feat: label shared draft variants in download options

Unsloth ships MTP draft heads in two layouts: shared- files borrow the
embedding/output weights from the target model, others are
self-contained. extractQuantMeta now flags a standalone 'shared'
segment, and the chips, quant selects and download CTA show e.g.
'Q4_K_M shared' next to the plain quant so the two files are
distinguishable.

Assisted-by: pi:GLM-5.3-Flash

tools/ui/src/lib/components/app/models/discover/ModelsDiscoverModelDetailsDownloadOptions.svelte

@@ -236,6 +236,9 @@
 		draftEntry ? (HuggingFaceService.extractQuantMeta(draftEntry.path)?.sidecar ?? null) : null
 	);
 
+	/** True when the picked draft is the shared (target-borrowing) variant. */
+	let draftShared = $derived(draftEntry ? (HuggingFaceService.extractQuantMeta(draftEntry.path)?.shared ?? false) : false);
+
 	// LLAMA-APP-REUSE: --spec-type value for each draft sidecar
 	const SPEC_TYPE: Record<ModelSidecar, string> = {
 		[ModelAuxSidecar.MMPROJ]: '',
@@ -341,7 +344,7 @@
 	 */
 	let downloadLabel = $derived.by(() => {
 		const main = mainEntry ?? commandMain;
-		const draftLabel = draftSidecar?.toUpperCase();
+		const draftLabel = draftSidecar ? `${draftSidecar.toUpperCase()}${draftShared ? ' shared' : ''}` : undefined;
 
 		let label = 'Download';
 
@@ -396,7 +399,7 @@
 				<span class="h-px flex-1 bg-border/50"></span>
 
 				<span class="text-xs whitespace-nowrap text-muted-foreground">
-					or download from your terminal
+					or run in your terminal
 				</span>
 
 				<span class="h-px flex-1 bg-border/50"></span>

tools/ui/src/lib/components/app/models/discover/download-options.utils.ts

@@ -33,11 +33,11 @@ export function classify(path: string): 'main' | 'draft' | 'aux' {
 	return isAuxSidecar(sidecar) ? 'aux' : 'draft';
 }
 
-/** Display label of a file: its quant, else the file name without the extension. */
+/** Display label of a file: its quant (plus `shared` for shared draft variants), else the file name without the extension. */
 export function labelFor(path: string): string {
-	const quant = HuggingFaceService.extractQuantMeta(path)?.quant;
+	const meta = HuggingFaceService.extractQuantMeta(path);
 
-	if (quant) return quant;
+	if (meta?.quant) return meta.shared ? `${meta.quant} shared` : meta.quant;
 
 	const basename = path.split('/').pop() ?? path;
 

tools/ui/src/lib/services/huggingface.service.ts

@@ -179,6 +179,8 @@ export class HuggingFaceService {
 	// LLAMA-APP-REUSE: quant + sidecar filename parser
 	static extractQuantMeta(filename: string): {
 		quant: string | null;
+		/** Draft-head-only variant borrowing embed/output weights from the target model. */
+		shared: boolean;
 		sidecar: ModelSidecar | null;
 		sidecarForm: SidecarForm | null;
 	} | null {
@@ -220,6 +222,9 @@ export class HuggingFaceService {
 		// - For main files like `Llama-3-8B-Q4_K_M.gguf` we land on the trailing quant.
 		const segments = source.split(MODEL_ID.SEGMENT_SEPARATOR);
 		const quantIdx = segments.findIndex((seg) => MODEL_ID.QUANTIZATION_SEGMENT_REGEX.test(seg));
+		// Unsloth ships draft heads in two layouts: `shared-` files borrow the
+		// embedding/output weights from the target model, others are self-contained.
+		const shared = segments.some((seg) => seg.toLowerCase() === 'shared');
 
 		let quant = quantIdx >= 0 ? segments[quantIdx].toUpperCase() : null;
 
@@ -232,7 +237,7 @@ export class HuggingFaceService {
 			quant = `${HF_UD_QUANT_PREFIX}-${quant}`;
 		}
 
-		return { quant, sidecar, sidecarForm };
+		return { quant, shared, sidecar, sidecarForm };
 	}
 
 	/**