Add notification utility helpers and update PlatformServiceMixin

Created notification utility approaches to consolidate verbose $notify calls:
- Simple function utility (src/utils/notify.ts) - recommended approach
- Vue 3 composable (src/composables/useNotifications.ts)
- Utility class with mixin (src/utils/notificationUtils.ts)

Updated ClaimView.vue to demonstrate usage, reducing notification code by ~70%.
Enhanced PlatformServiceMixin with improved caching and database methods.
Updated ShareMyContactInfoView.vue with mixin improvements.
Provides consistent timeouts, standardized patterns, and type safety.
Ready for migration alongside mixin updates.

src/utils/PlatformServiceMixin.ts

@@ -545,8 +545,8 @@ export const PlatformServiceMixin = {
 
     /**
      * Load all contacts with caching - $contacts()
-     * Ultra-concise shortcut with 60s TTL for performance
-     * @returns Cached mapped array of all contacts
+     * Contacts are cached for 60 seconds for performance
+     * @returns Promise<Contact[]> Array of contact objects
      */
     async $contacts(): Promise<Contact[]> {
       const cacheKey = "contacts_all";
@@ -565,6 +565,16 @@ export const PlatformServiceMixin = {
       );
     },
 
+    /**
+     * Get total contact count - $contactCount()
+     * Ultra-concise shortcut for getting number of contacts
+     * @returns Promise<number> Total number of contacts
+     */
+    async $contactCount(): Promise<number> {
+      const countRow = await this.$one("SELECT COUNT(*) FROM contacts");
+      return (countRow?.[0] as number) || 0;
+    },
+
     /**
      * Load settings with optional defaults WITHOUT caching - $settings()
      * Settings are loaded fresh every time for immediate consistency
@@ -1136,6 +1146,7 @@ export interface IPlatformServiceMixin {
   $insertContact(contact: Partial<Contact>): Promise<boolean>;
   $updateContact(did: string, changes: Partial<Contact>): Promise<boolean>;
   $getAllContacts(): Promise<Contact[]>;
+  $contactCount(): Promise<number>;
   $insertEntity(
     tableName: string,
     entity: Record<string, unknown>,
@@ -1211,6 +1222,7 @@ declare module "@vue/runtime-core" {
 
     // Specialized shortcuts - contacts cached, settings fresh
     $contacts(): Promise<Contact[]>;
+    $contactCount(): Promise<number>;
     $settings(defaults?: Settings): Promise<Settings>;
     $accountSettings(did?: string, defaults?: Settings): Promise<Settings>;