fix: preset saving and global pipeline selection

- Use pipelineStore.globalConfig instead of DEFAULT_PIPELINE_CONFIG for
  image processing, so global preset changes affect images
- Fix preset saving from modal to save actual edited config, not global
- Add local preset selection tracking in PipelinePanel for modal context
- Prevent modal config reset when store changes using untrack()
- Derive editingImage from store to always get latest data
- Fix ImagePreview to compare against lastProcessedConfig, not initial
- Preserve custom image overrides when global preset changes
- Clean up unused store functions (updateConfig, updateStep, isModified,
  getEffectiveConfig)
- Use clonePipelineConfig consistently instead of JSON.parse/stringify

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/routes/+page.svelte

@@ -32,7 +32,12 @@
 
 	let showCustomModal = $state(false);
 	let showEditModal = $state(false);
-	let editingImage = $state<ImageEntry | null>(null);
+	let editingImageId = $state<string | null>(null);
+
+	// Derive the editing image from the store to always get the latest data
+	const editingImage = $derived(
+		editingImageId ? imagesStore.images.find((img) => img.id === editingImageId) ?? null : null
+	);
 
 	// View mode for image comparison
 	let viewMode = $state<ViewMode>('compare');
@@ -50,16 +55,17 @@
 		}
 	});
 
-	// Watch for pipeline preset changes and reprocess
+	// Watch for pipeline preset changes and reprocess images without custom overrides
 	$effect(() => {
 		const currentPresetId = pipelineStore.selectedPresetId;
 		if (currentPresetId !== previousPresetId && imagesStore.hasImages) {
 			previousPresetId = currentPresetId;
-			// Clear all image overrides and reprocess with new global config
+			// Only reprocess images that don't have custom overrides
 			for (const img of imagesStore.images) {
-				imagesStore.setPipelineOverride(img.id, null);
+				if (!img.pipelineOverride) {
+					imagesStore.reprocessImage(img.id, deviceStore.selected);
+				}
 			}
-			imagesStore.reprocessAll(deviceStore.selected);
 		}
 	});
 
@@ -77,23 +83,20 @@
 	}
 
 	function handleEditImage(id: string): void {
-		const image = imagesStore.images.find((img) => img.id === id);
-		if (image) {
-			editingImage = image;
-			showEditModal = true;
-		}
+		editingImageId = id;
+		showEditModal = true;
 	}
 
 	function closeEditModal(): void {
 		showEditModal = false;
-		editingImage = null;
+		editingImageId = null;
 	}
 
-	function handleApplyPipeline(imageId: string, config: PipelineConfig, processedDataUrl: string | null): void {
+	function handleApplyPipeline(imageId: string, config: PipelineConfig, processedDataUrl: string | null, processedBlob: Blob | null): void {
 		imagesStore.setPipelineOverride(imageId, config);
-		if (processedDataUrl) {
+		if (processedDataUrl && processedBlob) {
 			// Use the already-processed preview directly
-			imagesStore.updateImage(imageId, { processedDataUrl });
+			imagesStore.updateImage(imageId, { processedDataUrl, processedBlob });
 		} else {
 			// Fallback: reprocess if no preview available
 			imagesStore.reprocessImage(imageId, deviceStore.selected);