feat(import): enhance image URL handling and error reporting during recipe import

backend/src/quick-import/quick-import.service.ts

@@ -20,6 +20,7 @@ export interface QuickImportResult {
   markdown: string;
   source: 'ica' | 'pdf' | 'image' | 'other';
   imageUrl?: string;
+  imageWarning?: string;
 }
 
 type UploadKind = 'pdf' | 'image';
@@ -317,12 +318,24 @@ export class QuickImportService {
 
       // Ladda ner och optimera bild om parser hittade en
       let imageUrl: string | undefined;
+      let imageWarning: string | undefined;
       if (recipe.imageUrl) {
-        try {
-          imageUrl = await downloadAndOptimizeImage(recipe.imageUrl, IMAGE_DEST_DIR);
-          this.logger.log(`Bild optimerad och sparad: ${imageUrl}`);
-        } catch (imgErr) {
-          this.logger.warn(`Kunde inte ladda ner bild: ${imgErr}`);
+        const normalizedImageUrl = this.normalizeImageUrl(recipe.imageUrl, url);
+        if (!normalizedImageUrl) {
+          imageWarning = 'Receptbild kunde inte tolkas till en giltig URL.';
+          this.logger.warn(
+            `Kunde inte normalisera bild-URL: "${recipe.imageUrl}" (källsida: ${url})`,
+          );
+        } else {
+          try {
+            imageUrl = await downloadAndOptimizeImage(normalizedImageUrl, IMAGE_DEST_DIR);
+            this.logger.log(`Bild optimerad och sparad: ${imageUrl}`);
+          } catch (imgErr) {
+            imageWarning = 'Receptbild kunde inte laddas ner.';
+            this.logger.warn(
+              `Kunde inte ladda ner bild: ${imgErr} (källa: ${normalizedImageUrl})`,
+            );
+          }
         }
       }
 
@@ -330,6 +343,7 @@ export class QuickImportService {
         markdown,
         source,
         imageUrl,
+        imageWarning,
       };
     } catch (err) {
       const message = err instanceof Error ? err.message : 'Okänt fel vid scraping';
@@ -340,6 +354,20 @@ export class QuickImportService {
     }
   }
 
+  private normalizeImageUrl(rawImageUrl: string, pageUrl: string): string | null {
+    const trimmed = rawImageUrl.trim();
+    if (!trimmed) return null;
+
+    const protocolNormalized =
+      trimmed.startsWith('//') ? `https:${trimmed}` : trimmed;
+
+    try {
+      return new URL(protocolNormalized, pageUrl).toString();
+    } catch {
+      return null;
+    }
+  }
+
   /**
    * Konvertera receptobjekt till Markdown-format
    */