynamic registration success messages
+// Used in: ContactQRScanShowView.vue (register method - dynamic success message)
+export function createQRRegistrationSuccessMessage(
+  contactName: string,
+): string {
+  return `${contactName || "That unnamed person"}${NOTIFY_QR_REGISTRATION_SUCCESS.message}`;
+}
+
+// ContactQRScanShowView.vue timeout constants
+export const QR_TIMEOUT_SHORT = 1000;      // Short operations like registration submission
+export const QR_TIMEOUT_MEDIUM = 2000;     // Medium operations like URL copy
+export const QR_TIMEOUT_STANDARD = 3000;   // Standard success messages
+export const QR_TIMEOUT_LONG = 5000;       // Error messages and warnings