diff --git a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetails.svelte b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetails.svelte
index d5ecf4edb2..d9331089fe 100644
--- a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetails.svelte
+++ b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetails.svelte
@@ -3,9 +3,10 @@
 	import ModelsDiscoverDetailsHeader from './ModelsDiscoverDetailsHeader.svelte';
 	import ModelsDiscoverDetailsReadme from './ModelsDiscoverDetailsReadme.svelte';
 	import ModelsDiscoverDetailsSkeleton from './ModelsDiscoverDetailsSkeleton.svelte';
+	import { OTHER_BIT_DEPTH } from '$lib/constants';
 	import { ModelAuxSidecar } from '$lib/enums';
 	import { HuggingFaceService } from '$lib/services';
-	import type { HfModelDetailInfo, HfModelSibling } from '$lib/types/huggingface';
+	import type { BitDepthRow, HfModelDetailInfo, HfModelSibling } from '$lib/types';
 	import { detectThinkingSupport, detectToolUseSupport } from '$lib/utils';
 	import { SvelteMap } from 'svelte/reactivity';
 
@@ -48,7 +49,6 @@
 	// Draft sidecars (mtp, dflash, dspark, eagle3) present in the repo, e.g.
 	// speculative-decoding drafts. mmproj is excluded: it is vision.
 
-	type BitDepthRow = { bitDepth: number; files: HfModelSibling[] };
 	let bitDepthRows = $derived.by<BitDepthRow[]>(() => {
 		const rows = new SvelteMap<number, HfModelSibling[]>();
 
@@ -60,7 +60,7 @@
 			if (meta?.sidecar === ModelAuxSidecar.MMPROJ) continue;
 
 			const depth = meta?.quant ? HuggingFaceService.getBitDepth(meta.quant) : null;
-			const bucket = depth ?? 99;
+			const bucket = depth ?? OTHER_BIT_DEPTH;
 			const list = rows.get(bucket) ?? [];
 
 			list.push(file);
diff --git a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptions.svelte b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptions.svelte
index 0e934033c4..3f99329e34 100644
--- a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptions.svelte
+++ b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptions.svelte
@@ -1,16 +1,11 @@
 <script lang="ts">
-	import {
-		type BitDepthRow,
-		classify,
-		type DownloadEntryState,
-		labelFor,
-		type QuantOption,
-		type SelectableFile
-	} from './download-options.utils';
+	import { classify, labelFor } from './download-options.utils';
 	import ModelsDiscoverDetailsDownloadOptionsDownloadCommand from './ModelsDiscoverDetailsDownloadOptionsDownloadCommand.svelte';
 	import ModelsDiscoverDetailsDownloadOptionsRow from './ModelsDiscoverDetailsDownloadOptionsRow.svelte';
+	import { SelectableFileKind } from '$lib/enums';
 	import { HuggingFaceService, ModelsService } from '$lib/services';
 	import { modelsStore } from '$lib/stores';
+	import type { BitDepthRow, DownloadEntryState, QuantOption, SelectableFile } from '$lib/types';
 
 	interface Props {
 		/** Full HuggingFace repo id, e.g. `ggml-org/gemma-3-4b-it-GGUF`. */
@@ -98,7 +93,9 @@
 	}
 
 	/** Non-draft quants for the command's base select, in row order. */
-	let mainOptions = $derived(selectableFiles.filter((f) => f.kind === 'main').map(optionFor));
+	let mainOptions = $derived(
+		selectableFiles.filter((f) => f.kind === SelectableFileKind.MAIN).map(optionFor)
+	);
 
