map: fix subtype filter dropping every measuring tool

MapView carried its own copy of the per-type subtype-id lookup and it
never gained a Measuring Tool branch, so selecting any measuring-tool
subtype filtered out all assets. Marker coloring and the PDF export were
unaffected because both already used the shared getSubtypeId helper.

Point the filter at that shared helper and delete the duplicate copy in
ShopFloorMap too, so one definition serves filter, coloring and export.
Adds a table-driven spec covering every subtype-carrying asset type.

frontend/src/components/ShopFloorMap.vue

@@ -97,6 +97,7 @@ import L from 'leaflet'
 import 'leaflet/dist/leaflet.css'
 import { loadMapConfig, blueprintUrlFor, state as mapConfig } from '../composables/mapConfig'
 import { assetTypeLabel, assetDetailRoute } from '../utils/assetTypes'
+import { getSubtypeId } from '../utils/mapColors'
 import api from '../api'
 
 const props = defineProps({
@@ -239,19 +240,6 @@ const visibleAssetTypes = computed(() => {
   return result
 })
 
-// Get subtype ID from asset based on asset type
-function getSubtypeId(asset) {
-  if (!asset.typedata) return null
-  // Normalize network_device -> network device so the subtype id resolves.
-  const typeLower = (asset.assettype || '').toLowerCase().replace(/_/g, ' ')
-  if (typeLower === 'machine') return asset.typedata.machinetypeid
-  if (typeLower === 'computer') return asset.typedata.computertypeid
-  if (typeLower === 'network device') return asset.typedata.networkdevicetypeid
-  if (typeLower === 'printer') return asset.typedata.printertypeid
-  if (typeLower === 'measuring tool') return asset.typedata.measuringtooltypeid
-  return null
-}
-
 // Get visible subtypes when a type is selected
 const visibleSubtypes = computed(() => {
   if (!props.selectedAssetType) return {}