chore(approval): tighten allow_permanent comments + DRY the no-always opt set

Collapse the verbose multi-line rationale comments across the TUI/desktop/
backend approval surfaces into single-line "why" notes, and derive
APPROVAL_OPTS_NO_ALWAYS from APPROVAL_OPTS instead of re-listing it.
No behavior change.

ui-tui/src/app/createGatewayEventHandler.ts

@@ -728,8 +728,7 @@ export function createGatewayEventHandler(ctx: GatewayEventHandlerContext): (ev:
         return
       case 'approval.request': {
         const description = String(ev.payload.description ?? 'dangerous command')
-        // Backend omits the field for the common case; only an explicit false
-        // (tirith warning present) drops the permanent-allow option.
+        // Only an explicit false (tirith warning) drops the permanent-allow option.
         const allowPermanent = ev.payload.allow_permanent !== false
 
         patchOverlayState({