improved cache cleanup for offline mode

frontend/src/hooks/useOfflineMode.ts

@@ -481,9 +481,24 @@ export function useOfflineMode(
   const deleteOfflineData = useCallback(async () => {
     if (!projectId) return;
 
+    // Get storage keys before deleting (to clear in-memory blob URLs)
+    const assets = discoverAssets();
+    const storageKeys = assets.map((a) => a.storageKey);
+
+    // Clear in-memory blob URLs for this project's assets
+    downloadManager.clearBlobUrlsForKeys(storageKeys);
+
+    // Delete from persistent storage
     await StorageManager.deleteProjectAssets(projectId);
     await OfflineDbManager.deleteProject(projectId);
 
+    // Reset refs used for progress tracking
+    assetsRef.current = [];
+    downloadedCountRef.current = 0;
+    downloadedBytesRef.current = 0;
+
+    // Reset state
+    setDiscoveredAssets([]);
     setProjectInfo(null);
     setStatus('not_downloaded');
     setProgress(0);
@@ -491,7 +506,7 @@ export function useOfflineMode(
     setTotalAssets(0);
     setDownloadedBytes(0);
     setTotalBytes(0);
-  }, [projectId]);
+  }, [projectId, discoverAssets]);
 
   // Check for updates by comparing discovered assets with stored project
   const checkForUpdates = useCallback(async (): Promise<boolean> => {

frontend/src/lib/offline/DownloadManager.ts

@@ -756,6 +756,20 @@ class DownloadManagerClass {
     }
   }
 
+  /**
+   * Clear blob URLs for specific storage keys (call when deleting project offline data)
+   */
+  clearBlobUrlsForKeys(storageKeys: string[]): void {
+    for (const key of storageKeys) {
+      const blobUrl = this.readyBlobUrls.get(key);
+      if (blobUrl) {
+        URL.revokeObjectURL(blobUrl);
+        this.readyBlobUrls.delete(key);
+      }
+      this.partialDownloadsReady.delete(key);
+    }
+  }
+
   /**
    * Check if URL is an image based on extension
    */

frontend/src/lib/offline/StorageManager.ts

@@ -9,6 +9,7 @@ import { OFFLINE_CONFIG } from '../../config/offline.config';
 import { PRELOAD_CONFIG } from '../../config/preload.config';
 import { OfflineDbManager } from '../offlineDb/OfflineDbManager';
 import { extractStoragePath } from '../assetUrl';
+import { logger } from '../logger';
 import type {
   OfflineAsset,
   AssetVariantType,
@@ -260,23 +261,34 @@ export class StorageManager {
     // Delete from IndexedDB
     await OfflineDbManager.deleteProjectAssets(projectId);
 
-    // Cache API cleanup is more complex - we'd need to track URLs
-    // For now, we rely on the service worker to handle this
+    // Delete from Cache API - iterate through cache and delete entries for this project
+    if (typeof caches !== 'undefined') {
+      try {
+        const cache = await caches.open(OFFLINE_CONFIG.cacheNames.assets);
+        const keys = await cache.keys();
+
+        for (const request of keys) {
+          const response = await cache.match(request);
+          if (response) {
+            const cachedProjectId = response.headers.get('X-Project-Id');
+            if (cachedProjectId === projectId) {
+              await cache.delete(request);
+            }
+          }
+        }
+      } catch (error) {
+        logger.error('[StorageManager] Failed to clear Cache API:', error);
+      }
+    }
   }
 
   /**
    * Get total storage used
    */
   static async getTotalStorageUsed(): Promise<number> {
-    let total = 0;
-
-    // IndexedDB storage
-    total += await OfflineDbManager.getTotalAssetsSize();
-
-    // Cache API storage (approximate from quota)
-    const quota = await this.getStorageQuota();
-    // Note: quota.usage includes all storage, not just our caches
-
+    // IndexedDB storage (primary tracking)
+    const total = await OfflineDbManager.getTotalAssetsSize();
+    // Note: Cache API size is included in browser's quota.usage but not tracked separately
     return total;
   }