Improve moderation edge flow and timeout handling

- Add early logging and health check to process-selective-approval edge function
- Implement idempotency check with timeout to avoid edge timeouts
- Expose health endpoint for connectivity diagnostics
- Increase client moderation action timeout from 30s to 60s
- Update moderation actions hook to accommodate longer timeouts

src/hooks/moderation/useModerationActions.ts

@@ -86,7 +86,7 @@ export function useModerationActions(config: ModerationActionsConfig): Moderatio
     itemIds: string[],
     userId?: string,
     maxConflictRetries: number = 3,
-    timeoutMs: number = 30000
+    timeoutMs: number = 60000 // Increased from 30s to 60s
   ): Promise<{
     data: T | null;
     error: any;
@@ -337,7 +337,7 @@ export function useModerationActions(config: ModerationActionsConfig): Moderatio
               submissionItems.map((i) => i.id),
               config.user?.id,
               3, // Max 3 conflict retries
-              30000 // 30s timeout
+              60000 // 60s timeout (increased for slow queries)
             );
             
             // Log retry attempts
@@ -393,7 +393,7 @@ export function useModerationActions(config: ModerationActionsConfig): Moderatio
               submissionItems.map((i) => i.id),
               config.user?.id,
               3, // Max 3 conflict retries
-              30000 // 30s timeout
+              60000 // 60s timeout (increased for slow queries)
             );
             
             // Log retry attempts