Last-mile typecheck sweep: 3 small bugs

- GuideToolOngoingView classNames clause: classNames(..., 'chat.roomId'
  && 'cursor-pointer') — the property name was quoted so the literal
  string 'chat.roomId' was always-truthy. Unquote to read the actual
  chat.roomId field.
- NavigatorRoomSettingsModTabView: UserProfileIconView userName={ user.userId }
  put a number into the string-typed userName prop; the right prop for
  a numeric id is userId.
- WiredExtraVariableEchoView resolvedVariableEntries: the inline
  fallback-entry literal at the bottom of the useMemo got its kind
  field widened to string (instead of the 'custom' literal needed by
  IWiredVariablePickerEntry). Lift it into a typed const + rename to
  namedFallback to avoid the shadowing of the upstream
  createFallbackVariableEntry result.

src/components/guide-tool/views/GuideToolOngoingView.tsx

@@ -101,7 +101,7 @@ export const GuideToolOngoingView: FC<GuideToolOngoingViewProps> = props =>
                                         { (isOwnChat(group.userId)) && GetSessionDataManager().userName }
                                         { (!isOwnChat(group.userId)) && userName }
                                     </Text>
-                                    { group.messages.map((chat, index) => <div key={ index } className={ classNames(chat.roomId ? 'text-break text-underline' : 'text-break', 'chat.roomId' && 'cursor-pointer') } onClick={ () => chat.roomId ? TryVisitRoom(chat.roomId) : null }>{ chat.message }</div>) }
+                                    { group.messages.map((chat, index) => <div key={ index } className={ classNames(chat.roomId ? 'text-break text-underline' : 'text-break', chat.roomId && 'cursor-pointer') } onClick={ () => chat.roomId ? TryVisitRoom(chat.roomId) : null }>{ chat.message }</div>) }
                                 </div>
                                 { (isOwnChat(group.userId)) &&
                                     <div className="shrink-0 message-avatar">