Fix `HomeSidebar` repositories navigation — radicle-desktop

TIL that svelte5 reactivity doesn’t apply to destructured renamed variables.

By renaming repos: initialRepos and then using initialRepos in a $state rune, changes to the repos prop will not be taken into account.

   }
   /* eslint-disable prefer-const */
   let {
     config,
     repos: initialRepos,
     notificationCount,
     repoCount,
     activeTab,
   }: Props =
   let { config, repos, notificationCount, repoCount, activeTab }: Props =
     /* eslint-enable prefer-const */
     $props();
   let repos = $state(initialRepos);
   let lock = false;
   const startup = $state<{ error?: ErrorWrapper }>({ error: undefined });