refactor(missions): render comms body with lexical-content class

Replaces inline prose utility stack with the shared lexical-content class from the rich text editor work.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/components/frontend/intelligence/MissionComms.tsx

@@ -65,7 +65,7 @@ export function MissionComms({ commsAndDocs }: MissionCommsProps) {
               <span className="text-xs font-semibold uppercase tracking-wider text-muted-foreground">
                 Radio Plan
               </span>
-              <div className="text-sm text-muted-foreground leading-relaxed prose-invert prose-sm max-w-none [&_p]:mb-2 [&_ul]:list-disc [&_ul]:ml-4 [&_ol]:list-decimal [&_ol]:ml-4 [&_strong]:text-foreground [&_em]:italic">
+              <div className="lexical-content">
                 <RichText data={radioPlan} />
               </div>
             </div>