feat(sdk): P4.5 @insignia/iios-support-web (composes message-web + support REST)

SupportProvider (wraps MessageProvider + support client); useEscalate, useTickets/
useAssignedTickets (+createTicket/patch), useCallbackRequest, useAvailability;
re-exports useThread/useMessages. Boundary allowlist: support-web -> contracts+
kernel-client+message-web+inbox-web.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pnpm-lock.yaml

@@ -181,6 +181,28 @@ importers:
         specifier: ^5.7.3
         version: 5.9.3
 
+  packages/iios-support-web:
+    dependencies:
+      '@insignia/iios-kernel-client':
+        specifier: workspace:*
+        version: link:../iios-kernel-client
+      '@insignia/iios-message-web':
+        specifier: workspace:*
+        version: link:../iios-message-web
+    devDependencies:
+      '@types/react':
+        specifier: ^19.0.0
+        version: 19.2.17
+      react:
+        specifier: ^19.0.0
+        version: 19.2.7
+      tsup:
+        specifier: ^8.3.5
+        version: 8.5.1(jiti@2.7.0)(postcss@8.5.16)(typescript@5.9.3)
+      typescript:
+        specifier: ^5.7.3
+        version: 5.9.3
+
   packages/iios-testkit:
     dependencies:
       '@insignia/iios-contracts':