feat: Display a toast notification after library migration, powered by new migration status in the API response.

src/app/api/migrations/v1/route.ts

@@ -114,8 +114,8 @@ export async function POST(request: NextRequest) {
       }
     }
 
-    await ensureDocumentsV1Ready();
-    await ensureAudiobooksV1Ready();
+    const documentsMigrated = await ensureDocumentsV1Ready();
+    const audiobooksMigrated = await ensureAudiobooksV1Ready();
     const rekey = await rekeyAudiobooksV1(mappings);
 
     const documentsReady = await isDocumentsV1Ready();
@@ -125,6 +125,8 @@ export async function POST(request: NextRequest) {
       success: true,
       documentsReady,
       audiobooksReady,
+      documentsMigrated,
+      audiobooksMigrated,
       rekey,
     });
   } catch (error) {

src/contexts/ConfigContext.tsx

@@ -103,11 +103,31 @@ export function ConfigProvider({ children }: { children: ReactNode }) {
 
         // Run server-side v1 migrations proactively, since the client may now
         // reference SHA-based IDs immediately after the Dexie migration.
-        await fetch('/api/migrations/v1', {
+        const response = await fetch('/api/migrations/v1', {
           method: 'POST',
           headers: { 'Content-Type': 'application/json' },
           body: JSON.stringify({ mappings }),
-        }).catch(() => undefined);
+        }).catch(() => null);
+
+        if (response?.ok) {
+          const data = await response.json();
+          const didMigrate =
+            data.documentsMigrated ||
+            data.audiobooksMigrated ||
+            (data.rekey?.renamed ?? 0) > 0 ||
+            (data.rekey?.merged ?? 0) > 0;
+
+          if (didMigrate) {
+            toast.success('Library migration complete', {
+              duration: 5000,
+              icon: '📦',
+              style: {
+                background: 'var(--offbase)',
+                color: 'var(--foreground)',
+              },
+            });
+          }
+        }
       } catch (error) {
         console.warn('Startup migrations failed:', error);
       }

src/lib/server/docstore.ts

@@ -101,18 +101,18 @@ function safeDocumentName(rawName: string, fallback: string): string {
   return baseName.replaceAll('\u0000', '').slice(0, 240) || fallback;
 }
 
-export async function ensureDocumentsV1Ready(): Promise<void> {
+export async function ensureDocumentsV1Ready(): Promise<boolean> {
   await mkdir(DOCSTORE_DIR, { recursive: true });
   await mkdir(DOCUMENTS_V1_DIR, { recursive: true });
 
   const state = await loadMigrationState();
   if (state.documentsV1Migrated && !(await hasLegacyDocumentFiles())) {
-    return;
+    return false;
   }
 
   if (!(await hasLegacyDocumentFiles())) {
     await saveMigrationState({ documentsV1Migrated: true });
-    return;
+    return false;
   }
 
   let entries: Array<import('fs').Dirent> = [];
@@ -165,6 +165,7 @@ export async function ensureDocumentsV1Ready(): Promise<void> {
   }
 
   await saveMigrationState({ documentsV1Migrated: !(await hasLegacyDocumentFiles()) });
+  return true;
 }
 
 async function hasLegacyAudiobookDirs(): Promise<boolean> {
@@ -269,7 +270,7 @@ async function mergeDirectoryContents(sourceDir: string, targetDir: string): Pro
   return { moved, skipped };
 }
 
-export async function ensureAudiobooksV1Ready(): Promise<void> {
+export async function ensureAudiobooksV1Ready(): Promise<boolean> {
   await mkdir(DOCSTORE_DIR, { recursive: true });
   await mkdir(AUDIOBOOKS_V1_DIR, { recursive: true });
 
@@ -284,7 +285,7 @@ export async function ensureAudiobooksV1Ready(): Promise<void> {
     if (hasExtraKeys) {
       await saveMigrationState({ audiobooksV1Migrated: true });
     }
-    return;
+    return false;
   }
 
   let entries: Array<import('fs').Dirent> = [];
@@ -333,6 +334,7 @@ export async function ensureAudiobooksV1Ready(): Promise<void> {
   const finalLegacyRemaining = await hasLegacyAudiobookDirs();
   const finalLegacyChaptersRemaining = await hasLegacyAudiobookChapterLayout();
   await saveMigrationState({ audiobooksV1Migrated: !finalLegacyRemaining && !finalLegacyChaptersRemaining });
+  return true;
 }
 
 type LegacyChapterMeta = {