client_v2: don't link a missing manufacturer in the breadcrumbs

A filament with no vendor resolved through inventory.vendorOf(), whose
placeholder shows as "?" — rendered as a clickable crumb leading to a
broken vendor page. The inspectors now resolve the vendor directly and
fall back to a muted, non-navigable "No manufacturer" crumb, and drop
the "?" from the filament subtitle and spool title as well.

Claude-Session: https://claude.ai/code/session_014Cwk5Yyze9yPvkYkUtMAP4

client_v2/src/lib/components/Breadcrumbs.svelte

@@ -1,10 +1,13 @@
 <script lang="ts">
 	import ChevronRight from '@lucide/svelte/icons/chevron-right';
 	// Inspector breadcrumb trail. The last item is the current entity (rendered
-	// static); earlier items with an `onclick` are navigable.
+	// static); earlier items with an `onclick` are navigable. A `muted` crumb
+	// stands in for a level that doesn't exist (e.g. a filament with no
+	// manufacturer) — there's nothing to navigate to, so it reads as a note.
 	export interface Crumb {
 		label: string;
 		onclick?: () => void;
+		muted?: boolean;
 	}
 	let { items }: { items: Crumb[] } = $props();
 </script>
@@ -14,6 +17,8 @@
 		{#if i > 0}<span class="sep"><ChevronRight size={13} /></span>{/if}
 		{#if c.onclick}
 			<button class="crumb" onclick={c.onclick}>{c.label}</button>
+		{:else if c.muted}
+			<span class="muted">{c.label}</span>
 		{:else}
 			<span class="current">{c.label}</span>
 		{/if}
@@ -43,4 +48,8 @@
 	.current {
 		color: var(--text-2);
 	}
+	.muted {
+		color: var(--text-dim);
+		font-style: italic;
+	}
 </style>

client_v2/src/lib/components/library/FilamentInspector.svelte

@@ -28,7 +28,9 @@
 
 	let { filament }: { filament: Filament } = $props();
 
-	let vendor = $derived(inventory.vendorOf(filament));
+	// Undefined when the filament has no manufacturer set (or it isn't cached yet) —
+	// the display falls back to a plain "no manufacturer" note instead of a link.
+	let vendor = $derived(inventory.vendorById(filament.vendorId));
 
 	// Fetch this filament's spools from the API (scoped list) rather than the cache.
 	// Depend on the primitive id (via $derived) — not `filament` itself — so the
@@ -88,7 +90,9 @@
 <div class="insp">
 	<Breadcrumbs
 		items={[
-			{ label: vendor.name, onclick: () => params.select('vendor', vendor.id) },
+			vendor
+				? { label: vendor.name, onclick: () => params.select('vendor', vendor.id) }
+				: { label: m['add.noManufacturer'](), muted: true },
 			{ label: filament.name }
 		]}
 	/>
@@ -103,7 +107,10 @@
 						title={serverInfo.externalDbName + ' · ' + filament.externalId}>{serverInfo.externalDbName}</span
 					>{/if}
 			</div>
-			<div class="subtitle">{vendor.name} · {filament.material} · {filament.diameter} mm</div>
+			<div class="subtitle">
+				{#if vendor}{vendor.name} ·
+				{/if}{filament.material} · {filament.diameter} mm
+			</div>
 		</div>
 		<div class="add">
 			<Button onclick={() => ui.openAddModal(filament.id)}

client_v2/src/lib/components/library/SpoolInspector.svelte

@@ -47,7 +47,9 @@
 	};
 
 	let filament = $derived(inventory.filamentById(spool.filamentId) ?? MISSING_FIL);
-	let vendor = $derived(inventory.vendorOf(filament));
+	// Undefined when the filament has no manufacturer set (or it isn't cached yet) —
+	// the display falls back to a plain "no manufacturer" note instead of a link.
+	let vendor = $derived(inventory.vendorById(filament.vendorId));
 	let used = $derived(spool.initial - spool.remaining);
 
 	// Existing locations for the location picker: pick an existing one from the
@@ -182,7 +184,9 @@
 <div class="insp">
 	<Breadcrumbs
 		items={[
-			{ label: vendor.name, onclick: () => params.select('vendor', vendor.id) },
+			vendor
+				? { label: vendor.name, onclick: () => params.select('vendor', vendor.id) }
+				: { label: m['add.noManufacturer'](), muted: true },
 			{ label: filament.name, onclick: () => params.select('filament', filament.id) },
 			{ label: '#' + spool.id }
 		]}
@@ -192,7 +196,7 @@
 		<Swatch colors={filament.colors} size={40} radius={9} />
 		<div class="titles">
 			<div class="title">
-				{vendor.name}
+				{#if vendor}{vendor.name}{/if}
 				{filament.name}
 				<span class="idmono mono">#{spool.id}</span>
 				{#if spool.archived}<span class="arch-badge">{m['spool.fields.archived']()}</span>{/if}