dashboard: drop the approvals queue

Y3R C4LL is the operator inbox alone: no P3NDING APPR0VALS section, no
approval cards or history, no approval_resolved subscription, no
approval browser notifications, and the tab count and title prefix count
unread operator messages only. The H0M3 tile text drops "approvals".

The deny form was the only data-prompt form, so bindAsyncForms' prompt
branch, themedPrompt and its dialog styles go too, along with the
approval-only CSS (.approval*, .approvals-history, .btn-deny, the
status/glyph colours and .history-note).

frontend/packages/shared/src/terminal/terminal.js

@@ -509,7 +509,7 @@ export function create(opts) {
         // Seq-dedupe only events of a kind that actually appeared in
         // the history replay — those are the only ones that could
         // double (once via history, once via the live buffer).
-        // Mutation events (approval/container/…) are never
+        // Mutation events (container/transient/…) are never
         // carried by the history endpoint; deduping them against the
         // broker-history seq would wrongly drop ones that fired
         // between a consumer's own snapshot read and this history