fix(WP-0014/A2): continued type-correctness fixes and Tailwind CSS output

- Schema.sql: add FK constraints for phases 6–12 so IHP generates Id X
  instead of UUID for FK columns (widget_adapter_specs, friction_scores,
  hub_routing_rules, agent_proposals, hub_capability_manifests, etc.)
- HubHealth, ModelRouter, ApiInteractionEvents: remove toUUID() wrappers
  now that FK columns carry proper Id types
- FederatedGovernance/Dashboard, HubRoutingRules/Index: same Id comparison fix
- AgentProposals/Index, DecisionRecords/Index, ApiConsumers/Edit: Id type fixes
- BottleneckDetector: add Data.Coerce import; CrossHubPropagation: add guard
- ApiKeys: qualify cryptohash-sha256 import to resolve package ambiguity
- WebhookDeliveryJob: use LBS.fromStrict; remove duplicate diffUTCTime
- Sessions/New: use renderFlashMessages (IHP built-in)
- ArchiveRecords/LineageInspector: simplify renderChainStep signature
- static/app.css: Tailwind CSS output (2011 lines) — A3 confirmed
- workplans/IHUB-WP-0015-local-deployment-intro-ui.md: add workplan

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Web/Job/WebhookDeliveryJob.hs

@@ -52,7 +52,7 @@ attempt sub payload attemptNo = do
                  $ HTTP.setRequestHeader "Content-Type" ["application/json"]
                  $ HTTP.setRequestHeader "X-IHF-Signature" [TE.encodeUtf8 sig]
                  $ HTTP.setRequestHeader "X-IHF-Event" [TE.encodeUtf8 sub.eventType]
-                 $ HTTP.setRequestBodyBS payloadBytes req
+                 $ HTTP.setRequestBodyLBS (LBS.fromStrict payloadBytes) req
         HTTP.httpLBS req'
     endTime <- getCurrentTime
     let latencyMs = round (realToFrac (diffUTCTime endTime startTime) * 1000 :: Double) :: Int
@@ -104,5 +104,3 @@ hmacSha256Hex secret payload =
         digest       = SHA256.hash combined
     in TE.decodeUtf8 (Base16.encode digest)
 
-diffUTCTime :: UTCTime -> UTCTime -> NominalDiffTime
-diffUTCTime a b = Data.Time.diffUTCTime a b