fix: component style (#80)

| 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

---------

Co-authored-by: admin malio <malio@yuno.malio.fr>
Co-authored-by: THOLOT DECHENE Matthieu <matthieu@yuno.malio.fr>
Co-authored-by: matthieu <matthieu@yuno.malio.fr>
Reviewed-on: #80
Co-authored-by: tristan <tristan@yuno.malio.fr>
Co-committed-by: tristan <tristan@yuno.malio.fr>

app/components/malio/tab/TabList.vue

@@ -1,5 +1,30 @@
 <template>
-  <div v-bind="$attrs">
+  <div
+    ref="rootRef"
+    v-bind="$attrs"
+  >
+    <!-- Ligne de mesure cachée : largeur réelle de chaque onglet (mêmes classes de
+         layout, placeholder à la place de l'icône pour ne pas fausser les tests),
+         afin de calculer combien d'onglets tiennent. Invisible et hors flux. -->
+    <div
+      ref="measureRef"
+      aria-hidden="true"
+      class="pointer-events-none invisible absolute left-0 top-0 flex"
+    >
+      <span
+        v-for="tab in tabs"
+        :key="tab.key"
+        class="flex items-center gap-[18px] text-[24px] font-[600]"
+      >
+        <span
+          v-if="tab.icon"
+          class="inline-block shrink-0"
+          :style="{ width: `${tab.iconSize ?? 24}px`, height: `${tab.iconSize ?? 24}px` }"
+        />
+        {{ tab.label }}
+      </span>
+    </div>
+
     <div v-if="isWindowed" class="flex items-center justify-center gap-[36px] border-b border-m-primary">
       <button
         type="button"
@@ -20,7 +45,6 @@
       <div
         role="tablist"
         class="flex flex-1 justify-center gap-[60px]"
-        :style="{ maxWidth: `${maxWidth}px` }"
       >
         <button
           v-for="tab in visibleTabs"
@@ -39,7 +63,7 @@
               ? 'cursor-pointer text-m-primary after:content-[\'\'] after:absolute after:-bottom-[3px] after:left-0 after:right-0 after:h-[3px] after:bg-m-primary'
               : tab.disabled
                 ? 'cursor-not-allowed text-m-primary/50'
-                : 'cursor-pointer text-m-primary/50 hover:text-m-primary/70',
+                : 'cursor-pointer text-m-primary/50 hover:text-m-primary hover:after:content-[\'\'] hover:after:absolute hover:after:-bottom-[3px] hover:after:left-0 hover:after:right-0 hover:after:h-[3px] hover:after:bg-m-primary',
           ]"
           @click="selectTab(tab.key)"
         >
@@ -91,7 +115,7 @@
             ? 'cursor-pointer text-m-primary after:content-[\'\'] after:absolute after:-bottom-[3px] after:left-0 after:right-0 after:h-[3px] after:bg-m-primary'
             : tab.disabled
               ? 'cursor-not-allowed text-m-primary/50'
-              : 'cursor-pointer text-m-primary/50 hover:text-m-primary/70',
+              : 'cursor-pointer text-m-primary/50 hover:text-m-primary hover:after:content-[\'\'] hover:after:absolute hover:after:-bottom-[3px] hover:after:left-0 hover:after:right-0 hover:after:h-[3px] hover:after:bg-m-primary',
         ]"
         @click="selectTab(tab.key)"
       >
@@ -119,8 +143,9 @@
 </template>
 
 <script setup lang="ts">
-import {computed, ref, useId, watch} from 'vue'
+import {computed, nextTick, onBeforeUnmount, onMounted, ref, useId, watch} from 'vue'
 import {Icon as IconifyIcon} from '@iconify/vue'
+import {computeVisibleCount} from './tabFit'
 
 defineOptions({name: 'MalioTabList', inheritAttrs: false})
 
@@ -137,12 +162,10 @@ const props = withDefaults(defineProps<{
   modelValue?: string
   id?: string
   maxVisibleTabs?: number
-  maxWidth?: number
 }>(), {
   modelValue: undefined,
   id: '',
   maxVisibleTabs: undefined,
-  maxWidth: 1100,
 })
 
 const emit = defineEmits<{
@@ -159,22 +182,69 @@ const activeTab = computed(() =>
   isControlled.value ? props.modelValue! : localValue.value,
 )
 
-const isWindowed = computed(() =>
-  props.maxVisibleTabs != null && props.tabs.length > props.maxVisibleTabs,
-)
+const TAB_GAP = 60
+const CHEVRON_RESERVE = 110
 
-const maxStartIndex = computed(() =>
-  isWindowed.value ? Math.max(0, props.tabs.length - props.maxVisibleTabs!) : 0,
-)
+const rootRef = ref<HTMLElement | null>(null)
+const measureRef = ref<HTMLElement | null>(null)
+const containerWidth = ref(0)
+const tabWidths = ref<number[]>([])
+
+// Nombre d'onglets affichés, calculé pour qu'ils tiennent dans la largeur réelle
+// (cf. tabFit.ts) — la structure « flèches fixes » est conservée, et comme le
+// nombre est choisi pour tenir, pas de débordement sur les flèches ni de rognage.
+// `maxVisibleTabs` reste un plafond optionnel. Sans mesure (SSR/jsdom), repli sur
+// ce plafond / tous les onglets.
+const visibleCount = computed(() => computeVisibleCount({
+  count: props.tabs.length,
+  containerWidth: containerWidth.value,
+  tabWidths: tabWidths.value,
+  gap: TAB_GAP,
+  chevronReserve: CHEVRON_RESERVE,
+  maxVisibleTabs: props.maxVisibleTabs,
+}))
+
+const isWindowed = computed(() => props.tabs.length > visibleCount.value)
+
+const maxStartIndex = computed(() => Math.max(0, props.tabs.length - visibleCount.value))
 
 const startIndex = ref(0)
 
 const visibleTabs = computed(() =>
   isWindowed.value
-    ? props.tabs.slice(startIndex.value, startIndex.value + props.maxVisibleTabs!)
+    ? props.tabs.slice(startIndex.value, startIndex.value + visibleCount.value)
     : props.tabs,
 )
 
+function measureTabWidths() {
+  const el = measureRef.value
+  if (!el) return
+  tabWidths.value = Array.from(el.children).map(c => (c as HTMLElement).offsetWidth)
+}
+
+function measureContainer() {
+  if (rootRef.value) containerWidth.value = rootRef.value.clientWidth
+}
+
+let resizeObserver: ResizeObserver | null = null
+
+onMounted(() => {
+  measureTabWidths()
+  measureContainer()
+  if (typeof ResizeObserver !== 'undefined' && rootRef.value) {
+    resizeObserver = new ResizeObserver(() => measureContainer())
+    resizeObserver.observe(rootRef.value)
+  }
+})
+
+onBeforeUnmount(() => resizeObserver?.disconnect())
+
+// Re-mesure quand la liste change (labels/icônes → largeurs différentes).
+watch(() => props.tabs, () => nextTick(() => {
+  measureTabWidths()
+  measureContainer()
+}), {deep: true})
+
 const focusedKey = computed(() => {
   if (!isWindowed.value) return activeTab.value
   const inView = visibleTabs.value.some(t => t.key === activeTab.value)