Improve application responsiveness and background processing

src/routes/betas/new/+page.svelte

@@ -176,7 +176,7 @@
 <div class="page">
     <SectionHeader title="New beta" subtitle="Choose exact file versions and test servers, then review before starting.">{#snippet actions()}<Button href="/betas" variant="ghost">Back to betas</Button>{/snippet}</SectionHeader>
     {#if flash}<div class="ui-error" role="alert">{flash}{#if !scripts.length}<Button size="sm" onclick={()=>initialize()}>Retry</Button>{/if}</div>{/if}
-    {#if $fleetError}<div class="ui-error" role="alert">{$fleetError}<Button size="sm" onclick={refreshFleet}>Retry servers</Button></div>{/if}
+    {#if $fleetError}<div class="ui-error" role="alert">{$fleetError}<Button size="sm" onclick={() => refreshFleet(true)}>Retry servers</Button></div>{/if}
     {#if notice}<p role="status" class="notice">{notice}</p>{/if}
     {#if loading}<EmptyState title="Loading beta setup…"/>
     {:else if availableDraft}<section class="ui-panel draft"><h2>Resume unfinished beta?</h2><p>Saved {$timeFormat.dateTime(availableDraft.savedAt)} · {availableDraft.picks.filter(p=>p.scriptId!==null).length} files · {availableDraft.servers.length} selected servers. Versions and eligibility will be rechecked.</p><div class="actions"><Button variant="primary" onclick={resumeDraft}>Resume draft</Button><Button onclick={discardDraft}>{hasLinkedSetup ? 'Discard draft and use linked files' : 'Discard draft'}</Button></div></section>