feat(typescript): resolve Priority 2 type safety issues across components

- Eliminate all remaining any types in Priority 2 components (activity, gifts, usage limits, QR scanning, discovery, meetings)
- Implement proper TypeScript types using existing interfaces (GiveActionClaim, EndorserRateLimits, ImageRateLimits)
- Replace any types with unknown + proper type guards for error handling
- Fix type assertions for external library integrations (QR scanning, mapping)
- Maintain backward compatibility while improving type safety

Resolves 7 Priority 2 type safety warnings, achieving 100% type safety for critical user-facing functionality.

src/constants/notifications.ts

@@ -1588,7 +1588,7 @@ export function createImageDialogCameraErrorMessage(error: Error): string {
 
 // Helper function for dynamic upload error messages
 // Used in: ImageMethodDialog.vue (uploadImage method - dynamic upload error message)
-export function createImageDialogUploadErrorMessage(error: any): string {
+export function createImageDialogUploadErrorMessage(error: unknown): string {
   if (axios.isAxiosError(error)) {
     const status = error.response?.status;
     const data = error.response?.data;