UI: secrets-aware env editor, issue hiding, and adapter env bindings

Replace plain text env var editor with structured EnvVarEditor
supporting plain values and secret references with inline "Seal"
to convert a value to a managed secret. Add issue hide action via
popover menu on issue detail. Adapters now emit envBindings with
typed plain/secret_ref entries instead of raw KEY=VALUE strings.

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

ui/src/lib/queryKeys.ts

@@ -37,6 +37,10 @@ export const queryKeys = {
     comments: (approvalId: string) => ["approvals", "comments", approvalId] as const,
     issues: (approvalId: string) => ["approvals", "issues", approvalId] as const,
   },
+  secrets: {
+    list: (companyId: string) => ["secrets", companyId] as const,
+    providers: (companyId: string) => ["secret-providers", companyId] as const,
+  },
   dashboard: (companyId: string) => ["dashboard", companyId] as const,
   sidebarBadges: (companyId: string) => ["sidebar-badges", companyId] as const,
   activity: (companyId: string) => ["activity", companyId] as const,