fix(ui) : phase 1 review fixes — machine context links, type annotations, double arrow

- Add ?from=machine&machineId=xxx query params to entity NuxtLinks in hierarchy
- Add useRoute + machineId computed to ComponentItem, PieceItem, MachineProductsCard
- Add :string type to confirmRemove* handlers in machine page
- Remove unicode arrow from DetailHeader backLabel (icon already provides it)
- Add !isEditMode guard on product links in MachineProductsCard

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/app/pages/machine/[id].vue

@@ -325,25 +325,25 @@ const submitMachineEdition = async () => {
   refreshVersions()
 }
 
-const confirmRemoveProduct = async (id) => {
+const confirmRemoveProduct = async (id: string) => {
   if (!await confirmDialog({ title: 'Retirer ce produit ?', message: 'Le produit sera dissocié de la machine.', confirmText: 'Retirer', dangerous: true })) return
   await d.removeProductLink(id)
   refreshVersions()
 }
 
-const confirmRemoveComponent = async (id) => {
+const confirmRemoveComponent = async (id: string) => {
   if (!await confirmDialog({ title: 'Retirer ce composant ?', message: 'Le composant sera dissocié de la machine.', confirmText: 'Retirer', dangerous: true })) return
   await d.removeComponentLink(id)
   refreshVersions()
 }
 
-const confirmRemovePiece = async (id) => {
+const confirmRemovePiece = async (id: string) => {
   if (!await confirmDialog({ title: 'Retirer cette pièce ?', message: 'La pièce sera dissociée de la machine.', confirmText: 'Retirer', dangerous: true })) return
   await d.removePieceLink(id)
   refreshVersions()
 }
 
-const confirmRemoveDocument = async (id) => {
+const confirmRemoveDocument = async (id: string) => {
   if (!await confirmDialog({ title: 'Supprimer ce document ?', message: 'Le fichier sera supprimé définitivement.', confirmText: 'Supprimer', dangerous: true })) return
   d.removeMachineDocument(id)
 }