feat: complete Priority 1 type safety improvements

- Fix remaining any types in test apps (Android, iOS, shared TypeScript)
- Replace non-null assertions with proper null checks
- Improve type safety in EndorserAPIClient and TimeSafariNotificationManager
- Enhanced error handling with explicit null checks

Linting status: ✅ 0 errors, 329 warnings (down from 436 warnings)
Priority 1 improvements: 107 warnings fixed (25% reduction)
Type safety: 34 fewer any types, 10 non-null assertions fixed

src/definitions.ts

@@ -243,7 +243,7 @@ export interface UserNotificationConfig {
   badge?: boolean;
   actions?: NotificationAction[];
   category?: string;
-  userInfo?: Record<string, any>;
+  userInfo?: Record<string, unknown>;
 }
 
 export interface NotificationAction {
@@ -271,7 +271,7 @@ export interface ContentFetchResult {
   contentAge: number;
   error?: string;
   retryCount: number;
-  metadata?: Record<string, any>;
+  metadata?: Record<string, unknown>;
 }
 
 export interface DualScheduleStatus {
@@ -358,7 +358,7 @@ export interface DailyNotificationPlugin {
   resumeDualSchedule(): Promise<void>;
   
   // Content management methods
-  getContentCache(): Promise<Record<string, any>>;
+  getContentCache(): Promise<Record<string, unknown>>;
   clearContentCache(): Promise<void>;
   getContentHistory(): Promise<ContentFetchResult[]>;
   
@@ -415,7 +415,7 @@ export interface OfferSummaryRecord {
   amountGivenConfirmed: number;
   objectDescription: string;
   validThrough?: string;
-  fullClaim?: Record<string, any>;
+  fullClaim?: Record<string, unknown>;
 }
 
 export interface OffersToPlansResponse {
@@ -443,7 +443,7 @@ export interface PlansLastUpdatedResponse {
 
 export interface PlanSummaryWithPreviousClaim {
   plan: PlanSummary;
-  wrappedClaimBefore?: Record<string, any>;
+  wrappedClaimBefore?: Record<string, unknown>;
 }
 
 export interface PlanSummary {
@@ -507,7 +507,7 @@ export interface TimeSafariProjectNotification {
   project: PlanSummary;
   changes?: {
     fields: string[];
-    previousValues?: Record<string, any>;
+    previousValues?: Record<string, unknown>;
   };
   relevantOffers?: OfferSummaryRecord[];
   notificationPriority: 'high' | 'medium' | 'low';
@@ -519,7 +519,7 @@ export interface TimeSafariPersonNotification {
   personDid: string;
   changes?: {
     fields: string[];
-    previousValues?: Record<string, any>;
+    previousValues?: Record<string, unknown>;
   };
   relevantProjects?: PlanSummary[];
   notificationPriority: 'high' | 'medium' | 'low';
@@ -531,7 +531,7 @@ export interface TimeSafariItemNotification {
   itemId: string;
   changes?: {
     fields: string[];
-    previousValues?: Record<string, any>;
+    previousValues?: Record<string, unknown>;
   };
   relevantContext?: 'project' | 'offer' | 'person';
   notificationPriority: 'high' | 'medium' | 'low';