Expose persistent collection gaps and public Congress links

Retain bill and attachment failure reasons and derive retry counts from saved cursors. Show gap details and retry exhaustion in the collection console while preserving historical records and retry limits.

Convert Congress API bill links to public pages and cover diagnostics, mixed dated versions, persistent counts and legacy records with regression tests.

web/src/common/apis/crawler/type.ts

@@ -19,7 +19,13 @@ export interface SourceInfo {
   paused_until: string | null
   collection_stats?: Record<string, number>
   configuration_error?: string | null
-  history_cursor?: { history?: { scanned?: boolean }, realtime?: { entry: number } }
+  history_cursor?: {
+    history?: { scanned?: boolean }
+    realtime?: { entry: number }
+    document_retries?: Record<string, CollectionRetry>
+    attachment_retries?: Record<string, CollectionRetry>
+    bill_retries?: Record<string, CollectionRetry>
+  }
   supports_history: boolean
   history_target: string | null
   history_position: string | null
@@ -30,6 +36,13 @@ export interface SourceInfo {
   total_items: number
 }
 
+export interface CollectionRetry {
+  document: { url: string, canonical?: string }
+  attempts: number
+  next_at: number
+  error?: string
+}
+
 export interface SourcesInfo {
   manager_alive: boolean
   db_size_bytes: number