 	/**
 	 * Draft options for the command's draft select, with their sidecar type
@@ -106,7 +103,7 @@
 	 */
 	let draftOptions = $derived(
 		selectableFiles
-			.filter((f) => f.kind === 'draft')
+			.filter((f) => f.kind === SelectableFileKind.DRAFT)
 			.map((f) => ({
 				...optionFor(f),
 				badge: HuggingFaceService.extractQuantMeta(f.path)?.sidecar ?? null
diff --git a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsDownloadCommand.svelte b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsDownloadCommand.svelte
index 86b67eeb5a..8b26fd3a58 100644
--- a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsDownloadCommand.svelte
+++ b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsDownloadCommand.svelte
@@ -1,9 +1,10 @@
 <script lang="ts">
-	import { quantBitDepth, type QuantOption, SPEC_TYPE } from './download-options.utils';
+	import { quantBitDepth } from './download-options.utils';
 	import { Check, Copy, Plus, X } from '@lucide/svelte';
 	import * as Select from '$lib/components/ui/select';
-	import { type ModelSidecar } from '$lib/constants';
+	import { DEFAULT_BASE_BIT_DEPTH, type ModelSidecar,SPEC_TYPE } from '$lib/constants';
 	import { HuggingFaceService } from '$lib/services';
+	import type { QuantOption } from '$lib/types';
 	import { copyToClipboard } from '$lib/utils';
 
 	interface Props {
@@ -22,9 +23,6 @@
 	let draftTypePick = $state<ModelSidecar | null>(null);
 	let withDraft = $state(false);
 
-	/** Bit depth to prefer in the default base quant; the closest one wins. */
-	const DEFAULT_BASE_BIT_DEPTH = 4;
-
 	function bitDepthOf(path: string): number {
 		return quantBitDepth(HuggingFaceService.extractQuantMeta(path)?.quant ?? null);
 	}
diff --git a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsQuantDownloadButton.svelte b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsQuantDownloadButton.svelte
index 2bc96e63ed..1a47cd439c 100644
--- a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsQuantDownloadButton.svelte
+++ b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsQuantDownloadButton.svelte
@@ -1,12 +1,12 @@
 <script lang="ts">
 	import DownloadProgressBar from '../../DownloadProgressBar.svelte';
-	import { type DownloadEntryState, labelFor } from './download-options.utils';
+	import { labelFor } from './download-options.utils';
 	import { Check, Download, Loader2, Pause, Play, RotateCw, X } from '@lucide/svelte';
 	import DialogConfirmation from '$lib/components/app/dialogs/DialogConfirmation.svelte';
 	import * as Tooltip from '$lib/components/ui/tooltip';
 	import { HuggingFaceService } from '$lib/services';
 	import { modelsStore } from '$lib/stores';
-	import type { HfModelSibling } from '$lib/types';
+	import type { DownloadEntryState, HfModelSibling } from '$lib/types';
 
 	interface Props {
 		/** GGUF file the chip stands for. */
diff --git a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsRow.svelte b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsRow.svelte
index ad56d9d94a..d4d784656d 100644
--- a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsRow.svelte
+++ b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/ModelsDiscoverDetailsDownloadOptionsRow.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
-	import type { DownloadEntryState, SelectableFile } from './download-options.utils';
 	import ModelsDiscoverDetailsDownloadOptionsQuantDownloadButton from './ModelsDiscoverDetailsDownloadOptionsQuantDownloadButton.svelte';
+	import { SelectableFileKind } from '$lib/enums';
+	import type { DownloadEntryState, SelectableFile } from '$lib/types';
 	import { minMemoryTierGb } from '$lib/utils';
 
 	interface Props {
@@ -12,8 +13,8 @@
 
 	let { bitDepth, files }: Props = $props();
 
-	let mainFile = $derived(files.find((f) => f.kind === 'main') ?? null);
-	let draftFile = $derived(files.find((f) => f.kind === 'draft') ?? null);
+	let mainFile = $derived(files.find((f) => f.kind === SelectableFileKind.MAIN) ?? null);
+	let draftFile = $derived(files.find((f) => f.kind === SelectableFileKind.DRAFT) ?? null);
 
