diff --git a/.github/workflows/guard-translations.yml b/.github/workflows/guard-translations.yml
index 633f5497..70caef21 100644
--- a/.github/workflows/guard-translations.yml
+++ b/.github/workflows/guard-translations.yml
@@ -57,8 +57,14 @@ jobs:
           #
           # --diff-filter=MD keeps only Modified and Deleted paths: edits to files that ALREADY exist
           # on the base branch. Added (A) files are handled separately per client below.
-          edited="$(git diff --no-renames --diff-filter=MD --name-only "$BASE_SHA" "$HEAD_SHA" || true)"
-          added="$(git diff --no-renames --diff-filter=A --name-only "$BASE_SHA" "$HEAD_SHA" || true)"
+          # Three dots, not two. `git diff A B` compares the two trees as they stand, so every
+          # commit that landed on the base branch after this PR forked shows up as if the PR had
+          # changed it -- a Weblate sync merging to master made unrelated PRs fail with
+          # "client_v2/locales/sv/common.json" in the offending list. `git diff A...B` diffs from
+          # the MERGE BASE instead, which is exactly "what this PR changed" and stays correct no
+          # matter how far master has moved on.
+          edited="$(git diff --no-renames --diff-filter=MD --name-only "$BASE_SHA...$HEAD_SHA" || true)"
+          added="$(git diff --no-renames --diff-filter=A --name-only "$BASE_SHA...$HEAD_SHA" || true)"
 
           # Active client: edits to existing non-English files are blocked, new languages are fine.
           offending_v2="$(printf '%s\n' "$edited" \
diff --git a/client_v2/locales/en/common.json b/client_v2/locales/en/common.json
index 6871b959..5cbe8dcd 100644
--- a/client_v2/locales/en/common.json
+++ b/client_v2/locales/en/common.json
@@ -290,6 +290,8 @@
     "library.nUnused": "×{{count}} unused",
     "library.noLocation": "no location",
     "library.noValues": "No values",
+    "library.openGroup": "Open {{name}}",
+    "library.openManufacturer": "Open manufacturer {{name}}",
     "library.section.extra": "Extra fields",
     "library.section.filament": "Filament",
     "library.section.spool": "Spool",
diff --git a/client_v2/src/lib/api/map.ts b/client_v2/src/lib/api/map.ts
index b4b6c777..71b7d84a 100644
--- a/client_v2/src/lib/api/map.ts
+++ b/client_v2/src/lib/api/map.ts
@@ -106,11 +106,19 @@ export function mapGroup(g: Json): GroupSummary {
 	let badge = '';
 	let colors: string[] = [];
 	let direction: MultiColorDirection | undefined;
+	// Filament groups carry their manufacturer separately from the subtitle text
+	// so the header can render it as a link to the vendor (see GroupHeader).
+	let vendorId: string | undefined;
+	let vendorName: string | undefined;
 
 	if (field === 'filament' && g.filament) {
 		const f: Json = g.filament;
 		title = f.name ?? '(unnamed filament)';
-		subtitle = `${f.vendor?.name ?? 'No manufacturer'} · ${f.diameter} mm`;
+		subtitle = `${f.diameter} mm`;
+		if (f.vendor) {
+			vendorId = String(f.vendor.id);
+			vendorName = f.vendor.name ?? '(unnamed manufacturer)';
+		}
 		badge = f.material ?? '';
 		colors = colorsFromApi(f);
 		direction = f.multi_color_direction ?? undefined;
@@ -136,6 +144,8 @@ export function mapGroup(g: Json): GroupSummary {
 		title,
 		subtitle,
 		badge,
+		vendorId,
+		vendorName,
 		colors,
 		direction,
 		spoolCount: g.spool_count ?? 0,
diff --git a/client_v2/src/lib/api/types.ts b/client_v2/src/lib/api/types.ts
index ef443610..390ba7fb 100644
--- a/client_v2/src/lib/api/types.ts
+++ b/client_v2/src/lib/api/types.ts
@@ -29,6 +29,10 @@ export interface GroupSummary {
 	title: string;
 	subtitle: string;
 	badge: string;
+	/** Filament groups only: the manufacturer, so the header can link to it.
+	 *  Both absent when the filament has no manufacturer set. */
+	vendorId?: string;
+	vendorName?: string;
 	colors: string[];
 	/** Multi-color layout, when grouping by a single filament; undefined otherwise. */
 	direction?: MultiColorDirection;
diff --git a/client_v2/src/lib/components/Breadcrumbs.svelte b/client_v2/src/lib/components/Breadcrumbs.svelte
index 9bbe276b..81cecd3b 100644
--- a/client_v2/src/lib/components/Breadcrumbs.svelte
+++ b/client_v2/src/lib/components/Breadcrumbs.svelte
@@ -51,8 +51,13 @@
 		font: inherit;
 		text-decoration: none;
 	}
+	/* Underlined on hover, not just recoloured: a crumb is a short piece of dim
+	   text in a corner, and colour alone left people reading it as a caption rather
+	   than as the way to the manufacturer (#989). */
 	.crumb:hover {
 		color: var(--accent-link-hover);
+		text-decoration: underline;
+		text-underline-offset: 2px;
 	}
 	.current {
 		color: var(--text-2);
diff --git a/client_v2/src/lib/components/library/GroupHeader.svelte b/client_v2/src/lib/components/library/GroupHeader.svelte
index 469445f9..e37d84ba 100644
--- a/client_v2/src/lib/components/library/GroupHeader.svelte
+++ b/client_v2/src/lib/components/library/GroupHeader.svelte
@@ -1,7 +1,11 @@
 <script lang="ts">
+	/* eslint-disable svelte/no-navigation-without-resolve --
+	   Both hrefs come from a src/lib/library/params.ts helper, which already resolves
+	   against the deploy base path; resolving again would double-apply it. */
 	import Swatch from '../Swatch.svelte';
 	import MaterialBadge from '../MaterialBadge.svelte';
 	import ChevronRight from '@lucide/svelte/icons/chevron-right';
+	import Factory from '@lucide/svelte/icons/factory';
 	import type { GroupHeaderInfo } from '$lib/utils/library';
 	import * as m from '$lib/paraglide/messages';
 
