fix(workspace): reset doc state on navigation (bbox / analysis state leak)

Quand l'utilisateur naviguait d'un doc à un autre via /docs/:id, Vue
réutilisait l'instance du composant — onMounted ne se redéclenchait pas,
laissant l'analyse précédente (et donc les bbox du StructureViewer)
visibles tant que le nouveau fetch n'était pas terminé.

- DocWorkspacePage: watch props.id pour recharger le doc + :key sur les
  onglets (forçe un remount propre, reset l'état interne du
  StructureViewer comme selectedPage/hiddenTypes).
- DocInspectTab / DocAskTab: watch props.docId avec immediate:true,
  reset l'état au début du load + guard de race condition (ignore les
  réponses pour un docId obsolète).

frontend/src/pages/DocAskTab.vue

@@ -40,7 +40,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed, onMounted } from 'vue'
+import { ref, computed, watch } from 'vue'
 import { RouterLink } from 'vue-router'
 import type { Analysis, Page } from '../shared/types'
 import { fetchDocumentAnalyses } from '../features/analysis/api'
@@ -73,13 +73,18 @@ const visitedBySelfRef = computed<Map<string, number>>(() => new Map())
 async function loadAnalysis(): Promise<void> {
   loading.value = true
   error.value = null
+  analysis.value = null
+  focusedSelfRef.value = null
+  const requestedId = props.docId
   try {
-    const analyses = await fetchDocumentAnalyses(props.docId)
+    const analyses = await fetchDocumentAnalyses(requestedId)
+    if (requestedId !== props.docId) return
     analysis.value = analyses.find((a) => a.status === 'COMPLETED') ?? null
   } catch (e) {
+    if (requestedId !== props.docId) return
     error.value = (e as Error).message || 'Failed to load analysis'
   } finally {
-    loading.value = false
+    if (requestedId === props.docId) loading.value = false
   }
 }
 
@@ -91,7 +96,7 @@ function onSectionFocus(sectionRef: string): void {
   }
 }
 
-onMounted(loadAnalysis)
+watch(() => props.docId, loadAnalysis, { immediate: true })
 </script>
 
 <style scoped>

frontend/src/pages/DocInspectTab.vue

@@ -26,7 +26,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, onMounted } from 'vue'
+import { ref, watch } from 'vue'
 import { RouterLink } from 'vue-router'
 import type { Analysis } from '../shared/types'
 import { fetchDocumentAnalyses } from '../features/analysis/api'
@@ -45,17 +45,21 @@ const analysis = ref<Analysis | null>(null)
 async function load(): Promise<void> {
   loading.value = true
   error.value = null
+  analysis.value = null
+  const requestedId = props.docId
   try {
-    const analyses = await fetchDocumentAnalyses(props.docId)
+    const analyses = await fetchDocumentAnalyses(requestedId)
+    if (requestedId !== props.docId) return
     analysis.value = analyses.find((a) => a.status === 'COMPLETED') ?? null
   } catch (e) {
+    if (requestedId !== props.docId) return
     error.value = (e as Error).message || 'Failed to load analysis'
   } finally {
-    loading.value = false
+    if (requestedId === props.docId) loading.value = false
   }
 }
 
-onMounted(load)
+watch(() => props.docId, load, { immediate: true })
 </script>
 
 <style scoped>

frontend/src/pages/DocWorkspacePage.vue

@@ -35,16 +35,19 @@
       </div>
 
       <!-- Tab content — lazy loaded (#216) -->
+      <!-- :key on docId forces a clean remount when navigating to a different doc,
+           preventing stale state (bbox, selectedPage, etc.) from leaking. -->
       <div class="tab-content" role="tabpanel" data-e2e="tab-content">
         <Suspense>
           <DocChunksTab
             v-if="activeMode === 'chunks'"
+            :key="id"
             :doc-id="id"
             :available-stores="doc.stores ?? []"
             :store-links="doc.storeLinks"
           />
-          <DocInspectTab v-else-if="activeMode === 'inspect'" :doc-id="id" />
-          <DocAskTab v-else-if="activeMode === 'ask'" :doc-id="id" />
+          <DocInspectTab v-else-if="activeMode === 'inspect'" :key="id" :doc-id="id" />
+          <DocAskTab v-else-if="activeMode === 'ask'" :key="id" :doc-id="id" />
         </Suspense>
       </div>
     </template>
@@ -106,12 +109,17 @@ function switchMode(m: DocMode): void {
 async function loadDoc(): Promise<void> {
   loadingDoc.value = true
   docError.value = null
+  doc.value = null
+  const requestedId = props.id
   try {
-    doc.value = await fetchDocument(props.id)
+    const fetched = await fetchDocument(requestedId)
+    if (requestedId !== props.id) return
+    doc.value = fetched
   } catch (e) {
+    if (requestedId !== props.id) return
     docError.value = (e as Error).message || 'Failed to load document'
   } finally {
-    loadingDoc.value = false
+    if (requestedId === props.id) loadingDoc.value = false
   }
 }
 
@@ -140,6 +148,13 @@ watch(
     if (resolved) activeMode.value = resolved
   },
 )
+
+watch(
+  () => props.id,
+  (newId, oldId) => {
+    if (newId !== oldId) loadDoc()
+  },
+)
 </script>
 
 <style scoped>