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Implement distributed tracing across edge functions:
- Introduce span types and utilities (logger.ts enhancements)
- Replace request tracking with span-based tracing in approval and rejection flows
- Propagate and manage W3C trace context in edge tracking
- Add span visualization scaffolding (spanVisualizer.ts) and admin TraceViewer UI (TraceViewer.tsx)
- Create tracing-related type definitions and support files
- Prepare RPC call logging with span context and retries

src/types/tracing.ts

@@ -0,0 +1,35 @@
+/**
+ * Distributed Tracing Types
+ * Mirrors the types defined in edge function logger
+ */
+
+export interface Span {
+  spanId: string;
+  traceId: string;
+  parentSpanId?: string;
+  name: string;
+  kind: 'SERVER' | 'CLIENT' | 'INTERNAL' | 'DATABASE';
+  startTime: number;
+  endTime?: number;
+  duration?: number;
+  attributes: Record<string, unknown>;
+  events: SpanEvent[];
+  status: 'ok' | 'error' | 'unset';
+  error?: {
+    type: string;
+    message: string;
+    stack?: string;
+  };
+}
+
+export interface SpanEvent {
+  timestamp: number;
+  name: string;
+  attributes?: Record<string, unknown>;
+}
+
+export interface SpanContext {
+  traceId: string;
+  spanId: string;
+  traceFlags?: number;
+}