fix(workshop): keep download progress across tab switches

The workshop is unmounted when the Installed tab is opened, so its local download state was discarded and returning to the Community tab showed no progress even though the install was still running. Active downloads and percentages now live in a shared module that outlives the component, and in-flight downloads keep updating it.

src/lib/communityThemeDownloads.ts

@@ -0,0 +1,10 @@
+import { SvelteMap, SvelteSet } from 'svelte/reactivity';
+
+/**
+ * Install progress lives outside the workshop component because switching to
+ * the Installed tab unmounts it. Keeping the state here lets the workshop show
+ * the current progress again when it is remounted, while the in-flight
+ * download keeps running.
+ */
+export const activeThemeDownloads = new SvelteSet<string>();
+export const themeDownloadProgress = new SvelteMap<string, number>();

src/lib/components/theme/CommunityWorkshopView.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
   import DefaultThemePreview from '$assets/default_preview.png';
+  import { activeThemeDownloads, themeDownloadProgress } from '$lib/communityThemeDownloads';
   import {
     fetchCommunityTags,
     fetchCommunityThemes,
@@ -84,7 +85,7 @@
   } from '@lucide/svelte';
   import { sileo } from 'sileo';
   import { onMount } from 'svelte';
-  import { SvelteMap, SvelteSet } from 'svelte/reactivity';
+  import { SvelteMap } from 'svelte/reactivity';
 
   let {
     onApplyTheme,
@@ -119,8 +120,6 @@
   let error = $state<string | null>(null);
   let latestRequestId = 0;
 
-  let downloadingIds = new SvelteSet<string>();
-  let downloadProgressById = new SvelteMap<string, number>();
   let forkingId = $state<string | null>(null);
   let deletingId = $state<string | null>(null);
   let moderatingId = $state<string | null>(null);
@@ -415,14 +414,14 @@
   }
 
   async function handleDownloadTheme(theme: CommunityTheme) {
-    if (theme.deletedAt || downloadingIds.has(theme.id)) return;
+    if (theme.deletedAt || activeThemeDownloads.has(theme.id)) return;
 
-    downloadingIds.add(theme.id);
+    activeThemeDownloads.add(theme.id);
-    downloadProgressById.set(theme.id, 10);
+    themeDownloadProgress.set(theme.id, 10);
 
     try {
       await downloadAndInstallCommunityTheme(theme, (_status, progress) => {
-        downloadProgressById.set(theme.id, progress);
+        themeDownloadProgress.set(theme.id, progress);
       });
 
       sileo.success({
@@ -436,8 +435,8 @@
         description: err instanceof Error ? err.message : String(err),
       });
     } finally {
-      downloadingIds.delete(theme.id);
+      activeThemeDownloads.delete(theme.id);
-      downloadProgressById.delete(theme.id);
+      themeDownloadProgress.delete(theme.id);
     }
   }
 
@@ -458,18 +457,24 @@
   }
 
   async function handleEditTheme(theme: CommunityTheme) {
-    if (theme.deletedAt || downloadingIds.has(theme.id) || forkingId || deletingId || moderatingId)
+    if (
+      theme.deletedAt ||
+      activeThemeDownloads.has(theme.id) ||
+      forkingId ||
+      deletingId ||
+      moderatingId
+    )
       return;
 
     let installed =
       localThemeMap.get(theme.id.toLowerCase()) || localThemeMap.get(theme.name.toLowerCase());
 
     if (!installed) {
-      downloadingIds.add(theme.id);
+      activeThemeDownloads.add(theme.id);
-      downloadProgressById.set(theme.id, 10);
+      themeDownloadProgress.set(theme.id, 10);
       try {
         await downloadAndInstallCommunityTheme(theme, (_status, progress) => {
-          downloadProgressById.set(theme.id, progress);
+          themeDownloadProgress.set(theme.id, progress);
         });
         installed = $custom_themes.find(
           (candidate) => candidate.folder_name.toLowerCase() === theme.id.toLowerCase()
@@ -481,8 +486,8 @@
         });
         return;
       } finally {
-        downloadingIds.delete(theme.id);
+        activeThemeDownloads.delete(theme.id);
-        downloadProgressById.delete(theme.id);
+        themeDownloadProgress.delete(theme.id);
       }
     }
 
@@ -492,7 +497,13 @@
   }
 
   async function handleRefreshOwnedTheme(theme: CommunityTheme) {
-    if (theme.deletedAt || downloadingIds.has(theme.id) || forkingId || deletingId || moderatingId)
+    if (
+      theme.deletedAt ||
+      activeThemeDownloads.has(theme.id) ||
+      forkingId ||
+      deletingId ||
+      moderatingId
+    )
       return;
 
     const installed =
@@ -511,11 +522,11 @@
     );
     if (!confirmed) return;
 
-    downloadingIds.add(theme.id);
+    activeThemeDownloads.add(theme.id);
-    downloadProgressById.set(theme.id, 10);
+    themeDownloadProgress.set(theme.id, 10);
     try {
       const res = await downloadAndInstallCommunityTheme(theme, (_status, progress) => {
-        downloadProgressById.set(theme.id, progress);
+        themeDownloadProgress.set(theme.id, progress);
       });
       const refreshed = $custom_themes.find(
         (candidate) => candidate.folder_name.toLowerCase() === res.folderName.toLowerCase()
@@ -534,8 +545,8 @@
         description: err instanceof Error ? err.message : String(err),
       });
     } finally {
-      downloadingIds.delete(theme.id);
+      activeThemeDownloads.delete(theme.id);
-      downloadProgressById.delete(theme.id);
+      themeDownloadProgress.delete(theme.id);
     }
   }
 
@@ -732,10 +743,10 @@
     let installed: Theme | undefined;
     try {
       await loadWorkshopThemes();
-      downloadingIds.add(fork.id);
+      activeThemeDownloads.add(fork.id);
-      downloadProgressById.set(fork.id, 10);
+      themeDownloadProgress.set(fork.id, 10);
       const res = await downloadAndInstallCommunityTheme(fork, (_status, progress) => {
-        downloadProgressById.set(fork.id, progress);
+        themeDownloadProgress.set(fork.id, progress);
       });
       installed = $custom_themes.find(
         (candidate) => candidate.folder_name.toLowerCase() === res.folderName.toLowerCase()
@@ -746,8 +757,8 @@
         description: `${err instanceof Error ? err.message : String(err)} You can download it from the workshop.`,
       });
     } finally {
-      downloadingIds.delete(fork.id);
+      activeThemeDownloads.delete(fork.id);
-      downloadProgressById.delete(fork.id);
+      themeDownloadProgress.delete(fork.id);
     }
 
     if (installed) {
@@ -1600,8 +1611,8 @@
               {@const isActive = Boolean(
                 localTheme && $active_custom_theme?.folder_name === localTheme.folder_name
               )}
-              {@const isDownloading = downloadingIds.has(theme.id)}
+              {@const isDownloading = activeThemeDownloads.has(theme.id)}
-              {@const downloadPercent = downloadProgressById.get(theme.id) ?? 0}
+              {@const downloadPercent = themeDownloadProgress.get(theme.id) ?? 0}
               {@const isDeleted = Boolean(theme.deletedAt)}
               {@const hasUpdate = Boolean(
                 !isDeleted && localTheme && localTheme.version !== theme.version