feat(bridge-monitoring): show inventory shortfall for queued releases

Surface mission-control bridge_inventory scope, wei shortfall fields, and
relay card formatting for WETH display.

Made-with: Cursor

frontend/src/components/explorer/BridgeMonitoringPage.tsx

@@ -25,6 +25,11 @@ interface RelayLaneCard {
   failed: number
   lastPolled: string
   bridgeAddress: string
+  issueScope: string | null
+  issueMessage: string | null
+  inventoryShortfallWei: string | null
+  inventoryRequiredWei: string | null
+  inventoryAvailableWei: string | null
 }
 
 const relayOrder = ['mainnet_cw', 'mainnet_weth', 'bsc', 'avax', 'avax_cw', 'avax_to_138']
@@ -53,6 +58,9 @@ function resolveSnapshot(relay?: MissionControlRelayPayload): MissionControlRela
 
 function relayPolicyCue(snapshot: MissionControlRelaySnapshot | null): string | null {
   if (!snapshot) return null
+  if (snapshot.last_error?.scope === 'bridge_inventory') {
+    return 'Queued release waiting on bridge inventory'
+  }
   if (String(snapshot.status || '').toLowerCase() === 'paused' && snapshot.monitoring?.delivery_enabled === false) {
     return 'Delivery disabled by policy'
   }
@@ -81,6 +89,18 @@ function statusPillClasses(status: string): string {
   return 'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/50 dark:text-emerald-100'
 }
 
+function formatWeiToToken(value?: string | null): string {
+  if (!value) return 'Unknown'
+  try {
+    const raw = BigInt(value)
+    const whole = raw / 10n ** 18n
+    const fractional = (raw % 10n ** 18n).toString().padStart(18, '0').slice(0, 6).replace(/0+$/, '')
+    return fractional ? `${whole.toString()}.${fractional}` : whole.toString()
+  } catch {
+    return value
+  }
+}
+
 function ActionLink({
   href,
   label,
@@ -171,7 +191,7 @@ export default function BridgeMonitoringPage({
         return {
           key,
           label: getMissionControlRelayLabel(key),
-          status,
+          status: snapshot?.last_error?.scope === 'bridge_inventory' ? 'underfunded' : status,
           profile: snapshot?.service?.profile || key,
           sourceChain: snapshot?.source?.chain_name || 'Unknown',
           destinationChain: snapshot?.destination?.chain_name || 'Unknown',
@@ -184,6 +204,11 @@ export default function BridgeMonitoringPage({
             snapshot?.destination?.relay_bridge ||
             snapshot?.source?.bridge_filter ||
             '',
+          issueScope: snapshot?.last_error?.scope || null,
+          issueMessage: snapshot?.last_error?.message || null,
+          inventoryShortfallWei: snapshot?.last_error?.shortfall || null,
+          inventoryRequiredWei: snapshot?.last_error?.required_amount || null,
+          inventoryAvailableWei: snapshot?.last_error?.available_amount || null,
         }
       })
       .sort((left, right) => {
@@ -313,6 +338,17 @@ export default function BridgeMonitoringPage({
                 {relayPolicyCue(resolveSnapshot((getMissionControlRelays(bridgeStatus) || {})[lane.key]))}
               </div>
             ) : null}
+            {lane.issueScope === 'bridge_inventory' ? (
+              <div className="mt-3 rounded-2xl border border-amber-200 bg-amber-50/80 p-3 text-sm text-amber-950 dark:border-amber-900/60 dark:bg-amber-950/30 dark:text-amber-100">
+                <div className="font-semibold">Bridge inventory below required release amount</div>
+                <div className="mt-1">
+                  Shortfall: {formatWeiToToken(lane.inventoryShortfallWei)} WETH
+                </div>
+                <div className="mt-1 text-xs opacity-80">
+                  Required: {formatWeiToToken(lane.inventoryRequiredWei)} WETH · Available: {formatWeiToToken(lane.inventoryAvailableWei)} WETH
+                </div>
+              </div>
+            ) : null}
           </Card>
         ))}
       </div>

frontend/src/services/api/missionControl.ts

@@ -16,6 +16,16 @@ export interface MissionControlRelayItemSummary {
 
 export interface MissionControlRelaySnapshot {
   status?: string
+  last_error?: {
+    scope?: string
+    message?: string
+    message_id?: string
+    target_bridge?: string
+    token?: string
+    available_amount?: string
+    required_amount?: string
+    shortfall?: string
+  }
   monitoring?: {
     delivery_enabled?: boolean
     shedding?: boolean
@@ -135,6 +145,11 @@ function relativeAge(isoString?: string): string {
 }
 
 function describeRelayStatus(snapshot: MissionControlRelaySnapshot, status: string): string {
+  if (snapshot.last_error?.scope === 'bridge_inventory') {
+    return snapshot.queue?.size && snapshot.queue.size > 0
+      ? 'underfunded queued release'
+      : 'underfunded release'
+  }
   if (status === 'paused' && snapshot.monitoring?.delivery_enabled === false) {
     return snapshot.queue?.size && snapshot.queue.size > 0 ? 'delivery paused (queueing)' : 'delivery paused'
   }