 	let mainMemGb = $derived(mainFile ? minMemoryTierGb(mainFile.size ?? 0) : null);
 	let draftMemGb = $derived(draftFile ? minMemoryTierGb(draftFile.size ?? 0) : null);
diff --git a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/download-options.utils.ts b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/download-options.utils.ts
index 58d46e6549..19866eae4c 100644
--- a/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/download-options.utils.ts
+++ b/tools/ui/src/lib/components/app/models/discover/ModelsDiscoverDetails/ModelsDiscoverDetailsDownloadOptions/download-options.utils.ts
@@ -1,44 +1,24 @@
-import { isAuxSidecar, isDraftSidecar, type ModelSidecar } from '$lib/constants';
-import { ModelAuxSidecar, ModelDraftSidecar } from '$lib/enums';
+import { DRAFT_FILE_LABEL, isAuxSidecar, isDraftSidecar, OTHER_BIT_DEPTH } from '$lib/constants';
+import { SelectableFileKind } from '$lib/enums';
 import { HuggingFaceService } from '$lib/services';
-import type { HfModelSibling } from '$lib/types/huggingface';
 
-/**
- * Option of a quant `<select>`; the picks only compose the serve command and
- * are not bound to the quant chips.
- */
-export interface QuantOption {
-	/** Quant token, or the file name when the file carries no quant (e.g. BF16). */
-	label: string;
-	/** Repo-relative file path the option stands for. */
-	path: string;
-}
-
-/** Download state of a single repo entry, injected by the integration layer. */
-export interface DownloadEntryState {
-	/** Server identifier the entry's actions (pause / resume / cancel / retry) target. */
-	repoWithTag: string;
-	isDownloading: boolean;
-	progress: ModelDownloadProgress | null;
-	isDownloaded: boolean;
-	isPaused: boolean;
-	isFailed: boolean;
-}
-
-/** Download state of a single repo entry, injected by the integration layer. */
-
-export type BitDepthRow = { bitDepth: number; files: HfModelSibling[] };
-
-/** A selectable GGUF, tagged with its kind: main weights, draft, or aux (mmproj). */
-export type SelectableFile = HfModelSibling & { kind: 'main' | 'draft' | 'aux' };
+/** Leading `UD-` (Unsloth Dynamic) quant prefix and its length. */
+const UD_QUANT_PREFIX = 'UD-';
+const UD_QUANT_PREFIX_REGEX = /^UD-(?=.)/i;
+/** Captures the bit-depth digits of a quant token, e.g. `Q4_K_M` -> `4`. */
+const QUANT_BIT_DEPTH_REGEX = /(?:I?Q|F)(\d+)/i;
+/** Trailing weight extension, stripped from a quantless file's label. */
+const WEIGHT_EXTENSION_LABEL_REGEX = /\.gguf$/i;
+/** Path separator between path segments. */
+const PATH_SEPARATOR = '/';
 
 /** Kind of a file path: the main weights, a draft sidecar, or an aux sidecar (mmproj). */
-export function classify(path: string): 'main' | 'draft' | 'aux' {
+export function classify(path: string): SelectableFileKind {
 	const sidecar = HuggingFaceService.extractQuantMeta(path)?.sidecar;
 
-	if (!sidecar) return 'main';
+	if (!sidecar) return SelectableFileKind.MAIN;
 
-	return isAuxSidecar(sidecar) ? 'aux' : 'draft';
+	return isAuxSidecar(sidecar) ? SelectableFileKind.AUX : SelectableFileKind.DRAFT;
 }
 
 /** Display label of a file: its quant, else the file name without the extension. */
@@ -49,32 +29,22 @@ export function labelFor(path: string): string {
 
 	// Quantless sidecar files: the chip badge already carries the sidecar type,
 	// so the label only marks draft files; aux sidecars badge alone.
-	if (meta?.sidecar) return isDraftSidecar(meta.sidecar) ? 'draft' : '';
+	if (meta?.sidecar) return isDraftSidecar(meta.sidecar) ? DRAFT_FILE_LABEL : '';
 
-	const basename = path.split('/').pop() ?? path;
+	const basename = path.split(PATH_SEPARATOR).pop() ?? path;
 
-	return basename.replace(/\.gguf$/i, '');
+	return basename.replace(WEIGHT_EXTENSION_LABEL_REGEX, '');
 }
 
