Fix local node tooltip in the Sidebar — radicle-explorer

Also changes the ContextHelp from Device to Local node, seems more explicit.

             <Button
               stylePadding="0 0.75rem"
               variant="background"
               title="Help"
               title="Local node"
               slot="toggle"
               let:toggle
               on:click={toggle}>

 <div class="help" class:popover>
   {#if $httpdStore.state === "stopped"}
     <div class="title txt-bold">Device not connected</div>
     <div class="title txt-bold">Local node not connected</div>
     <div>Click the Connect button in the top right corner to get started.</div>
   {:else if localProject === "notFound"}
     <div class="title txt-bold">Project not available locally</div>