@@ -11,46 +15,87 @@
 		 *  its inspector, so the header is a real `<a>`. Absent for groupings with
 		 *  no entity to open (material/location) — then it's inert. */
 		href?: string;
+		/** Filament groups: link to the manufacturer's inspector. Absent when the
+		 *  filament has no manufacturer (the name then renders as a muted note). */
+		vendorHref?: string;
 		sticky?: boolean;
 		/** Whether the group's spools are folded away behind this header. */
 		collapsed?: boolean;
 		ontoggle?: () => void;
 	}
 
-	let { group, href, sticky = false, collapsed = false, ontoggle }: Props = $props();
+	let { group, href, vendorHref, sticky = false, collapsed = false, ontoggle }: Props = $props();
 </script>
 
-<!-- The row is two controls, not one: the body opens the group's entity (where it
-     has one), and the disclosure at the trailing edge folds its spools away. They
-     are siblings rather than nested so both are real, keyboard-reachable controls.
+<!-- The row is three controls, not one: the body opens the group's entity (where it
+     has one), the manufacturer opens ITS entity, and the disclosure at the trailing
+     edge folds the spools away. They are siblings rather than nested — anchors can't
+     nest, and all three should be real, keyboard-reachable controls.
      Living in the header — which is sticky — is what keeps the fold reachable while
-     you are scrolled deep inside a long group, which is exactly when you want it. -->
+     you are scrolled deep inside a long group, which is exactly when you want it.
+
+     The entity link is only the title, but its stretched ::after (see the styles)
+     extends its hit area over the whole row, so the row-wide click target survives
+     the two links being siblings. That is also what makes `.main:hover` mean
+     "anywhere on the row except the other two controls", which is the precision the
+     hover affordance below needs. -->
 <div class="header" class:sticky class:link={href}>
-	<svelte:element
-		this={href ? 'a' : 'div'}
-		class="main"
-		{href}
-		data-sveltekit-keepfocus={href ? '' : undefined}
-		data-sveltekit-noscroll={href ? '' : undefined}
-	>
-		{#if group.colors.length}
-			<Swatch colors={group.colors} direction={group.direction} size={24} radius={6} />
-		{/if}
-		<div class="body">
-			<div class="line">
-				<span class="title">{group.title}</span>
-				{#if group.badge}<MaterialBadge label={group.badge} />{/if}
+	{#if href}
+		<!-- The entity link is an overlay covering the whole row, not a box around the
+		     title: it has to be a sibling of the manufacturer link (anchors can't
+		     nest), and covering the row keeps the generous click target the header
+		     always had. It comes first so `~` can reach the title it labels. -->
+		<a
+			class="main"
+			{href}
+			aria-label={m['library.openGroup']({ name: group.title })}
+			data-sveltekit-keepfocus
+			data-sveltekit-noscroll
+		></a>
+	{/if}
+	{#if group.colors.length}
+		<Swatch colors={group.colors} direction={group.direction} size={24} radius={6} />
+	{/if}
+	<div class="body">
+		<div class="line">
+			<!-- A group header reads as a heading, and headings don't normally lead
+			     anywhere — so the link has to say so itself, by taking the underline
+			     and colour every link gets on hover. -->
+			<span class="title">{group.title}</span>
+			{#if group.badge}<MaterialBadge label={group.badge} />{/if}
+		</div>
+		{#if group.vendorName || group.subtitle}
+			<div class="sub">
+				<!-- The manufacturer is already printed on every filament group, so this
+				     is the shortest possible route to one: no menu, no search, no detour
+				     through a filament. Its own pill-shaped hover is what separates it
+				     from the row-wide link it sits inside. -->
+				{#if group.vendorName && vendorHref}
+					<a
+						class="vendor"
+						href={vendorHref}
+						title={m['library.openManufacturer']({ name: group.vendorName })}
+						data-sveltekit-keepfocus
+						data-sveltekit-noscroll
+					>
+						<Factory size={11} />
+						<span class="vname">{group.vendorName}</span>
+					</a>
+				{:else if group.vendorName}
+					<span class="vendor-none">{group.vendorName}</span>
+				{/if}
+				{#if group.vendorName && group.subtitle}<span class="dot" aria-hidden="true">·</span>{/if}
+				{#if group.subtitle}<span class="stext">{group.subtitle}</span>{/if}
 			</div>
-			{#if group.subtitle}<div class="sub">{group.subtitle}</div>{/if}
-		</div>
-		<!-- The group's two aggregates, stacked to mirror the title/subtitle opposite
-		     them: what it holds, and how much of it. The count is also what says the
-		     rows below are ALL of this group's spools, not the first few. -->
-		<div class="meta">
-			<span class="weight">{group.meta}</span>
-			<span class="count">{group.count}</span>
-		</div>
-	</svelte:element>
+		{/if}
+	</div>
+	<!-- The group's two aggregates, stacked to mirror the title/subtitle opposite
+	     them: what it holds, and how much of it. The count is also what says the
+	     rows below are ALL of this group's spools, not the first few. -->
+	<div class="meta">
+		<span class="weight">{group.meta}</span>
+		<span class="count">{group.count}</span>
+	</div>
 	<button
 		class="disc"
 		type="button"
@@ -66,16 +111,22 @@
 