 /**
- * Bit depth of a quant token; `99` (Other) when it carries none. The `UD-`
+ * Bit depth of a quant token; `OTHER_BIT_DEPTH` when it carries none. The `UD-`
  * unsloth prefix is stripped before matching.
  */
 export function quantBitDepth(quant: string | null): number {
-	if (!quant) return 99;
+	if (!quant) return OTHER_BIT_DEPTH;
 
-	const stripped = quant.match(/^UD-(?=.)/i) ? quant.slice(3) : quant;
-	const bit = stripped.match(/(?:I?Q|F)(\d+)/i)?.[1];
+	const stripped = UD_QUANT_PREFIX_REGEX.test(quant) ? quant.slice(UD_QUANT_PREFIX.length) : quant;
+	const bit = stripped.match(QUANT_BIT_DEPTH_REGEX)?.[1];
 
-	return bit ? Number(bit) : 99;
+	return bit ? Number(bit) : OTHER_BIT_DEPTH;
 }
-
-// LLAMA-APP-REUSE: --spec-type value for each draft sidecar; aux sidecars stay empty
-export const SPEC_TYPE: Record<ModelSidecar, string> = {
-	[ModelAuxSidecar.IMATRIX]: '',
-	[ModelAuxSidecar.MMPROJ]: '',
-	[ModelDraftSidecar.DFLASH]: 'draft-dflash',
-	[ModelDraftSidecar.DSPARK]: 'draft-dspark',
-	[ModelDraftSidecar.EAGLE3]: 'eagle3',
-	[ModelDraftSidecar.MTP]: 'draft-mtp'
-};
diff --git a/tools/ui/src/lib/constants/index.ts b/tools/ui/src/lib/constants/index.ts
index 9dc2cfed64..c2749a95eb 100644
--- a/tools/ui/src/lib/constants/index.ts
+++ b/tools/ui/src/lib/constants/index.ts
@@ -45,6 +45,7 @@ export * from './path-display.constants';
 export * from './model-id.constants';
 export * from './model-loading.constants';
 export * from './models-discover.constants';
+export * from './models-discover-download.constants';
 export * from './huggingface.constants';
 export * from './precision.constants';
 export * from './pwa.constants';
diff --git a/tools/ui/src/lib/constants/models-discover-download.constants.ts b/tools/ui/src/lib/constants/models-discover-download.constants.ts
new file mode 100644
index 0000000000..6ad4b3d5a8
--- /dev/null
+++ b/tools/ui/src/lib/constants/models-discover-download.constants.ts
@@ -0,0 +1,34 @@
+/**
+ * Models Discover — download options constants.
+ *
+ * Shared values backing the download-options area of the details pane: the
+ * serve `--spec-type` mapping, the bit-depth buckets, and the standalone
+ * command builder. Kept here (not component-local) so they sit with the rest
+ * of the discover domain constants.
+ */
+
+import type { ModelSidecar } from '$lib/constants';
+import { ModelAuxSidecar, ModelDraftSidecar } from '$lib/enums';
+
+/**
+ * `--spec-type` value for each draft sidecar; aux sidecars (mmproj, imatrix)
+ * carry none and stay empty.
+ */
+// LLAMA-APP-REUSE: --spec-type value for each draft sidecar; aux sidecars stay empty
+export const SPEC_TYPE: Record<ModelSidecar, string> = {
+	[ModelAuxSidecar.IMATRIX]: '',
+	[ModelAuxSidecar.MMPROJ]: '',
+	[ModelDraftSidecar.DFLASH]: 'draft-dflash',
+	[ModelDraftSidecar.DSPARK]: 'draft-dspark',
+	[ModelDraftSidecar.EAGLE3]: 'eagle3',
+	[ModelDraftSidecar.MTP]: 'draft-mtp'
+};
+
+/** Bit-depth bucket for files that carry no quant token; rendered as "Other". */
+export const OTHER_BIT_DEPTH = 99;
+
+/** Bit depth preferred for the command's default base quant. */
+export const DEFAULT_BASE_BIT_DEPTH = 4;
+
+/** Label shown for a draft-sidecar chip whose quant is unknown. */
+export const DRAFT_FILE_LABEL = 'draft';
diff --git a/tools/ui/src/lib/enums/index.ts b/tools/ui/src/lib/enums/index.ts
index db4f5b68cb..cedb514f5c 100644
--- a/tools/ui/src/lib/enums/index.ts
+++ b/tools/ui/src/lib/enums/index.ts
@@ -69,7 +69,13 @@ export {
 	JsonSchemaType
 } from './mcp.enums';
 
