fix: harden identity, live access, drafts and setup (review only)

Source-reviewed hardening changes and regression tests. UNBUILT / UNTESTED: not a deployable release. Go formatting, compilation, automated regression tests, full frontend validation and staging acceptance remain required. See docs/hardening/VALIDATION.md. Main remains the original clean snapshot; no upstream Git history imported.

web/components/support-chat/close-navigation.ts

@@ -1,5 +1,16 @@
+// Modified in the independent hardening fork; see docs/hardening/README.md.
 export const SUPPORT_CHAT_CLOSED_PATH = "/support/chat/closed"
 
-export function getStandaloneClosedUrl() {
-  return SUPPORT_CHAT_CLOSED_PATH
+// Keep the entry context when dismissing/returning. These are always local
+// paths, never a caller-supplied redirect destination.
+function querySuffix(search: string) {
+  return search ? `?${new URLSearchParams(search).toString()}` : ""
+}
+
+export function getStandaloneClosedUrl(search = "") {
+  return `${SUPPORT_CHAT_CLOSED_PATH}${querySuffix(search)}`
+}
+
+export function getStandaloneChatUrl(search = "") {
+  return `/support/chat${querySuffix(search)}`
 }