 <style>
 	.header {
+		/* Positioned so the entity link's stretched ::after resolves against the row.
+		   Nothing in here may clip overflow, or that hit area would be cut down to
+		   whichever box does the clipping (hence the per-span truncation below). */
+		position: relative;
 		display: flex;
-		align-items: stretch;
+		align-items: center;
+		gap: 10px;
 		width: 100%;
+		padding: 9px 0 9px 14px;
 		border-top: 1px solid var(--border-soft);
 		border-left: 2px solid transparent;
 		background: none;
 		box-sizing: border-box;
 	}
 	/* Only entity-backed headers (filament/vendor) lead anywhere, so only they take
-	   the row-wide hover; the disclosure keeps its own, quieter one either way. */
+	   the row-wide hover; the other two controls keep their own on top of it. */
 	.header.link:hover {
 		background: var(--surface-2);
 	}
@@ -85,21 +136,6 @@
 		z-index: 1;
 		background: var(--surface-sunken);
 	}
-	.main {
-		display: flex;
-		align-items: center;
-		gap: 10px;
-		flex: 1;
-		min-width: 0;
-		padding: 9px 0 9px 14px;
-		color: inherit;
-		text-align: left;
-		text-decoration: none;
-		font: inherit;
-	}
-	.header.link .main {
-		cursor: pointer;
-	}
 	.body {
 		min-width: 0;
 		flex: 1;
@@ -108,21 +144,83 @@
 		display: flex;
 		align-items: baseline;
 		gap: 7px;
-		white-space: nowrap;
-		overflow: hidden;
+		min-width: 0;
+	}
+	/* The row-sized hit area itself: transparent and unpainted, it only takes clicks
+	   and hovers. Sized by the row rather than by the title so assistive tooling and
+	   tap-target audits measure the target people actually press. The manufacturer
+	   link and the disclosure lift themselves above it. */
+	.main {
+		position: absolute;
+		inset: 0;
+		cursor: pointer;
+	}
+	/* The swatch is positioned (it layers its colour bands), so it would otherwise
+	   paint above the overlay and swallow clicks on that corner of the row. It is
+	   decorative here — the row's link is what it belongs to. */
+	.header :global(.swatch) {
+		pointer-events: none;
 	}
 	.title {
 		font-weight: 600;
 		font-size: 13px;
-	}
-	.sub {
-		font-size: 11px;
-		color: var(--text-dim);
-		margin-top: 2px;
 		white-space: nowrap;
 		overflow: hidden;
 		text-overflow: ellipsis;
 	}
+	/* Driven from the overlay, so the title reacts to the row being hovered anywhere
+	   — but NOT to the two controls stacked above it, which lead somewhere else. */
+	.main:hover ~ .body .title {
+		color: var(--accent-link);
+		text-decoration: underline;
+		text-underline-offset: 2px;
+	}
+	.sub {
+		display: flex;
+		align-items: center;
+		gap: 5px;
+		min-width: 0;
+		font-size: 11px;
+		color: var(--text-dim);
+		margin-top: 2px;
+	}
+	.vname,
+	.stext {
+		white-space: nowrap;
+		overflow: hidden;
+		text-overflow: ellipsis;
+	}
+	.dot {
+		flex: none;
+	}
+	/* Above the stretched link, or it would never be clickable. The padding makes it
+	   a ~28px tap target (over the 24px WCAG 2.2 floor) while the matching negative
+	   margin keeps it laid out as if it had none — so the header stays as tight as
+	   it was and the name still lines up under the title. */
+	.vendor {
+		position: relative;
+		z-index: 1;
+		display: inline-flex;
+		align-items: center;
+		gap: 4px;
+		min-width: 0;
+		padding: 7px;
+		margin: -7px;
+		border-radius: var(--radius-sm);
+		/* --accent-link is tuned for the lighter surfaces links normally sit on; on
+		   the sunken header it only reaches 4.2:1 in the light theme. --accent-soft
