Fix HomeView notification migration to use proper constants pattern

- Add NOTIFY_CONTACT_LOADING_ISSUE, NOTIFY_FEED_LOADING_ISSUE, and NOTIFY_CONFIRMATION_ERROR constants to notifications.ts
- Update HomeView.vue to import and use notification constants instead of literal strings
- Update migration templates to document constants vs literal strings pattern
- Add comprehensive documentation for notification constants usage

Ensures consistency with established pattern used in ActivityListItem.vue and other migrated components. Linter passes without errors.

src/constants/notifications.ts

@@ -9,4 +9,19 @@ export const NOTIFY_PERSON_HIDDEN = {
 export const NOTIFY_UNKNOWN_PERSON = {
   title: "Unidentified Person",
   message: "Nobody specific was recognized.",
-}; 
+};
+
+export const NOTIFY_CONTACT_LOADING_ISSUE = {
+  title: "Contact Loading Issue",
+  message: "Some contact information may be unavailable.",
+};
+
+export const NOTIFY_FEED_LOADING_ISSUE = {
+  title: "Feed Loading Issue",
+  message: "Some feed data may be unavailable. Pull to refresh.",
+};
+
+export const NOTIFY_CONFIRMATION_ERROR = {
+  title: "Error",
+  message: "There was a problem submitting the confirmation.",
+};