[#MUI-27] Création d'un composant sélection de site (#29)

Composant MalioSiteSelector : bande horizontale pour choisir un site
(usine ou lieu) parmi une liste. Tuiles flex proportionnelles, couleur
du site sélectionné partagée par toutes les tuiles (opacité 1 / 0.4).
Expose update:modelValue (id) + change (objet site complet) pour
faciliter les appels API côté consommateur.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

| Numéro du ticket | Titre du ticket |
|------------------|-----------------|
|                  |                 |

## Description de la PR

## Modification du .env

## Check list

- [ ] Pas de régression
- [ ] TU/TI/TF rédigée
- [ ] TU/TI/TF OK
- [ ] CHANGELOG modifié

Reviewed-on: #29
Co-authored-by: tristan <tristan@yuno.malio.fr>
Co-committed-by: tristan <tristan@yuno.malio.fr>

app/components/malio/site/SiteSelector.vue

@@ -0,0 +1,104 @@
+<template>
+  <div
+    v-bind="$attrs"
+    :id="componentId"
+    role="radiogroup"
+    :class="mergedGroupClass"
+  >
+    <button
+      v-for="site in sites"
+      :key="site.id"
+      type="button"
+      role="radio"
+      :aria-checked="activeId === site.id"
+      :tabindex="activeId === site.id ? 0 : -1"
+      :style="{
+        backgroundColor: activeColor,
+        opacity: activeId === site.id ? 1 : 0.4,
+      }"
+      :class="mergedTileClass"
+      @click="select(site.id)"
+    >
+      <span :class="mergedLabelClass">{{ site.name }}</span>
+    </button>
+  </div>
+</template>
+
+<script setup lang="ts">
+import {computed, ref, useId} from 'vue'
+import {twMerge} from 'tailwind-merge'
+
+defineOptions({name: 'MalioSiteSelector', inheritAttrs: false})
+
+type Site = {
+  id: string
+  name: string
+  color: string
+}
+
+const props = withDefaults(defineProps<{
+  sites: Site[]
+  modelValue?: string
+  id?: string
+  groupClass?: string
+  tileClass?: string
+  labelClass?: string
+}>(), {
+  modelValue: undefined,
+  id: '',
+  groupClass: '',
+  tileClass: '',
+  labelClass: '',
+})
+
+const emit = defineEmits<{
+  (e: 'update:modelValue', value: string): void
+  (e: 'change', site: Site): void
+}>()
+
+const generatedId = useId()
+const componentId = computed(() => props.id || `malio-site-selector-${generatedId}`)
+
+const isControlled = computed(() => props.modelValue !== undefined)
+const localValue = ref(props.sites.length > 0 ? props.sites[0]!.id : '')
+
+const activeId = computed(() =>
+  isControlled.value ? props.modelValue! : localValue.value,
+)
+
+const activeColor = computed(() =>
+  props.sites.find((s) => s.id === activeId.value)?.color ?? '',
+)
+
+const mergedGroupClass = computed(() =>
+  twMerge(
+    'flex w-full',
+    props.groupClass,
+  ),
+)
+
+const mergedTileClass = computed(() =>
+  twMerge(
+    'flex-1 cursor-pointer px-6 py-4 text-center transition-opacity focus:outline-none',
+    props.tileClass,
+  ),
+)
+
+const mergedLabelClass = computed(() =>
+  twMerge(
+    'text-white font-bold uppercase tracking-wide',
+    props.labelClass,
+  ),
+)
+
+function select(id: string) {
+  const site = props.sites.find((s) => s.id === id)
+  if (!site) return
+
+  if (!isControlled.value) {
+    localValue.value = id
+  }
+  emit('update:modelValue', id)
+  emit('change', site)
+}
+</script>