-export { ModelAuxSidecar, ModelCapability, ModelDraftSidecar, ModelModality } from './model.enums';
+export {
+	ModelAuxSidecar,
+	ModelCapability,
+	ModelDraftSidecar,
+	ModelModality,
+	SelectableFileKind
+} from './model.enums';
 
 export { ServerRole, ServerModelStatus, ServerModelsSseEventType } from './server.enums';
 
diff --git a/tools/ui/src/lib/enums/model.enums.ts b/tools/ui/src/lib/enums/model.enums.ts
index 100d1f2dc5..19d2d83714 100644
--- a/tools/ui/src/lib/enums/model.enums.ts
+++ b/tools/ui/src/lib/enums/model.enums.ts
@@ -31,8 +31,18 @@ export enum ModelDraftSidecar {
  * accompanying the main model weights.
  */
 export enum ModelAuxSidecar {
-	/** Multimodal projector: unlocks vision and/or audio input modalities. */
-	MMPROJ = 'mmproj',
 	/** Importance-matrix data used to build imatrix quants; not loaded at serve time. */
-	IMATRIX = 'imatrix'
+	IMATRIX = 'imatrix',
+	/** Multimodal projector: unlocks vision and/or audio input modalities. */
+	MMPROJ = 'mmproj'
+}
+
+/**
+ * Role of a selectable GGUF in the download options: the main weights, a
+ * speculative-decoding draft sidecar, or an auxiliary sidecar (mmproj).
+ */
+export enum SelectableFileKind {
+	AUX = 'aux',
+	DRAFT = 'draft',
+	MAIN = 'main'
 }
diff --git a/tools/ui/src/lib/types/index.ts b/tools/ui/src/lib/types/index.ts
index cd9b94047e..7338b7a3a4 100644
--- a/tools/ui/src/lib/types/index.ts
+++ b/tools/ui/src/lib/types/index.ts
@@ -115,6 +115,14 @@ export type {
 	ModalityCapabilities
 } from './models';
 
+// Models discover types
+export type {
+	BitDepthRow,
+	DownloadEntryState,
+	QuantOption,
+	SelectableFile
+} from './models-discover';
+
 // Settings types
 export type {
 	SettingsConfigValue,
diff --git a/tools/ui/src/lib/types/models-discover.d.ts b/tools/ui/src/lib/types/models-discover.d.ts
new file mode 100644
index 0000000000..b28d6c3d31
--- /dev/null
+++ b/tools/ui/src/lib/types/models-discover.d.ts
@@ -0,0 +1,30 @@
+import type { SelectableFileKind } from '$lib/enums';
+import type { HfModelSibling } from '$lib/types/huggingface';
+
+/**
+ * Option of a quant `<select>` in the download-options command builder; the
+ * picks only compose the serve command and are not bound to the quant chips.
+ */
+export interface QuantOption {
+	/** Quant token, or the file name when the file carries no quant (e.g. BF16). */
+	label: string;
+	/** Repo-relative file path the option stands for. */
+	path: string;
+}
+
+/** Download state of a single repo entry, injected by the integration layer. */
+export interface DownloadEntryState {
+	/** Server identifier the entry's actions (pause / resume / cancel / retry) target. */
+	repoWithTag: string;
+	isDownloading: boolean;
+	progress: ModelDownloadProgress | null;
+	isDownloaded: boolean;
+	isPaused: boolean;
+	isFailed: boolean;
+}
+
+/** A group of GGUF files sharing one bit-depth bucket. */
+export type BitDepthRow = { bitDepth: number; files: HfModelSibling[] };
+
+/** A selectable GGUF, tagged with its role: main weights, draft, or aux (mmproj). */
+export type SelectableFile = HfModelSibling & { kind: SelectableFileKind };