+		   is the same hue and clears AA on this surface in both themes (4.9 / 7.3). */
+		color: var(--accent-soft);
+		text-decoration: none;
+		cursor: pointer;
+	}
+	.vendor:hover {
+		background: var(--surface-raised);
+		color: var(--accent-link-hover);
+	}
+	.vendor-none {
+		font-style: italic;
+	}
 	.meta {
 		display: flex;
 		flex-direction: column;
@@ -140,20 +238,28 @@
 		color: var(--text-faint);
 	}
 	/* Full-height so the hit target is the whole right edge of the header — far
-	   easier to hit on a phone than the glyph, without drawing a heavier control. */
+	   easier to hit on a phone than the glyph, without drawing a heavier control.
+	   Above the stretched link for the same reason the manufacturer is. */
 	.disc {
+		position: relative;
+		z-index: 1;
+		align-self: stretch;
 		display: flex;
 		align-items: center;
 		justify-content: center;
 		flex: none;
 		width: 34px;
+		margin: -9px 0;
 		padding: 0;
 		border: none;
 		background: none;
 		color: var(--text-faint);
 		cursor: pointer;
 	}
+	/* Its own hover, distinct from the row's, so the fold reads as a separate
+	   control rather than as part of the link it sits next to. */
 	.disc:hover {
+		background: var(--surface-raised);
 		color: var(--text-2);
 	}
 	.chev {
diff --git a/client_v2/src/lib/components/library/GroupRow.svelte b/client_v2/src/lib/components/library/GroupRow.svelte
index 7cf9d0d9..f9adc404 100644
--- a/client_v2/src/lib/components/library/GroupRow.svelte
+++ b/client_v2/src/lib/components/library/GroupRow.svelte
@@ -132,6 +132,9 @@
 		title: group.title,
 		subtitle: group.subtitle,
 		badge: group.badge,
+		// Filament groups always name their manufacturer — as a link where there is
+		// one to link to, and otherwise as a note that there isn't.
+		vendorName: group.field === 'filament' ? (group.vendorName ?? m['add.noManufacturer']()) : undefined,
 		colors: group.colors,
 		direction: group.direction,
 		meta: weightAuto(group.totalRemaining),
@@ -147,10 +150,19 @@
 				? params.selectHrefFromState(libraryState, 'vendor', group.key)
 				: undefined
 	);
+
+	// The second destination in a filament header: its manufacturer. This is the
+	// only route to a vendor that doesn't go through a menu, the search box, or an
+	// inspector you had to know to open first (#989).
+	let vendorHref = $derived(
+		group.field === 'filament' && group.vendorId
+			? params.selectHrefFromState(libraryState, 'vendor', group.vendorId)
+			: undefined
+	);
 </script>
 
 <div bind:this={el}>
-	<GroupHeader group={header} sticky href={headerHref} {collapsed} ontoggle={toggle} />
+	<GroupHeader group={header} sticky href={headerHref} {vendorHref} {collapsed} ontoggle={toggle} />
 	{#if !collapsed}
 		{#each inUse as vm (vm.spool.id)}
 			<SpoolRow {vm} {showSwatch} indent={26} context={group.field} />
diff --git a/client_v2/src/lib/utils/library.ts b/client_v2/src/lib/utils/library.ts
index 1e2a5f06..924b5c9c 100644
--- a/client_v2/src/lib/utils/library.ts
+++ b/client_v2/src/lib/utils/library.ts
@@ -31,6 +31,9 @@ export interface GroupHeaderInfo {
 	title: string;
 	subtitle: string;
 	badge: string;
+	/** Filament groups: the manufacturer's name, rendered as a link to it when the
+	 *  header also gets a `vendorHref` (and as a muted note when it can't be). */
+	vendorName?: string;
 	colors: string[];
 	direction?: MultiColorDirection;
 	/** Aggregate remaining weight across the whole group, formatted. */