Migrate DiscoverView.vue to Enhanced Triple Migration Pattern

- Replaced all databaseUtil and direct PlatformServiceFactory usage with PlatformServiceMixin methods
- Removed all raw SQL queries from the component
- Centralized all notification messages in src/constants/notifications.ts
- Replaced direct $notify calls with notification helpers and TIMEOUTS constants
- Streamlined template logic (tab classes via computed properties)
- Updated migration documentation and security audit
- Ran lint-fix; no errors remain

Ready for human testing and validation.

src/constants/notifications.ts

@@ -1017,5 +1017,25 @@ export const NOTIFY_GIFT_CONFIRM_MODAL = {
 // Used in: ConfirmGiftView.vue (copyToClipboard method - copied toast)
 export const NOTIFY_COPIED_TO_CLIPBOARD = {
   title: "Copied",
-  message: (description?: string) => `${description || "That"} was copied to the clipboard.`,
+  message: (description?: string) =>
+    `${description || "That"} was copied to the clipboard.`,
+};
+
+// DiscoverView.vue specific constants
+// Used in: DiscoverView.vue (searchAll method - search error)
+export const NOTIFY_DISCOVER_SEARCH_ERROR = {
+  title: "Error",
+  message: "There was an error with the search.",
+};
+
+// Used in: DiscoverView.vue (searchLocal method - local search error)
+export const NOTIFY_DISCOVER_LOCAL_SEARCH_ERROR = {
+  title: "Error",
+  message: "There was an error with the local search.",
+};
+
+// Used in: DiscoverView.vue (requestTiles method - map search error)
+export const NOTIFY_DISCOVER_MAP_SEARCH_ERROR = {
+  title: "Error",
+  message: "There was an error with the map search.",
 };